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<p>Check if the calendar is Gregorian. </p>
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<tr><td class="fieldname"><em><a class="anchor" id="a5f1927f4c71fafa4712265e6b68958b5a69f0c20e321e3b914883869466122c61"></a>is_dst</em>&#160;</td><td class="fielddoc">
<p>Check if the current time is in daylight time savings. </p>
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