projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 1bd76676 | 1 | # @(#)leapseconds 7.6 |
| 15637ed4 RG |
2 | |
| 3 | # Allowance for leapseconds added to each timezone file. | |
| 4 | ||
| 1bd76676 GW |
5 | # The International Earth Rotation Service periodically uses leap seconds |
| 6 | # to keep UTC to within 0.9 s of TAI (atomic time); see | |
| 7 | # Terry J Quinn, The BIPM and the accurate measure of time, | |
| 8 | # Proc IEEE 79, 7 (July 1991), 894-905. | |
| 9 | # There were no leap seconds before 1972, because the official mechanism | |
| 10 | # accounting for the discrepancy between atomic time and the earth's rotation | |
| 11 | # did not exist until the early 1970s. | |
| 12 | ||
| 15637ed4 RG |
13 | # The correction (+ or -) is made at the given time, so lines |
| 14 | # will typically look like: | |
| 15 | # Leap YEAR MON DAY 23:59:60 + R/S | |
| 16 | # or | |
| 17 | # Leap YEAR MON DAY 23:59:59 - R/S | |
| 18 | ||
| 19 | # If the leapsecond is Rolling (R) the given time is local time | |
| 20 | # If the leapsecond is Stationary (S) the given time is GMT | |
| 21 | ||
| 22 | # Leap YEAR MONTH DAY HH:MM:SS CORR R/S | |
| 23 | Leap 1972 Jun 30 23:59:60 + S | |
| 24 | Leap 1972 Dec 31 23:59:60 + S | |
| 25 | Leap 1973 Dec 31 23:59:60 + S | |
| 26 | Leap 1974 Dec 31 23:59:60 + S | |
| 27 | Leap 1975 Dec 31 23:59:60 + S | |
| 28 | Leap 1976 Dec 31 23:59:60 + S | |
| 29 | Leap 1977 Dec 31 23:59:60 + S | |
| 30 | Leap 1978 Dec 31 23:59:60 + S | |
| 31 | Leap 1979 Dec 31 23:59:60 + S | |
| 32 | Leap 1981 Jun 30 23:59:60 + S | |
| 33 | Leap 1982 Jun 30 23:59:60 + S | |
| 34 | Leap 1983 Jun 30 23:59:60 + S | |
| 35 | Leap 1985 Jun 30 23:59:60 + S | |
| 36 | Leap 1987 Dec 31 23:59:60 + S | |
| 1bd76676 GW |
37 | Leap 1989 Dec 31 23:59:60 + S |
| 38 | Leap 1990 Dec 31 23:59:60 + S | |
| 39 | Leap 1992 Jun 30 23:59:60 + S | |
| 40 | Leap 1993 Jun 30 23:59:60 + S | |
| 982de806 | 41 | Leap 1994 Jun 30 23:59:60 + S |