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<title>KSystemTimeZones</title>
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KDE 4.7 PyKDE API Reference
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<h1>KSystemTimeZones Class Reference</h1>
<code>from PyKDE4.kdecore import *</code>
<p>
Inherits: QObject<br />
<h2>Detailed Description</h2>
<dl class="abstract" compact><dt><b>Abstract class:</b></dt>
<dd>This class can be used as a base class for new classes, but can not be instantiated directly.</dd></dl>
<p>The KSystemTimeZones class represents the system time zone database, consisting
of a collection of individual system time zone definitions, indexed by name.
Each individual time zone is defined in a KSystemTimeZone instance. Additional
time zones (of any class derived from KTimeZone) may be added if desired.
</p>
<p>
At initialisation, KSystemTimeZones on UNIX systems reads the zone.tab file
to obtain the list of system time zones, and creates a KSystemTimeZone
instance for each one.
</p>
<p>
<dl class="note" compact><dt><b>Note:</b></dt><dd> KSystemTimeZones gets the system's time zone configuration, including
the current local system time zone and the location of zone.tab, from the KDE
time zone daemon, ktimezoned. If ktimezoned cannot be started, KSystemTimeZones
will only know about the UTC time zone.
</dd></dl> </p>
<p>
Note that KSystemTimeZones is not derived from KTimeZones, but instead contains
a KTimeZones instance which holds the system time zone database. Convenience
static methods are defined to access its data, or alternatively you can access
the KTimeZones instance directly via the timeZones() method.
</p>
<p>
As an example, find the local time in Oman corresponding to the local system
time of 12:15:00 on 13th November 1999:
<pre class="fragment">
QDateTime sampleTime(QDate(1999,11,13), QTime(12,15,0), Qt.LocalTime);
KTimeZone local = KSystemTimeZones.local();
KTimeZone oman = KSystemTimeZones.zone("Asia/Muscat");
QDateTime omaniTime = local.convert(oman, sampleTime);
</pre>
</p>
<p>
<dl class="warning" compact><dt><b>Warning:</b></dt><dd> The time zones in the KSystemTimeZones collection are by default
instances of the KSystemTimeZone class, which uses the standard system
libraries to access time zone data, and whose functionality is limited to
what these libraries provide. For guaranteed accuracy for past time change
dates and time zone abbreviations, you should use KSystemTimeZones.readZone()
or the KTzfileTimeZone class instead, which provide accurate information from
the time zone definition files (but are likely to incur more overhead).
</dd></dl> </p>
<p>
<dl class="note" compact><dt><b>Note:</b></dt><dd> This class provides a facility to simulate the local system time
zone. This facility is provided for testing purposes only, and is only
available if the library is compiled with debug enabled. In release mode,
simulation is inoperative and the real local system time zone is used at all
times.
</dd></dl> </p>
<p>
System time zone access
<dl class="see" compact><dt><b>See also:</b></dt><dd> KTimeZones, KSystemTimeZone, KSystemTimeZoneSource, KTzfileTimeZone
</dd></dl>
<dl class="author" compact><dt><b>Author:</b></dt><dd> David Jarvie <djarvie@kde.org>. </dd></dl>
<dl class="author" compact><dt><b>Author:</b></dt><dd> S.R.Haque <srhaque@iee.org>. </dd></dl>
</p>
<table border="0" cellpadding="0" cellspacing="0"><tr><td colspan="2"><br><h2>Methods</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#KSystemTimeZones">__init__</a> (self)</td></tr>
<tr><td colspan="2"><br><h2>Static Methods</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#isSimulated">isSimulated</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#isTimeZoneDaemonAvailable">isTimeZoneDaemonAvailable</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../kdecore/KTimeZone.html">KTimeZone</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#local">local</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../kdecore/KTimeZone.html">KTimeZone</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#readZone">readZone</a> (QString name)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../kdecore/KTimeZone.html">KTimeZone</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#realLocalZone">realLocalZone</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#setLocalZone">setLocalZone</a> (<a href="../kdecore/KTimeZone.html">KTimeZone</a> tz)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../kdecore/KTimeZones.html">KTimeZones</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#timeZones">timeZones</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a href="../kdecore/KTimeZone.html">KTimeZone</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="#zone">zone</a> (QString name)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">QString </td><td class="memItemRight" valign="bottom"><a class="el" href="#zoneinfoDir">zoneinfoDir</a> ()</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">{QString:<a href="../kdecore/KTimeZone.html">KTimeZone</a>} </td><td class="memItemRight" valign="bottom"><a class="el" href="#zones">zones</a> ()</td></tr>
</table>
<hr><h2>Method Documentation</h2><a class="anchor" name="KSystemTimeZones"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">__init__</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"></div></div><hr><h2>Static Method Documentation</h2><a class="anchor" name="isSimulated"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">bool isSimulated</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">)</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Check whether there is a simulated local system time zone.
</p>
<p>
<dl class="warning" compact><dt><b>Warning:</b></dt><dd> This method is provided only for testing purposes, and should
not be used in released code. If the library is compiled without
debug enabled, isSimulated() always returns false.
To avoid confusion, it is recommended that calls to it should be
conditionally compiled, e.g.:
</dd></dl> <pre class="fragment">
#ifndef NDEBUG
if (KSystemTimeZones.isSimulated())
{
...
}
#endif
</pre>
</p>
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd> setLocalZone()
</dd></dl> <dl class="since" compact><dt><b>Since:</b></dt><dd> 4.3
</dd></dl>
</p></div></div><a class="anchor" name="isTimeZoneDaemonAvailable"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">bool isTimeZoneDaemonAvailable</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">)</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Return whether the KDE time zone daemon, ktimezoned, is available. If
not, UTC will be the only recognized time zone.
