74 lines
5.4 KiB
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74 lines
5.4 KiB
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<TITLE>CLHS: Function GET-UNIVERSAL-TIME, GET-DECODED-TIME</TITLE>
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<A NAME="get-universal-time"><A NAME="get-decoded-time"><I>Function</I> <B>GET-UNIVERSAL-TIME, GET-DECODED-TIME</B></A></A> <P>
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<P><B>Syntax:</B><P>
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<P>
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<B>get-universal-time</B> <I><I><no arguments></I></I> => <I>universal-time</I><P>
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<P>
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<B>get-decoded-time</B> <I><I><no arguments></I></I><P> => <I>second, minute, hour, date, month, year, day, daylight-p, zone</I><P>
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<P>
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<P><B>Arguments and Values:</B><P>
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<P>
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<I>universal-time</I>---a <A REL=DEFINITION HREF="26_glo_u.htm#universal_time"><I>universal time</I></A>. <P>
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<I>second</I>, <I>minute</I>, <I>hour</I>, <I>date</I>, <I>month</I>, <I>year</I>, <I>day</I>, <I>daylight-p</I>, <I>zone</I>---a <A REL=DEFINITION HREF="26_glo_d.htm#decoded_time"><I>decoded time</I></A>. <P>
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<P><B>Description:</B><P>
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<P>
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<A REL=DEFINITION HREF="#get-universal-time"><B>get-universal-time</B></A> returns the current time, represented as a <A REL=DEFINITION HREF="26_glo_u.htm#universal_time"><I>universal time</I></A>. <P>
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<A REL=DEFINITION HREF="#get-decoded-time"><B>get-decoded-time</B></A> returns the current time, represented as a <A REL=DEFINITION HREF="26_glo_d.htm#decoded_time"><I>decoded time</I></A>. <P>
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<P><B>Examples:</B><P>
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<P>
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<PRE>
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;; At noon on July 4, 1976 in Eastern Daylight Time.
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(get-decoded-time) => 0, 0, 12, 4, 7, 1976, 6, <A REL=DEFINITION HREF="26_glo_t.htm#true">true</A>, 5
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;; At exactly the same instant.
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(get-universal-time) => 2414332800
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;; Exactly five minutes later.
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(get-universal-time) => 2414333100
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;; The difference is 300 seconds (five minutes)
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(- * **) => 300
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</PRE>
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</TT> <P>
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<P><B>Side Effects:</B> None.
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<P>
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<P><B>Affected By:</B><P>
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<P>
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The time of day (i.e., the passage of time), the system clock's ability to keep accurate time, and the accuracy of the system clock's initial setting. <P>
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<P><B>Exceptional Situations:</B><P>
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<P>
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An error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_error.htm#error"><B>error</B></A> might be signaled if the current time cannot be determined. <P>
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<P><B>See Also:</B><P>
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<P>
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<A REL=DEFINITION HREF="f_dec_un.htm#decode-universal-time"><B>decode-universal-time</B></A>, <A REL=DEFINITION HREF="f_encode.htm#encode-universal-time"><B>encode-universal-time</B></A>, <A REL=CHILD HREF="25_ad.htm">Section 25.1.4 (Time)</A> <P>
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<P><B>Notes:</B><P>
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<P>
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<PRE>
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(get-decoded-time) == (decode-universal-time (get-universal-time))
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</PRE>
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</TT> <P>
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No <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A> is required to have a way to verify that the time returned is correct. However, if an <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A> provides a validity check (e.g., the failure to have properly initialized the system clock can be reliably detected) and that validity check fails, the <A REL=DEFINITION HREF="26_glo_i.htm#implementation"><I>implementation</I></A> is strongly encouraged (but not required) to signal an error of <A REL=DEFINITION HREF="26_glo_t.htm#type"><I>type</I></A> <A REL=DEFINITION HREF="e_error.htm#error"><B>error</B></A> (rather than, for example, returning a known-to-be-wrong value) that is <A REL=DEFINITION HREF="26_glo_c.htm#correctable"><I>correctable</I></A> by allowing the user to interactively set the correct time. <P>
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