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705 lines
25 KiB
705 lines
25 KiB
1 year ago
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"""Strptime-related classes and functions.
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TimeRE, _calc_julian_from_U_or_W are vendored
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from the standard library, see
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https://github.com/python/cpython/blob/main/Lib/_strptime.py
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The original module-level docstring follows.
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Strptime-related classes and functions.
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CLASSES:
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LocaleTime -- Discovers and stores locale-specific time information
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TimeRE -- Creates regexes for pattern matching a string of text containing
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time information
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FUNCTIONS:
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_getlang -- Figure out what language is being used for the locale
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strptime -- Calculates the time struct represented by the passed-in string
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"""
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from datetime import timezone
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from cpython.datetime cimport (
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PyDate_Check,
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PyDateTime_Check,
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date,
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import_datetime,
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timedelta,
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tzinfo,
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)
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from _strptime import (
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TimeRE as _TimeRE,
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_getlang,
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)
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from _strptime import LocaleTime # no-cython-lint
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import_datetime()
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from _thread import allocate_lock as _thread_allocate_lock
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import re
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import numpy as np
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import pytz
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cimport numpy as cnp
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from numpy cimport (
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int64_t,
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ndarray,
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)
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from pandas._libs.missing cimport checknull_with_nat_and_na
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from pandas._libs.tslibs.conversion cimport (
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convert_timezone,
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get_datetime64_nanos,
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)
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from pandas._libs.tslibs.nattype cimport (
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NPY_NAT,
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c_nat_strings as nat_strings,
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)
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from pandas._libs.tslibs.np_datetime cimport (
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NPY_DATETIMEUNIT,
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NPY_FR_ns,
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check_dts_bounds,
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import_pandas_datetime,
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npy_datetimestruct,
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npy_datetimestruct_to_datetime,
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pydate_to_dt64,
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pydatetime_to_dt64,
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string_to_dts,
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)
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import_pandas_datetime()
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from pandas._libs.tslibs.np_datetime import OutOfBoundsDatetime
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from pandas._libs.tslibs.timestamps cimport _Timestamp
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from pandas._libs.util cimport (
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is_datetime64_object,
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is_float_object,
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is_integer_object,
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)
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from pandas._libs.tslibs.timestamps import Timestamp
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cnp.import_array()
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cdef bint format_is_iso(f: str):
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"""
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Does format match the iso8601 set that can be handled by the C parser?
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Generally of form YYYY-MM-DDTHH:MM:SS - date separator can be different
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but must be consistent. Leading 0s in dates and times are optional.
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"""
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iso_regex = re.compile(
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r"""
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^ # start of string
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%Y # Year
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(?:([-/ \\.]?)%m # month with or without separators
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(?: \1%d # day with same separator as for year-month
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(?:[ T]%H # hour with separator
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(?:\:%M # minute with separator
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(?:\:%S # second with separator
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(?:%z|\.%f(?:%z)? # timezone or fractional second
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)?)?)?)?)?)? # optional
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$ # end of string
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""",
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re.VERBOSE,
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)
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excluded_formats = ["%Y%m"]
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return re.match(iso_regex, f) is not None and f not in excluded_formats
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def _test_format_is_iso(f: str) -> bool:
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"""Only used in testing."""
