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Next: <a href="Day-of-week-items.html#Day-of-week-items" accesskey="n" rel="next">Day of week items</a>, Previous: <a href="Time-of-day-items.html#Time-of-day-items" accesskey="p" rel="prev">Time of day items</a>, Up: <a href="Date-Input-Formats.html#Date-Input-Formats" accesskey="u" rel="up">Date Input Formats</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Time-zone-items-1"></a>
<h3 class="section">B.4 Time zone items</h3>
<a name="index-time-zone-item-1"></a>
<p>A <em>time zone item</em> specifies an international time zone, indicated
by a small set of letters, e.g., ‘<samp>UTC</samp>’ or ‘<samp>Z</samp>’
for Coordinated Universal
Time. Any included periods are ignored. By following a
non-daylight-saving time zone by the string ‘<samp>DST</samp>’ in a separate
word (that is, separated by some white space), the corresponding
daylight saving time zone may be specified.
Alternatively, a non-daylight-saving time zone can be followed by a
time zone correction, to add the two values. This is normally done
only for ‘<samp>UTC</samp>’; for example, ‘<samp>UTC+05:30</samp>’ is equivalent to
‘<samp>+05:30</samp>’.
</p>
<p>Time zone items other than ‘<samp>UTC</samp>’ and ‘<samp>Z</samp>’
are obsolescent and are not recommended, because they
are ambiguous; for example, ‘<samp>EST</samp>’ has a different meaning in
Australia than in the United States. Instead, it’s better to use
unambiguous numeric time zone corrections like ‘<samp>-0500</samp>’, as
described in the previous section.
</p>
<p>If neither a time zone item nor a time zone correction is supplied,
time stamps are interpreted using the rules of the default time zone
(see <a href="Specifying-time-zone-rules.html#Specifying-time-zone-rules">Specifying time zone rules</a>).
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