diff options
Diffstat (limited to 'newtzset.3.txt')
| -rw-r--r-- | newtzset.3.txt | 24 |
1 files changed, 10 insertions, 14 deletions
diff --git a/newtzset.3.txt b/newtzset.3.txt index b0d929948bb8..21c4ae3958d7 100644 --- a/newtzset.3.txt +++ b/newtzset.3.txt @@ -158,22 +158,19 @@ DESCRIPTION <-03>3<-02>,M3.5.0/-2,M10.5.0/-1 stands for time in western Greenland, 3 hours behind UT, where - clocks follow the EU rules of springing forward on March's last + clocks follow the EU rule of springing forward on March's last Sunday at 01:00 UT (-02:00 local time, i.e., 22:00 the previous day) and falling back on October's last Sunday at 01:00 UT (-01:00 local time, i.e., 23:00 the previous day). The abbreviations for standard and daylight saving time are “-03” and “-02”. - If TZ specifies daylight saving time but does not specify a rule, and - the optional tzfile(5)-format file posixrules is present in the system - time conversion information directory, the rules in posixrules are - used, with the posixrules standard and daylight saving time offsets - from UT replaced by those specified by the offset values in TZ. - However, the posixrules file is obsolete: if it is present it is only - for backward compatibility, and it does not work reliably. Therefore, - if a TZ string directly specifies a timezone with daylight saving time, - it should specify the daylight saving rules explicitly. + If TZ specifies daylight saving time but does not specify a rule, the + rule typically defaults to the current US daylight-saving rule, + although such a default is not guaranteed and is incorrect for many + locations outside the US. Therefore, if a TZ string directly specifies + a timezone with daylight saving time, it should specify the daylight + saving rule explicitly. For compatibility with System V Release 3.1, a semicolon (;) may be used to separate the rule from the rest of the specification; this is @@ -214,10 +211,9 @@ ERRORS read(2). FILES - /etc/localtime local timezone file - /usr/share/zoneinfo timezone directory - /usr/share/zoneinfo/posixrules default DST rules (obsolete) - /usr/share/zoneinfo/GMT for UTC leap seconds + /etc/localtime local timezone file + /usr/share/zoneinfo timezone directory + /usr/share/zoneinfo/GMT for UTC leap seconds If /usr/share/zoneinfo/GMT is absent, UTC leap seconds are loaded from /usr/share/zoneinfo/GMT0 if present. |