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return format_is_iso(f)
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cdef bint parse_today_now(str val, int64_t* iresult, bint utc):
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# We delay this check for as long as possible
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# because it catches relatively rare cases
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# Multiply by 1000 to convert to nanos, since these methods naturally have
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# microsecond resolution
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if val == "now":
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if utc:
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iresult[0] = Timestamp.utcnow()._value * 1000
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else:
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# GH#18705 make sure to_datetime("now") matches Timestamp("now")
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# Note using Timestamp.now() is faster than Timestamp("now")
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iresult[0] = Timestamp.now()._value * 1000
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return True
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elif val == "today":
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iresult[0] = Timestamp.today()._value * 1000
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return True
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return False
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cdef dict _parse_code_table = {"y": 0,
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"Y": 1,
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"m": 2,
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"B": 3,
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"b": 4,
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"d": 5,
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"H": 6,
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"I": 7,
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"M": 8,
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"S": 9,
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"f": 10,
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"A": 11,
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"a": 12,
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"w": 13,
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"j": 14,
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"U": 15,
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"W": 16,
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"Z": 17,
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"p": 18, # an additional key, only with I
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"z": 19,
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"G": 20,
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"V": 21,
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"u": 22}
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def array_strptime(
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ndarray[object] values,
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str fmt,
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bint exact=True,
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errors="raise",
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bint utc=False,
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):
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"""
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Calculates the datetime structs represented by the passed array of strings
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Parameters
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----------
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values : ndarray of string-like objects
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fmt : string-like regex
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exact : matches must be exact if True, search if False
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errors : string specifying error handling, {'raise', 'ignore', 'coerce'}
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"""
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cdef:
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Py_ssize_t i, n = len(values)
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npy_datetimestruct dts
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int64_t[::1] iresult
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object[::1] result_timezone
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int year, month, day, minute, hour, second, weekday, julian
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int week_of_year, week_of_year_start, parse_code, ordinal
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int iso_week, iso_year
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int64_t us, ns
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object val, group_key, ampm, found, tz
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bint is_raise = errors=="raise"
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bint is_ignore = errors=="ignore"
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bint is_coerce = errors=="coerce"
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bint found_naive = False
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bint found_tz = False
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tzinfo tz_out = None
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bint iso_format = format_is_iso(fmt)
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NPY_DATETIMEUNIT out_bestunit
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int out_local = 0, out_tzoffset = 0
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bint string_to_dts_succeeded = 0
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assert is_raise or is_ignore or is_coerce
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if "%W" in fmt or "%U" in fmt:
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if "%Y" not in fmt and "%y" not in fmt:
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raise ValueError("Cannot use '%W' or '%U' without day and year")
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if "%A" not in fmt and "%a" not in fmt and "%w" not in fmt:
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raise ValueError("Cannot use '%W' or '%U' without day and year")
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elif "%Z" in fmt and "%z" in fmt:
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raise ValueError("Cannot parse both %Z and %z")
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elif "%j" in fmt and "%G" in fmt:
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raise ValueError("Day of the year directive '%j' is not "
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"compatible with ISO year directive '%G'. "
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"Use '%Y' instead.")
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elif "%G" in fmt and (
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"%V" not in fmt
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or not (
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"%A" in fmt
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or "%a" in fmt
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or "%w" in fmt
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or "%u" in fmt
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)
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):
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raise ValueError("ISO year directive '%G' must be used with "
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"the ISO week directive '%V' and a weekday "
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"directive '%A', '%a', '%w', or '%u'.")
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elif "%V" in fmt and "%Y" in fmt:
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raise ValueError("ISO week directive '%V' is incompatible with "
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"the year directive '%Y'. Use the ISO year "
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"'%G' instead.")
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elif "%V" in fmt and (
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"%G" not in fmt
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or not (
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"%A" in fmt
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or "%a" in fmt
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or "%w" in fmt
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or "%u" in fmt
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)
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):
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raise ValueError("ISO week directive '%V' must be used with "
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"the ISO year directive '%G' and a weekday "
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"directive '%A', '%a', '%w', or '%u'.")
