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12b42c7667
This did not really work out as we had hoped. Trying to do this upstream introduced several problems that probably makes it better suited as a downstream patch after all. At any rate, it is not releaseable in the current state, so we at least need to revert this before the release. * by adjusting the path to binaries, but not do the same thing to the search path we end up with inconsistent man-pages. Adjusting the search path too would be quite messy, and it is not at all obvious that this is worth the effort, but at any rate it would have to be done before we could ship this. * this means that distributed man-pages does not make sense as they depend on config options, and for better or worse we are still distributing man pages, so that is something that definitely needs sorting out before we could ship with this patch. * we have long held that split-usr is only minimally supported in order to boot, and something we hope will eventually go away. So before we start adding even more magic/effort in order to make this work nicely, we should probably question if it makes sense at all.
298 lines
12 KiB
XML
298 lines
12 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd.time">
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<refentryinfo>
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<title>systemd.time</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd.time</refentrytitle>
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<manvolnum>7</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd.time</refname>
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<refpurpose>Time and date specifications</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<para>In systemd, timestamps, time spans, and calendar events are
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displayed and may be specified in closely related syntaxes.</para>
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</refsect1>
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<refsect1>
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<title>Displaying Time Spans</title>
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<para>Time spans refer to time durations. On display, systemd will
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present time spans as a space-separated series of time values each
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suffixed by a time unit.</para>
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<programlisting>2h 30min</programlisting>
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<para>All specified time values are meant to be added up. The
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above hence refers to 150 minutes.</para>
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</refsect1>
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<refsect1>
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<title>Parsing Time Spans</title>
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<para>When parsing, systemd will accept the same time span syntax.
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Separating spaces may be omitted. The following time units are
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understood:</para>
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<itemizedlist>
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<listitem><para>usec, us</para></listitem>
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<listitem><para>msec, ms</para></listitem>
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<listitem><para>seconds, second, sec, s</para></listitem>
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<listitem><para>minutes, minute, min, m</para></listitem>
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<listitem><para>hours, hour, hr, h</para></listitem>
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<listitem><para>days, day, d</para></listitem>
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<listitem><para>weeks, week, w</para></listitem>
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<listitem><para>months, month</para></listitem>
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<listitem><para>years, year, y</para></listitem>
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</itemizedlist>
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<para>If no time unit is specified, generally seconds are assumed,
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but some exceptions exist and are marked as such. In a few cases
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<literal>ns</literal>, <literal>nsec</literal> is accepted too,
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where the granularity of the time span allows for this.</para>
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<para>Examples for valid time span specifications:</para>
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<programlisting>2 h
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2hours
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48hr
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1y 12month
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55s500ms
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300ms20s 5day</programlisting>
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</refsect1>
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<refsect1>
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<title>Displaying Timestamps</title>
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<para>Timestamps refer to specific, unique points in time. On
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display, systemd will format these in the local timezone as
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follows:</para>
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<programlisting>Fri 2012-11-23 23:02:15 CET</programlisting>
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<para>The weekday is printed according to the locale choice of the
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user.</para>
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</refsect1>
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<refsect1>
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<title>Parsing Timestamps</title>
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<para>When parsing systemd will accept a similar timestamp syntax,
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but excluding any timezone specification (this limitation might be
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removed eventually). The weekday specification is optional, but
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when the weekday is specified it must either be in the abbreviated
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(<literal>Wed</literal>) or non-abbreviated
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(<literal>Wednesday</literal>) English language form (case does
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not matter), and is not subject to the locale choice of the user.
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Either the date, or the time part may be omitted, in which case
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the current date or 00:00:00, resp., is assumed. The seconds
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component of the time may also be omitted, in which case ":00" is
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assumed. Year numbers may be specified in full or may be
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abbreviated (omitting the century).</para>
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<para>A timestamp is considered invalid if a weekday is specified
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and the date does not actually match the specified day of the
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week.</para>
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<para>When parsing, systemd will also accept a few special
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placeholders instead of timestamps: <literal>now</literal> may be
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used to refer to the current time (or of the invocation of the
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command that is currently executed). <literal>today</literal>,
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<literal>yesterday</literal>, <literal>tomorrow</literal> refer to
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00:00:00 of the current day, the day before or the next day,
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respectively.</para>
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<para>When parsing, systemd will also accept relative time
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specifications. A time span (see above) that is prefixed with
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<literal>+</literal> is evaluated to the current time plus the
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specified time span. Correspondingly, a time span that is prefixed
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with <literal>-</literal> is evaluated to the current time minus
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the specified time span. Instead of prefixing the time span with
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<literal>+</literal> or <literal>-</literal>, it may also be
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suffixed with a space and the word <literal>left</literal> or
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<literal>ago</literal>.</para>
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<para>Finally, a timespan prefixed with <literal>@</literal> is
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evaluated relative to the UNIX time epoch 1st Jan, 1970,
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00:00.</para>
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<para>Examples for valid timestamps and their normalized form
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(assuming the current time was 2012-11-23 18:15:22):</para>
