| leapseconds (86222) | leapseconds (86464) |
|---|---|
| 1# @(#)leapseconds 7.14 2 | 1# @(#)leapseconds 7.14 2 |
| 3# $FreeBSD: head/share/zoneinfo/leapseconds 86222 2001-11-09 19:17:59Z wollman $ 4 | |
| 5# Allowance for leapseconds added to each timezone file. 6 7# The International Earth Rotation Service periodically uses leap seconds 8# to keep UTC to within 0.9 s of UT1 9# (which measures the true angular orientation of the earth in space); see 10# Terry J Quinn, The BIPM and the accurate measure of time, 11# Proc IEEE 79, 7 (July 1991), 894-905. 12# There were no leap seconds before 1972, because the official mechanism 13# accounting for the discrepancy between atomic time and the earth's rotation 14# did not exist until the early 1970s. 15 16# The correction (+ or -) is made at the given time, so lines 17# will typically look like: 18# Leap YEAR MON DAY 23:59:60 + R/S 19# or 20# Leap YEAR MON DAY 23:59:59 - R/S 21 22# If the leapsecond is Rolling (R) the given time is local time 23# If the leapsecond is Stationary (S) the given time is UTC 24 25# Leap YEAR MONTH DAY HH:MM:SS CORR R/S 26Leap 1972 Jun 30 23:59:60 + S 27Leap 1972 Dec 31 23:59:60 + S 28Leap 1973 Dec 31 23:59:60 + S 29Leap 1974 Dec 31 23:59:60 + S 30Leap 1975 Dec 31 23:59:60 + S 31Leap 1976 Dec 31 23:59:60 + S 32Leap 1977 Dec 31 23:59:60 + S 33Leap 1978 Dec 31 23:59:60 + S 34Leap 1979 Dec 31 23:59:60 + S 35Leap 1981 Jun 30 23:59:60 + S 36Leap 1982 Jun 30 23:59:60 + S 37Leap 1983 Jun 30 23:59:60 + S 38Leap 1985 Jun 30 23:59:60 + S 39Leap 1987 Dec 31 23:59:60 + S 40Leap 1989 Dec 31 23:59:60 + S 41Leap 1990 Dec 31 23:59:60 + S 42Leap 1992 Jun 30 23:59:60 + S 43Leap 1993 Jun 30 23:59:60 + S 44Leap 1994 Jun 30 23:59:60 + S 45Leap 1995 Dec 31 23:59:60 + S 46Leap 1997 Jun 30 23:59:60 + S 47Leap 1998 Dec 31 23:59:60 + S 48 49# INTERNATIONAL EARTH ROTATION SERVICE (IERS) 50# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE 51# 52# SERVICE DE LA ROTATION TERRESTRE 53# OBSERVATOIRE DE PARIS 54# 61, Av. de l'Observatoire 75014 PARIS (France) 55# Tel. : 33 (0) 1 40 51 22 26 56# FAX : 33 (0) 1 40 51 22 91 57# Internet : iers@obspm.fr 58# 59# Paris, 25 June 2001 60# 61# Bulletin C 22 62# 63# To authorities responsible 64# for the measurement and 65# distribution of time 66# 67# INFORMATION ON UTC - TAI 68# 69# NO positive leap second will be introduced at the end of December 2001. 70# The difference between UTC and the International Atomic Time TAI is : 71# 72# from 1999 January 1, 0h UTC, until further notice : UTC-TAI = -32 s 73# 74# Leap seconds can be introduced in UTC at the end of the months of December 75# or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every 76# six months, either to announce a time step in UTC, or to confirm that there 77# will be no time step at the next possible date. 78# 79# Daniel GAMBIS 80# Director 81# Earth Orientation Center of IERS | 3# Allowance for leapseconds added to each timezone file. 4 5# The International Earth Rotation Service periodically uses leap seconds 6# to keep UTC to within 0.9 s of UT1 7# (which measures the true angular orientation of the earth in space); see 8# Terry J Quinn, The BIPM and the accurate measure of time, 9# Proc IEEE 79, 7 (July 1991), 894-905. 10# There were no leap seconds before 1972, because the official mechanism 11# accounting for the discrepancy between atomic time and the earth's rotation 12# did not exist until the early 1970s. 13 14# The correction (+ or -) is made at the given time, so lines 15# will typically look like: 16# Leap YEAR MON DAY 23:59:60 + R/S 17# or 18# Leap YEAR MON DAY 23:59:59 - R/S 19 20# If the leapsecond is Rolling (R) the given time is local time 21# If the leapsecond is Stationary (S) the given time is UTC 22 23# Leap YEAR MONTH DAY HH:MM:SS CORR R/S 24Leap 1972 Jun 30 23:59:60 + S 25Leap 1972 Dec 31 23:59:60 + S 26Leap 1973 Dec 31 23:59:60 + S 27Leap 1974 Dec 31 23:59:60 + S 28Leap 1975 Dec 31 23:59:60 + S 29Leap 1976 Dec 31 23:59:60 + S 30Leap 1977 Dec 31 23:59:60 + S 31Leap 1978 Dec 31 23:59:60 + S 32Leap 1979 Dec 31 23:59:60 + S 33Leap 1981 Jun 30 23:59:60 + S 34Leap 1982 Jun 30 23:59:60 + S 35Leap 1983 Jun 30 23:59:60 + S 36Leap 1985 Jun 30 23:59:60 + S 37Leap 1987 Dec 31 23:59:60 + S 38Leap 1989 Dec 31 23:59:60 + S 39Leap 1990 Dec 31 23:59:60 + S 40Leap 1992 Jun 30 23:59:60 + S 41Leap 1993 Jun 30 23:59:60 + S 42Leap 1994 Jun 30 23:59:60 + S 43Leap 1995 Dec 31 23:59:60 + S 44Leap 1997 Jun 30 23:59:60 + S 45Leap 1998 Dec 31 23:59:60 + S 46 47# INTERNATIONAL EARTH ROTATION SERVICE (IERS) 48# SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE 49# 50# SERVICE DE LA ROTATION TERRESTRE 51# OBSERVATOIRE DE PARIS 52# 61, Av. de l'Observatoire 75014 PARIS (France) 53# Tel. : 33 (0) 1 40 51 22 26 54# FAX : 33 (0) 1 40 51 22 91 55# Internet : iers@obspm.fr 56# 57# Paris, 25 June 2001 58# 59# Bulletin C 22 60# 61# To authorities responsible 62# for the measurement and 63# distribution of time 64# 65# INFORMATION ON UTC - TAI 66# 67# NO positive leap second will be introduced at the end of December 2001. 68# The difference between UTC and the International Atomic Time TAI is : 69# 70# from 1999 January 1, 0h UTC, until further notice : UTC-TAI = -32 s 71# 72# Leap seconds can be introduced in UTC at the end of the months of December 73# or June, depending on the evolution of UT1-TAI. Bulletin C is mailed every 74# six months, either to announce a time step in UTC, or to confirm that there 75# will be no time step at the next possible date. 76# 77# Daniel GAMBIS 78# Director 79# Earth Orientation Center of IERS |