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global _TimeRE_cache, _regex_cache
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with _cache_lock:
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if _getlang() != _TimeRE_cache.locale_time.lang:
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_TimeRE_cache = TimeRE()
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_regex_cache.clear()
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if len(_regex_cache) > _CACHE_MAX_SIZE:
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_regex_cache.clear()
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locale_time = _TimeRE_cache.locale_time
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format_regex = _regex_cache.get(fmt)
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if not format_regex:
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try:
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format_regex = _TimeRE_cache.compile(fmt)
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# KeyError raised when a bad format is found; can be specified as
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# \\, in which case it was a stray % but with a space after it
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except KeyError, err:
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bad_directive = err.args[0]
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if bad_directive == "\\":
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bad_directive = "%"
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del err
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raise ValueError(f"'{bad_directive}' is a bad directive "
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f"in format '{fmt}'")
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# IndexError only occurs when the format string is "%"
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except IndexError:
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raise ValueError(f"stray % in format '{fmt}'")
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_regex_cache[fmt] = format_regex
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result = np.empty(n, dtype="M8[ns]")
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iresult = result.view("i8")
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result_timezone = np.empty(n, dtype="object")
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dts.us = dts.ps = dts.as = 0
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for i in range(n):
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val = values[i]
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try:
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if isinstance(val, str):
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if len(val) == 0 or val in nat_strings:
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iresult[i] = NPY_NAT
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continue
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elif checknull_with_nat_and_na(val):
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iresult[i] = NPY_NAT
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continue
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elif PyDateTime_Check(val):
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if val.tzinfo is not None:
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found_tz = True
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else:
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found_naive = True
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tz_out = convert_timezone(
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val.tzinfo,
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tz_out,
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found_naive,
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found_tz,
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utc,
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)
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if isinstance(val, _Timestamp):
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iresult[i] = val.tz_localize(None).as_unit("ns")._value
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else:
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iresult[i] = pydatetime_to_dt64(val.replace(tzinfo=None), &dts)
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check_dts_bounds(&dts)
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result_timezone[i] = val.tzinfo
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continue
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elif PyDate_Check(val):
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iresult[i] = pydate_to_dt64(val, &dts)
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check_dts_bounds(&dts)
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continue
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elif is_datetime64_object(val):
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iresult[i] = get_datetime64_nanos(val, NPY_FR_ns)
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continue
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elif (
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(is_integer_object(val) or is_float_object(val))
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and (val != val or val == NPY_NAT)
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):
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iresult[i] = NPY_NAT
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continue
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else:
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val = str(val)
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if fmt == "ISO8601":
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string_to_dts_succeeded = not string_to_dts(
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val, &dts, &out_bestunit, &out_local,
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&out_tzoffset, False, None, False
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)
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elif iso_format:
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string_to_dts_succeeded = not string_to_dts(
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val, &dts, &out_bestunit, &out_local,
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&out_tzoffset, False, fmt, exact
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)
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if string_to_dts_succeeded:
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# No error reported by string_to_dts, pick back up
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# where we left off
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value = npy_datetimestruct_to_datetime(NPY_FR_ns, &dts)
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if out_local == 1:
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# Store the out_tzoffset in seconds
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# since we store the total_seconds of
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# dateutil.tz.tzoffset objects
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tz = timezone(timedelta(minutes=out_tzoffset))
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result_timezone[i] = tz
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out_local = 0
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out_tzoffset = 0
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iresult[i] = value
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check_dts_bounds(&dts)
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continue
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if parse_today_now(val, &iresult[i], utc):
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continue
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# Some ISO formats can't be parsed by string_to_dts
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# For example, 6-digit YYYYMD. So, if there's an error, and a format
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# was specified, then try the string-matching code below. If the format
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# specified was 'ISO8601', then we need to error, because
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# only string_to_dts handles mixed ISO8601 formats.
