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>decode-universal-time | Common Lisp Nova Spec</TITLE
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>Common Lisp Nova Spec</A
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> <SPAN CLASS="breadcrumb-item"
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>→ <A HREF="25_Environment.html"
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>25. Environment</A
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>→ <A HREF="f_decode-universal-time.html"
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>decode-universal-time</A
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="decode-universal-time"
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></SPAN
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><B
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>decode-universal-time</B
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></TD
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><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
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><I
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>Function</I
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><UL CLASS="subtoc"
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><DL
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><DT
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><B
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>Syntax</B
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></DT
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><DD
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><DIV
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><B
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>decode-universal-time</B
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> <SPAN CLASS="cmssi"
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>universal-time</SPAN
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> <SPAN CLASS="cmtt"
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>&optional</SPAN
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> <SPAN CLASS="cmssi"
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>time-zone</SPAN
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> </DIV
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><DIV
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><SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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> <SPAN CLASS="cmssi"
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>second,</SPAN
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> <SPAN CLASS="cmssi"
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>minute,</SPAN
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> <SPAN CLASS="cmssi"
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>hour,</SPAN
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> <SPAN CLASS="cmssi"
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>date,</SPAN
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> <SPAN CLASS="cmssi"
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>month,</SPAN
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> <SPAN CLASS="cmssi"
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>year,</SPAN
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> <SPAN CLASS="cmssi"
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>day,</SPAN
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> <SPAN CLASS="cmssi"
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>daylight-p,</SPAN
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> <SPAN CLASS="cmssi"
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>zone</SPAN
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></DIV
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></DD
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><DT
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><B
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>Arguments and Values</B
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></DT
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><DD
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><P CLASS="j"
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><VAR CLASS="param"
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>universal-time</VAR
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> — a <A HREF="26_1_Glossary.html#universal_time"
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><EM CLASS="term"
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>universal time</EM
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></A
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>time-zone</VAR
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> — a <A HREF="26_1_Glossary.html#time_zone"
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><EM CLASS="term"
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>time zone</EM
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></A
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>second</VAR
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>, <VAR CLASS="param"
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>minute</VAR
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>, <VAR CLASS="param"
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>hour</VAR
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>, <VAR CLASS="param"
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>date</VAR
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>, <VAR CLASS="param"
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>month</VAR
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>, <VAR CLASS="param"
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>year</VAR
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>, <VAR CLASS="param"
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>day</VAR
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>, <VAR CLASS="param"
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>daylight-p</VAR
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>, <VAR CLASS="param"
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>zone</VAR
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> — a <A HREF="26_1_Glossary.html#decoded_time"
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><EM CLASS="term"
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>decoded time</EM
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></A
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>.</P
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></DD
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><DT
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><B
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>Description</B
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></DT
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><DD
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><P CLASS="j"
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>Returns the <A HREF="26_1_Glossary.html#decoded_time"
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><EM CLASS="term"
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>decoded time</EM
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></A
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> represented by the given <A HREF="26_1_Glossary.html#universal_time"
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><EM CLASS="term"
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>universal time</EM
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></A
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>. </P
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><P CLASS="j"
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>If <VAR CLASS="param"
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>time-zone</VAR
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> is not supplied, it defaults to the current time zone adjusted for daylight saving time. If <VAR CLASS="param"
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>time-zone</VAR
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> is supplied, daylight saving time information is ignored. The daylight saving time flag is <SPAN CLASS="misc"
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><B
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>nil</B
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></SPAN
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> if <VAR CLASS="param"
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>time-zone</VAR
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> is supplied.</P
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></DD
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><DT
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><B
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>Examples</B
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></DT
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><DD
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><PRE CLASS="screen"
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> (decode-universal-time 0 0) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 0, 0, 0, 1, 1, 1900, 0, <A HREF="26_1_Glossary.html#false"
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><EM CLASS="term"
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>false</EM
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></A
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>, 0
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;; The next two examples assume Eastern Daylight Time.
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(decode-universal-time 2414296800 5) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 0, 0, 1, 4, 7, 1976, 6, <A HREF="26_1_Glossary.html#false"
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><EM CLASS="term"
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>false</EM
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></A
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>, 5
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(decode-universal-time 2414293200) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 0, 0, 1, 4, 7, 1976, 6, <A HREF="26_1_Glossary.html#true"
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><EM CLASS="term"
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>true</EM
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></A
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>, 5
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;; This example assumes that the time zone is Eastern Daylight Time
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;; (and that the time zone is constant throughout the example).
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(let* ((here (nth 8 (multiple-value-list (get-decoded-time)))) ;Time zone
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(recently (get-universal-time))
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(a (nthcdr 7 (multiple-value-list (decode-universal-time recently))))
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(b (nthcdr 7 (multiple-value-list (decode-universal-time recently here)))))
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(list a b (equal a b))) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> ((T 5) (NIL 5) NIL)</PRE
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></DD
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><DT
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><B
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>Affected By</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="26_1_Glossary.html#implementation-dependent"
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><EM CLASS="term"
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>Implementation-dependent</EM
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></A
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> mechanisms for calculating when or if daylight savings time is in effect for any given session.</P
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></DD
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><DT
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><B
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>See Also</B
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></DT
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><DD
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><P CLASS="j"
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><A HREF="f_encode-universal-time.html" CLASS="funref"
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><B
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>encode-universal-time</B
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></A
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>, <A HREF="f_get-universal-time.html" CLASS="funref"
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><B
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>get-universal-time</B
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></A
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>, <A HREF="25_1_The_External_Environment.html#sec_25_1_4" CLASS="secref"
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><SPAN CLASS="cmr"
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>Section</SPAN
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> <SPAN CLASS="cmr"
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>25.1.4</SPAN
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> <SPAN CLASS="cmr"
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>(Time)</SPAN
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></A
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></P
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></DL
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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