<dl class="since" compact><dt><b>Since:</b></dt><dd> 4.6
</dd></dl>
</p></div></div><a class="anchor" name="local"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../kdecore/KTimeZone.html">KTimeZone</a> local</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">)</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Returns the current local system time zone.
</p>
<p>
The idea of this routine is to provide a robust lookup of the local time
zone. On Unix systems, there are a variety of mechanisms for setting this
information, and no well defined way of getting it. For example, if you
set your time zone to "Europe/London", then the tzname[] maintained by
tzset() typically returns { "GMT", "BST" }. The function of this routine
is to actually return "Europe/London" (or rather, the corresponding
KTimeZone).
</p>
<p>
Note that depending on how the system stores its current time zone, this
routine may return a synonym of the expected time zone. For example,
"Europe/London", "Europe/Guernsey" and some other time zones are all
identical and there may be no way for the routine to distinguish which
of these is the correct zone name from the user's point of view.
</p>
<p>
<dl class="warning" compact><dt><b>Warning:</b></dt><dd> For testing purposes, if the library is compiled with debug
enabled, this method returns any simulated local system time
zone set by setLocalZone(). If the library is compiled in
release mode, it always returns the real local system time zone.
</dd></dl> </p>
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd> local system time zone. If necessary, we will use a series of
heuristics which end by returning UTC. We will never return NULL.
Note that if UTC is returned as a default, it may not belong to the
the collection returned by KSystemTimeZones.zones().
</dd></dl>
</p></div></div><a class="anchor" name="readZone"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../kdecore/KTimeZone.html">KTimeZone</a> readZone</td>
<td>(</td>
<td class="paramtype">QString </td>
<td class="paramname"><em>name</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Returns the time zone with the given name, containing the full time zone
definition read directly from the system time zone database. This may
incur a higher overhead than zone(), but will provide whatever historical
data the system holds.
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>name</em> </td><td> name of time zone
</td></tr> </table></dl>
<p> <dl class="return" compact><dt><b>Returns:</b></dt><dd> time zone (usually a KTzfileTimeZone instance), or invalid if not found
</dd></dl> <dl class="see" compact><dt><b>See also:</b></dt><dd> zone()
</dd></dl>
</p></div></div><a class="anchor" name="realLocalZone"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../kdecore/KTimeZone.html">KTimeZone</a> realLocalZone</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">)</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Return the real (not simulated) local system time zone.
</p>
<p>
<dl class="warning" compact><dt><b>Warning:</b></dt><dd> This method is provided only for testing purposes, and should
not be used in released code. If the library is compiled without
debug enabled, local() and realLocalZone() both return the real
local system time zone.
To avoid confusion, it is recommended that calls to
realLocalZone() should be conditionally compiled, e.g.:
</dd></dl> <pre class="fragment">
#ifndef NDEBUG
tz = KSystemTimeZones.realLocalZone();
#endif
</pre>
</p>
<p>
<dl class="see" compact><dt><b>See also:</b></dt><dd> setLocalZone()
</dd></dl> <dl class="since" compact><dt><b>Since:</b></dt><dd> 4.3
</dd></dl>
</p></div></div><a class="anchor" name="setLocalZone"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> setLocalZone</td>
<td>(</td>
<td class="paramtype"><a href="../kdecore/KTimeZone.html">KTimeZone</a> </td>
<td class="paramname"><em>tz</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Set or clear the simulated local system time zone.
</p>
<p>
<dl class="warning" compact><dt><b>Warning:</b></dt><dd> This method is provided only for testing purposes, and should
not be used in released code. If the library is compiled without
debug enabled, setLocalZone() has no effect.
To avoid confusion, it is recommended that calls to it should be
conditionally compiled, e.g.:
</dd></dl> <pre class="fragment">
#ifndef NDEBUG
KSystemTimeZones.setLocalZone(tz);
#endif
</pre>
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>tz</em> </td><td> the time zone to simulate, or an invalid KTimeZone instance
(i.e. <pre class="fragment"> tz.isValid() == false \endcode) to cancel
simulation
@since 4.3
</p></div></div><a class="anchor" name="timeZones"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../kdecore/KTimeZones.html">KTimeZones</a> timeZones</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">)</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Returns the unique KTimeZones instance containing the system time zones
collection. It is first created if it does not already exist.
</p>
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd> time zones.
</dd></dl>
</p></div></div><a class="anchor" name="zone"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"><a href="../kdecore/KTimeZone.html">KTimeZone</a> zone</td>
<td>(</td>
<td class="paramtype">QString </td>
<td class="paramname"><em>name</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Returns the time zone with the given name.
</p>
<p>
The time zone definition is obtained using system library calls, and may
not contain historical data. If you need historical time change data,
use the potentially slower method readZone().
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>name</em> </td><td> name of time zone
</td></tr> </table></dl>
<p> <dl class="return" compact><dt><b>Returns:</b></dt><dd> time zone (usually a KSystemTimeZone instance), or invalid if not found
</dd></dl> <dl class="see" compact><dt><b>See also:</b></dt><dd> readZone()
</dd></dl>
</p></div></div><a class="anchor" name="zoneinfoDir"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">QString zoneinfoDir</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">)</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Returns the location of the system time zone zoneinfo database.
</p>
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd> path of directory containing the zoneinfo database
</dd></dl>
</p></div></div><a class="anchor" name="zones"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">{QString:<a href="../kdecore/KTimeZone.html">KTimeZone</a>} zones</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">)</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Returns all the time zones defined in this collection.
</p>
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd> time zone collection
</dd></dl>
</p></div></div>
</div>
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