<refsect1>
<title>Displaying Time Spans</title>
- <para>Time spans refer to time durations. On display, systemd will
- present time spans as a space-separated series of time values each
- suffixed by a time unit.</para>
+ <para>Time spans refer to time durations. On display, systemd will present time spans as a space-separated series
+ of time values each suffixed by a time unit. Example:</para>
<programlisting>2h 30min</programlisting>
- <para>All specified time values are meant to be added up. The
- above hence refers to 150 minutes.</para>
+ <para>All specified time values are meant to be added up. The above hence refers to 150 minutes. Display is
+ locale-independent, only English names for the time units are used.</para>
</refsect1>
<refsect1>
<listitem><para>days, day, d</para></listitem>
<listitem><para>weeks, week, w</para></listitem>
<listitem><para>months, month, M (defined as 30.44 days)</para></listitem>
- <listitem><para>years, year, y (define as 365.25 days)</para></listitem>
+ <listitem><para>years, year, y (defined as 365.25 days)</para></listitem>
</itemizedlist>
- <para>If no time unit is specified, generally seconds are assumed,
- but some exceptions exist and are marked as such. In a few cases
- <literal>ns</literal>, <literal>nsec</literal> is accepted too,
- where the granularity of the time span allows for this.</para>
+ <para>If no time unit is specified, generally seconds are assumed, but some exceptions exist and are marked as
+ such. In a few cases <literal>ns</literal>, <literal>nsec</literal> is accepted too, where the granularity of the
+ time span permits this. Parsing is generally locale-independent, non-English names for the time units are not
+ accepted.</para>
<para>Examples for valid time span specifications:</para>
<programlisting>Fri 2012-11-23 23:02:15 CET</programlisting>
- <para>The weekday is printed according to the locale choice of the
- user.</para>
+ <para>The weekday is printed in the abbreviated English language form. The formatting is locale-independent.</para>
+
+ <para>In some cases timestamps are shown in the UTC timezone instead of the local timezone, which is indicated via
+ the <literal>UTC</literal> timezone specifier in the output.</para>
+
+ <para>In some cases timestamps are shown with microsecond granularity. In this case the sub-second remainder is
+ separated by a full stop from the seconds component.</para>
</refsect1>
<refsect1>
<title>Parsing Timestamps</title>
- <para>When parsing, systemd will accept a similar syntax, but
- expects no timezone specification, unless it is given as the
- literal string "UTC". In this case, the time is considered in UTC,
- otherwise in the local timezone. The weekday specification is
- optional, but when the weekday is specified, it must either be in
- the abbreviated (<literal>Wed</literal>) or non-abbreviated
- (<literal>Wednesday</literal>) English language form (case does
- not 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, respectively, 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).</para>
-
- <para>A timestamp is considered invalid if a weekday is specified
- and the date does not actually match the specified day of the
- week.</para>
+ <para>When parsing, systemd will accept a similar syntax, but expects no timezone specification, unless it is given
+ as the literal string <literal>UTC</literal> (for the UTC timezone) or is specified to be the locally configured
+ timezone. Other timezones than the local and UTC are not supported. The weekday specification is optional, but when
+ the weekday is specified, it must either be in the abbreviated (<literal>Wed</literal>) or non-abbreviated
+ (<literal>Wednesday</literal>) English language form (case does not 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,
+ respectively, 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).</para>
+
+ <para>A timestamp is considered invalid if a weekday is specified and the date does not match the specified day of
+ the week.</para>
<para>When parsing, systemd will also accept a few special
