diff options
Diffstat (limited to 'tzfile.h')
| -rw-r--r-- | tzfile.h | 8 |
1 files changed, 5 insertions, 3 deletions
@@ -76,14 +76,16 @@ struct tzhead { ** If tzh_version is '2' or greater, the above is followed by a second instance ** of tzhead and a second instance of the data in which each coded transition ** time uses 8 rather than 4 chars, -** then a POSIX-TZ-environment-variable-style string for use in handling +** then a POSIX.1-2017 proleptic TZ string for use in handling ** instants after the last transition time stored in the file ** (with nothing between the newlines if there is no POSIX.1-2017 ** representation for such instants). ** -** If tz_version is '3' or greater, the above is extended as follows. +** If tz_version is '3' or greater, the TZ string can be any POSIX.1-2024 +** proleptic TZ string, which means the above is extended as follows. ** First, the TZ string's hour offset may range from -167 -** through 167 as compared to the POSIX-required 0 through 24. +** through 167 as compared to the range 0 through 24 required +** by POSIX.1-2017 and earlier. ** Second, its DST start time may be January 1 at 00:00 and its stop ** time December 31 at 24:00 plus the difference between DST and ** standard time, indicating DST all year. |