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if not string_to_dts_succeeded and fmt == "ISO8601":
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raise ValueError(f"Time data {val} is not ISO8601 format")
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# exact matching
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if exact:
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found = format_regex.match(val)
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if not found:
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raise ValueError(
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f"time data \"{val}\" doesn't match format \"{fmt}\""
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)
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if len(val) != found.end():
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raise ValueError(
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"unconverted data remains when parsing with "
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f"format \"{fmt}\": \"{val[found.end():]}\""
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)
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# search
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else:
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found = format_regex.search(val)
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if not found:
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raise ValueError(
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f"time data \"{val}\" doesn't match format \"{fmt}\""
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)
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iso_year = -1
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year = 1900
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month = day = 1
|
||
|
|
hour = minute = second = ns = us = 0
|
||
|
|
tz = None
|
||
|
|
# Default to -1 to signify that values not known; not critical to have,
|
||
|
|
# though
|
||
|
|
iso_week = week_of_year = -1
|
||
|
|
week_of_year_start = -1
|
||
|
|
# weekday and julian defaulted to -1 so as to signal need to calculate
|
||
|
|
# values
|
||
|
|
weekday = julian = -1
|
||
|
|
found_dict = found.groupdict()
|
||
|
|
for group_key in found_dict.iterkeys():
|
||
|
|
# Directives not explicitly handled below:
|
||
|
|
# c, x, X
|
||
|
|
# handled by making out of other directives
|
||
|
|
# U, W
|
||
|
|
# worthless without day of the week
|
||
|
|
parse_code = _parse_code_table[group_key]
|
||
|
|
|
||
|
|
if parse_code == 0:
|
||
|
|
year = int(found_dict["y"])
|
||
|
|
# Open Group specification for strptime() states that a %y
|
||
|
|
# value in the range of [00, 68] is in the century 2000, while
|
||
|
|
# [69,99] is in the century 1900
|
||
|
|
if year <= 68:
|
||
|
|
year += 2000
|
||
|
|
else:
|
||
|
|
year += 1900
|
||
|
|
elif parse_code == 1:
|
||
|
|
year = int(found_dict["Y"])
|
||
|
|
elif parse_code == 2:
|
||
|
|
month = int(found_dict["m"])
|
||
|
|
# elif group_key == 'B':
|
||
|
|
elif parse_code == 3:
|
||
|
|
month = locale_time.f_month.index(found_dict["B"].lower())
|
||
|
|
# elif group_key == 'b':
|
||
|
|
elif parse_code == 4:
|
||
|
|
month = locale_time.a_month.index(found_dict["b"].lower())
|
||
|
|
# elif group_key == 'd':
|
||
|
|
elif parse_code == 5:
|
||
|
|
day = int(found_dict["d"])
|
||
|
|
# elif group_key == 'H':
|
||
|
|
elif parse_code == 6:
|
||
|
|
hour = int(found_dict["H"])
|
||
|
|
elif parse_code == 7:
|
||
|
|
hour = int(found_dict["I"])
|
||
|
|
ampm = found_dict.get("p", "").lower()
|
||
|
|
# If there was no AM/PM indicator, we'll treat this like AM
|
||
|
|
if ampm in ("", locale_time.am_pm[0]):
|
||
|
|
# We're in AM so the hour is correct unless we're
|
||
|
|
# looking at 12 midnight.
|
||
|
|
# 12 midnight == 12 AM == hour 0
|
||
|
|
if hour == 12:
|
||
|
|
hour = 0
|
||
|
|
elif ampm == locale_time.am_pm[1]:
|
||
|
|
# We're in PM so we need to add 12 to the hour unless
|
||
|
|
# we're looking at 12 noon.
|
||
|
|
# 12 noon == 12 PM == hour 12
|
||
|
|
if hour != 12:
|
||
|
|
hour += 12
|
||
|
|
elif parse_code == 8:
|
||
|
|
minute = int(found_dict["M"])
|
||
|
|
elif parse_code == 9:
|
||
|
|
second = int(found_dict["S"])
|
||
|
|
elif parse_code == 10:
|
||
|
|
s = found_dict["f"]
|
||
|
|
# Pad to always return nanoseconds
|
||
|
|
s += "0" * (9 - len(s))
|
||
|
|
us = long(s)
|
||
|
|
ns = us % 1000
|
||
|
|
us = us // 1000
|
||
|
|
elif parse_code == 11:
|
||
|
|
weekday = locale_time.f_weekday.index(found_dict["A"].lower())
|
||
|
|
elif parse_code == 12:
|
||
|
|
weekday = locale_time.a_weekday.index(found_dict["a"].lower())
|
||
|
|
elif parse_code == 13:
|
||
|
|
weekday = int(found_dict["w"])
|
||
|
|
if weekday == 0:
|
||
|
|
weekday = 6
|
||
|
|
else:
|
||
|
|
weekday -= 1
|
||
|
|
elif parse_code == 14:
|
||
|
|
julian = int(found_dict["j"])
|
||
|
|
elif parse_code == 15 or parse_code == 16:
|
||
|
|
week_of_year = int(found_dict[group_key])
|
||
|
|
if group_key == "U":