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<programlisting>Fri 2012-11-23 11:12:13 → Fri 2012-11-23 11:12:13
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2012-11-23 11:12:13 → Fri 2012-11-23 11:12:13
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2012-11-23 → Fri 2012-11-23 00:00:00
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12-11-23 → Fri 2012-11-23 00:00:00
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11:12:13 → Fri 2012-11-23 11:12:13
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11:12 → Fri 2012-11-23 11:12:00
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now → Fri 2012-11-23 18:15:22
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today → Fri 2012-11-23 00:00:00
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yesterday → Fri 2012-11-22 00:00:00
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tomorrow → Fri 2012-11-24 00:00:00
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+3h30min → Fri 2012-11-23 21:45:22
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-5s → Fri 2012-11-23 18:15:17
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11min ago → Fri 2012-11-23 18:04:22
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@1395716396 → Tue 2014-03-25 03:59:56</programlisting>
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<para>Note that timestamps printed by systemd will not be parsed
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correctly by systemd, as the timezone specification is not
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accepted, and printing timestamps is subject to locale settings
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for the weekday while parsing only accepts English weekday
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names.</para>
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<para>In some cases, systemd will display a relative timestamp
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(relative to the current time, or the time of invocation of the
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command) instead or in addition to an absolute timestamp as
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described above. A relative timestamp is formatted as
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follows:</para>
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<para>2 months 5 days ago</para>
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<para>Note that any relative timestamp will also parse correctly
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where a timestamp is expected. (see above)</para>
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</refsect1>
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<refsect1>
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<title>Calendar Events</title>
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<para>Calendar events may be used to refer to one or more points
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in time in a single expression. They form a superset of the
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absolute timestamps explained above:</para>
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<programlisting>Thu,Fri 2012-*-1,5 11:12:13</programlisting>
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<para>The above refers to 11:12:13 of the first or fifth day of
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any month of the year 2012, but only if that day is a Thursday or
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Friday.</para>
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<para>The weekday specification is optional. If specified, it
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should consist of one or more English language weekday names,
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either in the abbreviated (Wed) or non-abbreviated (Wednesday)
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form (case does not matter), separated by commas. Specifying two
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weekdays separated by <literal>-</literal> refers to a range of
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continuous weekdays. <literal>,</literal> and <literal>-</literal>
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may be combined freely.</para>
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<para>In the date and time specifications, any component may be
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specified as <literal>*</literal> in which case any value will
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match. Alternatively, each component can be specified as a list of
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values separated by commas. Values may also be suffixed with
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<literal>/</literal> and a repetition value, which indicates that
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the value and all values plus multiples of the repetition value
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are matched.</para>
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<para>Either time or date specification may be omitted, in which
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case the current day and 00:00:00 is implied, respectively. If the
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second component is not specified, <literal>:00</literal> is
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assumed.</para>
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<para>Timezone names may not be specified.</para>
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<para>The special expressions
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<literal>minutely</literal>,
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<literal>hourly</literal>, <literal>daily</literal>,
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<literal>monthly</literal>, <literal>weekly</literal>,
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<literal>yearly</literal>,
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<literal>quarterly</literal>,
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<literal>semiannually</literal> may be used as
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calendar events which refer to
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<literal>*-*-* *:*:00</literal>,
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<literal>*-*-* *:00:00</literal>,
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<literal>*-*-* 00:00:00</literal>,
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<literal>*-*-01 00:00:00</literal>,
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<literal>Mon *-*-* 00:00:00</literal>,
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<literal>*-01-01 00:00:00</literal>,
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<literal>*-01,04,07,10-01 00:00:0</literal> and
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<literal>*-01,07-01 00:00:00</literal> respectively.
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</para>
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<para>Examples for valid timestamps and their
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normalized form:</para>
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<programlisting> Sat,Thu,Mon-Wed,Sat-Sun → Mon-Thu,Sat,Sun *-*-* 00:00:00
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Mon,Sun 12-*-* 2,1:23 → Mon,Sun 2012-*-* 01,02:23:00
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Wed *-1 → Wed *-*-01 00:00:00
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Wed-Wed,Wed *-1 → Wed *-*-01 00:00:00
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Wed, 17:48 → Wed *-*-* 17:48:00
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Wed-Sat,Tue 12-10-15 1:2:3 → Tue-Sat 2012-10-15 01:02:03
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*-*-7 0:0:0 → *-*-07 00:00:00
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10-15 → *-10-15 00:00:00
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monday *-12-* 17:00 → Mon *-12-* 17:00:00
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Mon,Fri *-*-3,1,2 *:30:45 → Mon,Fri *-*-01,02,03 *:30:45
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12,14,13,12:20,10,30 → *-*-* 12,13,14:10,20,30:00
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mon,fri *-1/2-1,3 *:30:45 → Mon,Fri *-01/2-01,03 *:30:45
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03-05 08:05:40 → *-03-05 08:05:40
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08:05:40 → *-*-* 08:05:40
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05:40 → *-*-* 05:40:00
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Sat,Sun 12-05 08:05:40 → Sat,Sun *-12-05 08:05:40
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Sat,Sun 08:05:40 → Sat,Sun *-*-* 08:05:40
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2003-03-05 05:40 → 2003-03-05 05:40:00
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2003-03-05 → 2003-03-05 00:00:00
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03-05 → *-03-05 00:00:00
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hourly → *-*-* *:00:00
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daily → *-*-* 00:00:00
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monthly → *-*-01 00:00:00
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weekly → Mon *-*-* 00:00:00
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yearly → *-01-01 00:00:00
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annually → *-01-01 00:00:00
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*:2/3 → *-*-* *:02/3:00</programlisting>
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<para>Calendar events are used by timer units, see
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<citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for details.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.timer</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.directives</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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