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			Plaintext
		
	
	
	
	
	
			
		
		
	
	
			83 lines
		
	
	
		
			3.3 KiB
		
	
	
	
		
			Plaintext
		
	
	
	
	
	
| # Allowance for leap seconds added to each time zone file.
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| 
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| # This file is in the public domain.
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| 
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| # This file is generated automatically from the data in the public-domain
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| # NIST format leap-seconds.list file, which can be copied from
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| # <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
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| # or <ftp://ftp.boulder.nist.gov/pub/time/leap-seconds.list>.
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| # The NIST file is used instead of its IERS upstream counterpart
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| # <https://hpiers.obspm.fr/iers/bul/bulc/ntp/leap-seconds.list>
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| # because under US law the NIST file is public domain
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| # whereas the IERS file's copyright and license status is unclear.
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| # For more about leap-seconds.list, please see
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| # The NTP Timescale and Leap Seconds
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| # <https://www.eecis.udel.edu/~mills/leap.html>.
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| 
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| # The rules for leap seconds are specified in Annex 1 (Time scales) of:
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| # Standard-frequency and time-signal emissions.
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| # International Telecommunication Union - Radiocommunication Sector
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| # (ITU-R) Recommendation TF.460-6 (02/2002)
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| # <https://www.itu.int/rec/R-REC-TF.460-6-200202-I/>.
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| # The International Earth Rotation and Reference Systems Service (IERS)
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| # periodically uses leap seconds to keep UTC to within 0.9 s of UT1
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| # (a proxy for Earth's angle in space as measured by astronomers)
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| # and publishes leap second data in a copyrighted file
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| # <https://hpiers.obspm.fr/iers/bul/bulc/Leap_Second.dat>.
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| # See: Levine J. Coordinated Universal Time and the leap second.
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| # URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995
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| # <https://ieeexplore.ieee.org/document/7909995>.
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| 
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| # There were no leap seconds before 1972, as no official mechanism
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| # accounted for the discrepancy between atomic time (TAI) and the earth's
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| # rotation.  The first ("1 Jan 1972") data line in leap-seconds.list
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| # does not denote a leap second; it denotes the start of the current definition
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| # of UTC.
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| 
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| # All leap-seconds are Stationary (S) at the given UTC time.
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| # The correction (+ or -) is made at the given time, so in the unlikely
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| # event of a negative leap second, a line would look like this:
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| # Leap	YEAR	MON	DAY	23:59:59	-	S
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| # Typical lines look like this:
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| # Leap	YEAR	MON	DAY	23:59:60	+	S
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| Leap	1972	Jun	30	23:59:60	+	S
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| Leap	1972	Dec	31	23:59:60	+	S
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| Leap	1973	Dec	31	23:59:60	+	S
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| Leap	1974	Dec	31	23:59:60	+	S
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| Leap	1975	Dec	31	23:59:60	+	S
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| Leap	1976	Dec	31	23:59:60	+	S
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| Leap	1977	Dec	31	23:59:60	+	S
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| Leap	1978	Dec	31	23:59:60	+	S
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| Leap	1979	Dec	31	23:59:60	+	S
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| Leap	1981	Jun	30	23:59:60	+	S
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| Leap	1982	Jun	30	23:59:60	+	S
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| Leap	1983	Jun	30	23:59:60	+	S
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| Leap	1985	Jun	30	23:59:60	+	S
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| Leap	1987	Dec	31	23:59:60	+	S
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| Leap	1989	Dec	31	23:59:60	+	S
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| Leap	1990	Dec	31	23:59:60	+	S
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| Leap	1992	Jun	30	23:59:60	+	S
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| Leap	1993	Jun	30	23:59:60	+	S
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| Leap	1994	Jun	30	23:59:60	+	S
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| Leap	1995	Dec	31	23:59:60	+	S
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| Leap	1997	Jun	30	23:59:60	+	S
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| Leap	1998	Dec	31	23:59:60	+	S
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| Leap	2005	Dec	31	23:59:60	+	S
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| Leap	2008	Dec	31	23:59:60	+	S
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| Leap	2012	Jun	30	23:59:60	+	S
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| Leap	2015	Jun	30	23:59:60	+	S
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| Leap	2016	Dec	31	23:59:60	+	S
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| 
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| # UTC timestamp when this leap second list expires.
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| # Any additional leap seconds will come after this.
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| # This Expires line is commented out for now,
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| # so that pre-2020a zic implementations do not reject this file.
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| #Expires 2023	Dec	28	00:00:00
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| 
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| # POSIX timestamps for the data in this file:
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| #updated 1467936000 (2016-07-08 00:00:00 UTC)
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| #expires 1703721600 (2023-12-28 00:00:00 UTC)
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| 
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| #	Updated through IERS Bulletin C65
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| #	File expires on:  28 December 2023
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