|
||
|
|
# U starts week on Sunday.
|
||
|
|
week_of_year_start = 6
|
||
|
|
else:
|
||
|
|
# W starts week on Monday.
|
||
|
|
week_of_year_start = 0
|
||
|
|
elif parse_code == 17:
|
||
|
|
tz = pytz.timezone(found_dict["Z"])
|
||
|
|
elif parse_code == 19:
|
||
|
|
tz = parse_timezone_directive(found_dict["z"])
|
||
|
|
elif parse_code == 20:
|
||
|
|
iso_year = int(found_dict["G"])
|
||
|
|
elif parse_code == 21:
|
||
|
|
iso_week = int(found_dict["V"])
|
||
|
|
elif parse_code == 22:
|
||
|
|
weekday = int(found_dict["u"])
|
||
|
|
weekday -= 1
|
||
|
|
|
||
|
|
# If we know the wk of the year and what day of that wk, we can figure
|
||
|
|
# out the Julian day of the year.
|
||
|
|
if julian == -1 and weekday != -1:
|
||
|
|
if week_of_year != -1:
|
||
|
|
week_starts_Mon = week_of_year_start == 0
|
||
|
|
julian = _calc_julian_from_U_or_W(year, week_of_year, weekday,
|
||
|
|
week_starts_Mon)
|
||
|
|
elif iso_year != -1 and iso_week != -1:
|
||
|
|
year, julian = _calc_julian_from_V(iso_year, iso_week,
|
||
|
|
weekday + 1)
|
||
|
|
# Cannot pre-calculate date() since can change in Julian
|
||
|
|
# calculation and thus could have different value for the day of the wk
|
||
|
|
# calculation.
|
||
|
|
if julian == -1:
|
||
|
|
# Need to add 1 to result since first day of the year is 1, not
|
||
|
|
# 0.
|
||
|
|
ordinal = date(year, month, day).toordinal()
|
||
|
|
julian = ordinal - date(year, 1, 1).toordinal() + 1
|
||
|
|
else:
|
||
|
|
# Assume that if they bothered to include Julian day it will
|
||
|
|
# be accurate.
|
||
|
|
datetime_result = date.fromordinal(
|
||
|
|
(julian - 1) + date(year, 1, 1).toordinal())
|
||
|
|
year = datetime_result.year
|
||
|
|
month = datetime_result.month
|
||
|
|
day = datetime_result.day
|
||
|
|
if weekday == -1:
|
||
|
|
weekday = date(year, month, day).weekday()
|
||
|
|
|
||
|
|
dts.year = year
|
||
|
|
dts.month = month
|
||
|
|
dts.day = day
|
||
|
|
dts.hour = hour
|
||
|
|
dts.min = minute
|
||
|
|
dts.sec = second
|
||
|
|
dts.us = us
|
||
|
|
dts.ps = ns * 1000
|
||
|
|
|
||
|
|
iresult[i] = npy_datetimestruct_to_datetime(NPY_FR_ns, &dts)
|
||
|
|
check_dts_bounds(&dts)
|
||
|
|
|
||
|
|
result_timezone[i] = tz
|
||
|
|
|
||
|
|
except (ValueError, OutOfBoundsDatetime) as ex:
|
||
|
|
ex.args = (
|
||
|
|
f"{str(ex)}, at position {i}. You might want to try:\n"
|
||
|
|
" - passing `format` if your strings have a consistent format;\n"
|
||
|
|
" - passing `format='ISO8601'` if your strings are "
|
||
|
|
"all ISO8601 but not necessarily in exactly the same format;\n"
|
||
|
|
" - passing `format='mixed'`, and the format will be "
|
||
|
|
"inferred for each element individually. "
|
||
|
|
"You might want to use `dayfirst` alongside this.",
|
||
|
|
)
|
||
|
|
if is_coerce:
|
||
|
|
iresult[i] = NPY_NAT
|
||
|
|
continue
|
||
|
|
elif is_raise:
|
||
|
|
raise
|
||
|
|
return values, []
|
||
|
|
|
||
|
|
return result, result_timezone.base
|
||
|
|
|
||
|
|
|
||
|
|
class TimeRE(_TimeRE):
|
||
|
|
"""
|
||
|
|
Handle conversion from format directives to regexes.
