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SYSTEMD.TIME(7) | systemd.time | SYSTEMD.TIME(7) |
NAME¶
systemd.time - Time and date specificationsDESCRIPTION¶
In systemd timestamps, timespans, and calendar events are displayed and may be specified in closely related syntaxes.DISPLAYING TIMESPANS¶
Timespans refer to time durations. On display systemd will present timespans as a space separated series of time values each suffixed by a time unit.2h 30min
PARSING TIMESPANS¶
When parsing systemd will accept the same timespan syntax. Separating spaces may be omitted. The following time units are understood:•usec, us
•msec, ms
•seconds, second, sec, s
•minutes, minute, min, m
•hours, hour, hr, h
•days, day, d
•weeks, week, w
•months, month
•years, year, y
If no time unit is specified, generally seconds are assumed, but some exceptions
exist and are marked as such. In a few cases ns, nsec is accepted too, where
the granularity of the timespan allows for this.
Examples for valid timespan specifications:
2 h 2hours 48hr 1y 12month 55s500ms 300ms20s 5day
DISPLAYING TIMESTAMPS¶
Timestamps refer to specific, unique points in time. On display systemd will format these in the local timezone as follows:Fri 2012-11-23 23:02:15 CET
PARSING TIMESTAMPS¶
When parsing systemd will accept a similar timestamp syntax, but excluding any timezone specification (this limitation might be removed eventually). The week day specification is optional, but when the week day is specified it must either be in the abbreviated (Wed) or non-abbreviated (Wednesday) english language form (case doesn't matter), and is not subject to the locale choice of the user. Either the date, or the time part may be omitted, in which case the current date or 00:00:00, resp., is assumed. The seconds component of the time may also be omitted, in which case ":00" is assumed. Year numbers may be specified in full or may be abbreviated (omitting the century). A timestamp is considered invalid if a week day is specified and the date does not actually match the specified day of the week. When parsing systemd will also accept a few special placeholders instead of timestamps: now may be used to refer to the current time (or of the invocation of the command that is currently executed). today, yesterday, tomorrow refer to 00:00:00 of the current day, the day before or the next day, respectively. When parsing systemd will also accept relative time specifications. A timespan (see above) that is prefixed with + is evaluated to the current time plus the specified timespan. Correspondingly a timespan that is prefix with - is evaluated to the current time minus the specified timespan. Instead of prefixing the timespan with - it may also be suffixed with a space and the word ago. Examples for valid timestamps and their normalized form (assuming the current time was 2012-11-23 18:15:22):Fri 2012-11-23 11:12:13 → Fri 2012-11-23 11:12:13 2012-11-23 11:12:13 → Fri 2012-11-23 11:12:13 2012-11-23 → Fri 2012-11-23 00:00:00 12-11-23 → Fri 2012-11-23 00:00:00 11:12:13 → Fri 2012-11-23 11:12:13 11:12 → Fri 2012-11-23 11:12:00 now → Fri 2012-11-23 18:15:22 today → Fri 2012-11-23 00:00:00 yesterday → Fri 2012-11-22 00:00:00 tomorrow → Fri 2012-11-24 00:00:00 +3h30min → Fri 2012-11-23 21:45:22 -5s → Fri 2012-11-23 18:15:17 11min ago → Fri 2012-11-23 18:04:22
CALENDAR EVENTS¶
Calendar events may be used to refer to one or more points in time in a single expression. They form a superset of the absolute timestamps explained above:Thu,Fri 2012-*-1,5 11:12:13
Sat,Thu,Mon-Wed,Sat-Sun → Mon-Thu,Sat,Sun *-*-* 00:00:00 Mon,Sun 12-*-* 2,1:23 → Mon,Sun 2012-*-* 01,02:23:00 Wed *-1 → Wed *-*-01 00:00:00 Wed-Wed,Wed *-1 → Wed *-*-01 00:00:00 Wed, 17:48 → Wed *-*-* 17:48:00 Wed-Sat,Tue 12-10-15 1:2:3 → Tue-Sat 2012-10-15 01:02:03 *-*-7 0:0:0 → *-*-07 00:00:00 10-15 → *-10-15 00:00:00 monday *-12-* 17:00 → Mon *-12-* 17:00:00 Mon,Fri *-*-3,1,2 *:30:45 → Mon,Fri *-*-01,02,03 *:30:45 12,14,13,12:20,10,30 → *-*-* 12,13,14:10,20,30:00 mon,fri *-1/2-1,3 *:30:45 → Mon,Fri *-01/2-01,03 *:30:45 03-05 08:05:40 → *-03-05 08:05:40 08:05:40 → *-*-* 08:05:40 05:40 → *-*-* 05:40:00 Sat,Sun 12-05 08:05:40 → Sat,Sun *-12-05 08:05:40 Sat,Sun 08:05:40 → Sat,Sun *-*-* 08:05:40 2003-03-05 05:40 → 2003-03-05 05:40:00 2003-03-05 → 2003-03-05 00:00:00 03-05 → *-03-05 00:00:00 hourly → *-*-* *:00:00 daily → *-*-* 00:00:00 monthly → *-*-01 00:00:00 weekly → Mon *-*-* 00:00:00 *:2/3 → *-*-* *:02/3:00
SEE ALSO¶
systemd 204 |