placeholders instead of timestamps: <literal>now</literal> may be
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
- 11:12:13.9900009 → Fri 2012-11-23 11:12:13
- format_timestamp_us: Fri 2012-11-23 11:12:13.990000
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
- +3h30min UTC → -EINVAL
-5s → Fri 2012-11-23 18:15:17
11min ago → Fri 2012-11-23 18:04:22
- 11min ago UTC → -EINVAL
@1395716396 → Tue 2014-03-25 03:59:56</programlisting>
- <para>Note that timestamps printed by systemd will not be parsed
- correctly by systemd, as the timezone specification is not
- accepted, and printing timestamps is subject to locale settings
- for the weekday, while parsing only accepts English weekday
- names.</para>
+ <para>Note that timestamps displayed by remote systems with a non-matching timezone are usually not parsable
+ locally, as the timezone component is not understood (unless it happens to be <literal>UTC</literal>).</para>
- <para>In some cases, systemd will display a relative timestamp
- (relative to the current time, or the time of invocation of the
- command) instead or in addition to an absolute timestamp as
- described above. A relative timestamp is formatted as
- follows:</para>
+ <para>Timestamps may also be specified with microsecond granularity. The sub-second remainder is expected separated
+ by a full stop from the seconds component. Example:</para>
+
+ <programlisting>2014-03-25 03:59:56.654563</programlisting>
+
+ <para>In some cases, systemd will display a relative timestamp (relative to the current time, or the time of
+ invocation of the command) instead of or in addition to an absolute timestamp as described above. A relative
+ timestamp is formatted as follows:</para>
- <para>2 months 5 days ago</para>
+ <programlisting>2 months 5 days ago</programlisting>
- <para>Note that any relative timestamp will also parse correctly
- where a timestamp is expected. (see above)</para>
+ <para>Note that a relative timestamp is also accepted where a timestamp is expected (see above).</para>
</refsect1>
<refsect1>
second component is not specified, <literal>:00</literal> is
assumed.</para>
- <para>A timezone specification is not expected, unless it is given
- as the literal string "UTC", similarly to timestamps.</para>
+ <para>A timezone specification is not expected, unless it is given as the literal string <literal>UTC</literal>, or
+ the local timezone, similar to the supported syntax of timestamps (see above). Non-local timezones except for UTC
+ are not supported.</para>
<para>The special expressions
<literal>minutely</literal>,
<para>Examples for valid timestamps and their
normalized form:</para>
-<programlisting> 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
+<programlisting> 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, 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
- 12..14:10,20,30 → *-*-* 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
-05:40:23.4200004/3.1700005 → 05:40:23.420000/3.170001
- 2003-02..04-05 → 2003-02,03,04-05 00:00:00
- 2003-03-05 05:40 UTC → 2003-03-05 05:40:00 UTC
- 2003-03-05 → 2003-03-05 00:00:00
- 03-05 → *-03-05 00:00:00
- hourly → *-*-* *:00:00
- daily → *-*-* 00:00:00
- daily UTC → *-*-* 00:00:00 UTC
- monthly → *-*-01 00:00:00
- weekly → Mon *-*-* 00:00:00
- yearly → *-01-01 00:00:00
- annually → *-01-01 00:00:00
- *:2/3 → *-*-* *:02/3:00</programlisting>
+ *-*-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
+ 12..14:10,20,30 → *-*-* 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
+ 05:40:23.4200004/3.1700005 → 05:40:23.420000/3.170001
+ 2003-02..04-05 → 2003-02,03,04-05 00:00:00
+ 2003-03-05 05:40 UTC → 2003-03-05 05:40:00 UTC
+ 2003-03-05 → 2003-03-05 00:00:00
+ 03-05 → *-03-05 00:00:00
+ hourly → *-*-* *:00:00
+ daily → *-*-* 00:00:00
+ daily UTC → *-*-* 00:00:00 UTC
+ monthly → *-*-01 00:00:00
+ weekly → Mon *-*-* 00:00:00
+ yearly → *-01-01 00:00:00
+ annually → *-01-01 00:00:00
+ *:2/3 → *-*-* *:02/3:00</programlisting>
<para>Calendar events are used by timer units, see
<citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>
projects / thirdparty / systemd.git / blobdiff