|
||
|
|
|
||
|
|
Creates regexes for pattern matching a string of text containing
|
||
|
|
time information
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, locale_time=None):
|
||
|
|
"""
|
||
|
|
Create keys/values.
|
||
|
|
|
||
|
|
Order of execution is important for dependency reasons.
|
||
|
|
"""
|
||
|
|
self._Z = None
|
||
|
|
super().__init__(locale_time=locale_time)
|
||
|
|
# GH 48767: Overrides for cpython's TimeRE
|
||
|
|
# 1) Parse up to nanos instead of micros
|
||
|
|
self.update({"f": r"(?P<f>[0-9]{1,9})"}),
|
||
|
|
|
||
|
|
def __getitem__(self, key):
|
||
|
|
if key == "Z":
|
||
|
|
# lazy computation
|
||
|
|
if self._Z is None:
|
||
|
|
self._Z = self.__seqToRE(pytz.all_timezones, "Z")
|
||
|
|
# Note: handling Z is the key difference vs using the stdlib
|
||
|
|
# _strptime.TimeRE. test_to_datetime_parse_tzname_or_tzoffset with
|
||
|
|
# fmt='%Y-%m-%d %H:%M:%S %Z' fails with the stdlib version.
|
||
|
|
return self._Z
|
||
|
|
return super().__getitem__(key)
|
||
|
|
|
||
|
|
|
||
|
|
_cache_lock = _thread_allocate_lock()
|
||
|
|
# DO NOT modify _TimeRE_cache or _regex_cache without acquiring the cache lock
|
||
|
|
# first!
|
||
|
|
_TimeRE_cache = TimeRE()
|
||
|
|
_CACHE_MAX_SIZE = 5 # Max number of regexes stored in _regex_cache
|
||
|
|
_regex_cache = {}
|
||
|
|
|
||
|
|
|
||
|
|
cdef int _calc_julian_from_U_or_W(int year, int week_of_year,
|
||
|
|
int day_of_week, int week_starts_Mon):
|
||
|
|
"""
|
||
|
|
Calculate the Julian day based on the year, week of the year, and day of
|
||
|
|
the week, with week_start_day representing whether the week of the year
|
||
|
|
assumes the week starts on Sunday or Monday (6 or 0).
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
year : int
|
||
|
|
the year
|
||
|
|
week_of_year : int
|
||
|
|
week taken from format U or W
|
||
|
|
week_starts_Mon : int
|
||
|
|
represents whether the week of the year
|
||
|
|
assumes the week starts on Sunday or Monday (6 or 0)
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
int
|
||
|
|
converted julian day
|
||
|
|
"""
|
||
|
|
|
||
|
|
cdef:
|
||
|
|
int first_weekday, week_0_length, days_to_week
|
||
|
|
|
||
|
|
first_weekday = date(year, 1, 1).weekday()
|
||
|
|
# If we are dealing with the %U directive (week starts on Sunday), it's
|
||
|
|
# easier to just shift the view to Sunday being the first day of the
|
||
|
|
# week.
|
||
|
|
if not week_starts_Mon:
