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>get-universal-time, get-decoded-time | Common Lisp Nova Spec</TITLE
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><B
>get-universal-time, get-decoded-time</B
></TD
><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
><I
>Function</I
></TD
></TR
></TABLE
><HR
></DIV
><UL CLASS="subtoc"
></UL
><DL
><DT
><B
>Syntax</B
></DT
><DD
><P CLASS="j"
><B
>get-universal-time</B
> &#10216;<I
>no</I
> <A HREF="26_1_Glossary.html#argument"
><EM CLASS="term"
>arguments</EM
></A
>&#10217; <SPAN CLASS="arrow"
>&#8594;</SPAN
> <SPAN CLASS="cmssi"
>universal-time</SPAN
></P
><DIV
><B
>get-decoded-time</B
> <SPAN CLASS="cmsy"
>&#10216;</SPAN
><I
>no</I
> <A HREF="26_1_Glossary.html#argument"
><EM CLASS="term"
>arguments</EM
></A
><SPAN CLASS="cmsy"
>&#10217;</SPAN
> </DIV
><DIV
><SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> <SPAN CLASS="cmssi"
>second,</SPAN
> <SPAN CLASS="cmssi"
>minute,</SPAN
> <SPAN CLASS="cmssi"
>hour,</SPAN
> <SPAN CLASS="cmssi"
>date,</SPAN
> <SPAN CLASS="cmssi"
>month,</SPAN
> <SPAN CLASS="cmssi"
>year,</SPAN
> <SPAN CLASS="cmssi"
>day,</SPAN
> <SPAN CLASS="cmssi"
>daylight-p,</SPAN
> <SPAN CLASS="cmssi"
>zone</SPAN
></DIV
></DD
><DT
><B
>Arguments and Values</B
></DT
><DD
><P CLASS="j"
><VAR CLASS="param"
>universal-time</VAR
> &#8212; a <A HREF="26_1_Glossary.html#universal_time"
><EM CLASS="term"
>universal time</EM
></A
>. </P
><P CLASS="j"
><VAR CLASS="param"
>second</VAR
>, <VAR CLASS="param"
>minute</VAR
>, <VAR CLASS="param"
>hour</VAR
>, <VAR CLASS="param"
>date</VAR
>, <VAR CLASS="param"
>month</VAR
>, <VAR CLASS="param"
>year</VAR
>, <VAR CLASS="param"
>day</VAR
>, <VAR CLASS="param"
>daylight-p</VAR
>, <VAR CLASS="param"
>zone</VAR
> &#8212; a <A HREF="26_1_Glossary.html#decoded_time"
><EM CLASS="term"
>decoded time</EM
></A
>.</P
></DD
><DT
><B
>Description</B
></DT
><DD
><P CLASS="j"
><A HREF="f_get-universal-time.html" CLASS="funref"
><B
>get-universal-time</B
></A
> returns the current time, represented as a <A HREF="26_1_Glossary.html#universal_time"
><EM CLASS="term"
>universal time</EM
></A
>. </P
><P CLASS="j"
><A HREF="f_get-universal-time.html" CLASS="funref"
><B
>get-decoded-time</B
></A
> returns the current time, represented as a <A HREF="26_1_Glossary.html#decoded_time"
><EM CLASS="term"
>decoded time</EM
></A
>.</P
></DD
><DT
><B
>Examples</B
></DT
><DD
><PRE CLASS="screen"
>;; At noon on July 4, 1976 in Eastern Daylight Time.
(get-decoded-time) <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> 0, 0, 12, 4, 7, 1976, 6, <A HREF="26_1_Glossary.html#true"
><EM CLASS="term"
>true</EM
></A
>, 5
;; At exactly the same instant.
(get-universal-time) <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> 2414332800
;; Exactly five minutes later.
(get-universal-time) <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> 2414333100
;; The difference is 300 seconds (five minutes)
(- * **) <SPAN CLASS="cmsy"
><SPAN CLASS="arrow"
>&#8594;</SPAN
></SPAN
> 300</PRE
></DD
><DT
><B
>Affected By</B
></DT
><DD
><P CLASS="j"
>The time of day (<I CLASS="i"
><I
>i.e.</I
></I
>, the passage of time), the system clock&#8217;s ability to keep accurate time, and the accuracy of the system clock&#8217;s initial setting.</P
></DD
><DT
><B
>Exceptional Situations</B
></DT
><DD
><P CLASS="j"
>An error of <A HREF="26_1_Glossary.html#type"
><EM CLASS="term"
>type</EM
></A
> <A HREF="t_error.html" CLASS="typeref"
><B
>error</B
></A
> might be signaled if the current time cannot be determined.</P
></DD
><DT
><B
>See Also</B
></DT
><DD
><P CLASS="j"
><A HREF="f_decode-universal-time.html" CLASS="funref"
><B
>decode-universal-time</B
></A
>, <A HREF="f_encode-universal-time.html" CLASS="funref"
><B
>encode-universal-time</B
></A
>, <A HREF="25_1_The_External_Environment.html#sec_25_1_4" CLASS="secref"
><SPAN CLASS="cmr"
>Section</SPAN
> <SPAN CLASS="cmr"
>25.1.4</SPAN
> <SPAN CLASS="cmr"
>(Time)</SPAN
></A
></P
></DD
><DT
><B
>Notes</B
></DT
><DD
><PRE CLASS="screen"
>(get-decoded-time) <SPAN CLASS="cmsy"
><SPAN STYLE="font-size:16px;vertical-align:-2px"
>&#8801;</SPAN
></SPAN
> (decode-universal-time (get-universal-time))</PRE
><P CLASS="j"
>No <A HREF="26_1_Glossary.html#implementation"
><EM CLASS="term"
>implementation</EM
></A
> is required to have a way to verify that the time returned is correct. However, if an <A HREF="26_1_Glossary.html#implementation"
><EM CLASS="term"
>implementation</EM
></A
> provides a validity check (<I CLASS="i"
><I
>e.g.</I
></I
>, the failure to have properly initialized the system clock can be reliably detected) and that validity check fails, the <A HREF="26_1_Glossary.html#implementation"
><EM CLASS="term"
>implementation</EM
></A
> is strongly encouraged (but not required) to signal an error of <A HREF="26_1_Glossary.html#type"
><EM CLASS="term"
>type</EM
></A
> <A HREF="t_error.html" CLASS="typeref"
><B
>error</B
></A
> (rather than, for example, returning a known-to-be-wrong value) that is <A HREF="26_1_Glossary.html#correctable"
><EM CLASS="term"
>correctable</EM
></A
> by allowing the user to interactively set the correct time.</P
></DD
></DL
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