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man: redefine SUPPORT_END= to mean one day earlier

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I thought it would be nice to specify the last day of support, because I
thought it'd seem more natural. But in practice this doesn't work well, because
such a truncated timestamp is usually taken to mean midnight that starts the
given date. I.e. 2011-12-13 is a shorthand for 2011-12-13 00:00:00 and not
2011-12-13 23:59:59.999999999999. Let's instead specify that the given date is
the first unsupported day, which is meaningful for humans, and let the computer
treat it as midnight, which gives consistent interpratation.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2022-07-09 17:50:36 +02:00
parent c9472f9102
commit caa779abb6
1 changed files with 6 additions and 3 deletions
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9
man/os-release.xml
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@ -355,9 +355,12 @@
<listitem><para>The date at which support for this version of the OS ends. (What exactly "lack of
support" means varies between vendors, but generally users should assume that updates, including
security fixes, will not be provided.) The value is a date in the format
<literal>YYYY-MM-DD</literal>, and specifies the last day on which support <emphasis>is</emphasis>
provided.</para></listitem>
security fixes, will not be provided.) The value is a date in the ISO 8601 format
<literal>YYYY-MM-DD</literal>, and specifies the first day on which support <emphasis>is
not</emphasis> provided.</para>
<para>For example, <literal>SUPPORT_END=2001-01-01</literal> means that the system was supported
until the end of the last day of the previous millenium.</para></listitem>
</varlistentry>
<varlistentry>