|
||
|
|
first_weekday = (first_weekday + 1) % 7
|
||
|
|
day_of_week = (day_of_week + 1) % 7
|
||
|
|
|
||
|
|
# Need to watch out for a week 0 (when the first day of the year is not
|
||
|
|
# the same as that specified by %U or %W).
|
||
|
|
week_0_length = (7 - first_weekday) % 7
|
||
|
|
if week_of_year == 0:
|
||
|
|
return 1 + day_of_week - first_weekday
|
||
|
|
else:
|
||
|
|
days_to_week = week_0_length + (7 * (week_of_year - 1))
|
||
|
|
return 1 + days_to_week + day_of_week
|
||
|
|
|
||
|
|
|
||
|
|
cdef (int, int) _calc_julian_from_V(int iso_year, int iso_week, int iso_weekday):
|
||
|
|
"""
|
||
|
|
Calculate the Julian day based on the ISO 8601 year, week, and weekday.
|
||
|
|
|
||
|
|
ISO weeks start on Mondays, with week 01 being the week containing 4 Jan.
|
||
|
|
ISO week days range from 1 (Monday) to 7 (Sunday).
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
iso_year : int
|
||
|
|
the year taken from format %G
|
||
|
|
iso_week : int
|
||
|
|
the week taken from format %V
|
||
|
|
iso_weekday : int
|
||
|
|
weekday taken from format %u
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
(int, int)
|
||
|
|
the iso year and the Gregorian ordinal date / julian date
|
||
|
|
"""
|
||
|
|
|
||
|
|
cdef:
|
||
|
|
int correction, ordinal
|
||
|
|
|
||
|
|
correction = date(iso_year, 1, 4).isoweekday() + 3
|
||
|
|
ordinal = (iso_week * 7) + iso_weekday - correction
|
||
|
|
# ordinal may be negative or 0 now, which means the date is in the previous
|
||
|
|
# calendar year
|
||
|
|
if ordinal < 1:
|
||
|
|
ordinal += date(iso_year, 1, 1).toordinal()
|
||
|
|
iso_year -= 1
|
||
|
|
ordinal -= date(iso_year, 1, 1).toordinal()
|
||
|
|
return iso_year, ordinal
|
||
|
|
|
||
|
|
|
||
|
|
cdef tzinfo parse_timezone_directive(str z):
|
||
|
|
"""
|
||
|
|
Parse the '%z' directive and return a datetime.timezone object.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
z : string of the UTC offset
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
datetime.timezone
|
||
|
|
|
||
|
|
Notes
|
||
|
|
-----
|
||
|
|
This is essentially similar to the cpython implementation
|
||
|
|
https://github.com/python/cpython/blob/master/Lib/_strptime.py#L457-L479
|
||
|
|
"""
|
||
|
|
|
||
|
|
cdef:
|
||
|
|
int hours, minutes, seconds, pad_number, microseconds
|
||
|
|
int total_minutes
|
||
|
|
object gmtoff_remainder, gmtoff_remainder_padding
|
||
|
|
|
||
|
|
if z == "Z":
|
||
|
|
return timezone(timedelta(0))
|
||
|
|
if z[3] == ":":
|
||
|
|
z = z[:3] + z[4:]
|
||
|
|
if len(z) > 5:
|
||
|
|
if z[5] != ":":
|
||
|
|
raise ValueError(f"Inconsistent use of : in {z}")
|
||
|
|
z = z[:5] + z[6:]
|
||
|
|
hours = int(z[1:3])
|
||
|
|
minutes = int(z[3:5])
|
||
|
|
seconds = int(z[5:7] or 0)
|
||
|
|
|
||
|
|
# Pad to always return microseconds.
|
||
|
|
gmtoff_remainder = z[8:]
|
||
|
|
pad_number = 6 - len(gmtoff_remainder)
|
||
|
|
gmtoff_remainder_padding = "0" * pad_number
|
||
|
|
microseconds = int(gmtoff_remainder + gmtoff_remainder_padding)
|
||
|
|
|
||
|
|
total_minutes = ((hours * 60) + minutes + (seconds // 60) +
|
||
|
|
(microseconds // 60_000_000))
|
||
|
|
total_minutes = -total_minutes if z.startswith("-") else total_minutes
|
||
|
|
return timezone(timedelta(minutes=total_minutes))
|