94 lines
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HTML
94 lines
5 KiB
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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any later version published by the Free Software Foundation; with no
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>SRFI-18 Time (Guile Reference Manual)</title>
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="SRFI_002d18.html" rel="up" title="SRFI-18">
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</head>
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<body lang="en">
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<div class="subsubsection-level-extent" id="SRFI_002d18-Time">
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<div class="nav-panel">
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<p>
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Next: <a href="SRFI_002d18-Exceptions.html" accesskey="n" rel="next">SRFI-18 Exceptions</a>, Previous: <a href="SRFI_002d18-Condition-variables.html" accesskey="p" rel="prev">SRFI-18 Condition variables</a>, Up: <a href="SRFI_002d18.html" accesskey="u" rel="up">SRFI-18 - Multithreading support</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<h4 class="subsubsection" id="SRFI_002d18-Time-1"><span>7.5.15.4 SRFI-18 Time<a class="copiable-link" href="#SRFI_002d18-Time-1"> ¶</a></span></h4>
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<p>The SRFI-18 time functions manipulate time in two formats: a
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“time object” type that represents an absolute point in time in some
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implementation-specific way; and the number of seconds since some
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unspecified “epoch”. In Guile’s implementation, the epoch is the
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Unix epoch, 00:00:00 UTC, January 1, 1970.
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</p>
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<dl class="first-deffn first-defun-alias-first-deffn">
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<dt class="deffn defun-alias-deffn" id="index-current_002dtime-1"><span class="category-def">Function: </span><span><strong class="def-name">current-time</strong><a class="copiable-link" href="#index-current_002dtime-1"> ¶</a></span></dt>
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<dd><p>Return the current time as a time object. This procedure replaces
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the procedure of the same name in the core library, which returns the
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current time in seconds since the epoch.
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</p></dd></dl>
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<dl class="first-deffn first-defun-alias-first-deffn">
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<dt class="deffn defun-alias-deffn" id="index-time_003f"><span class="category-def">Function: </span><span><strong class="def-name">time?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-time_003f"> ¶</a></span></dt>
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<dd><p>Returns <code class="code">#t</code> if <var class="var">obj</var> is a time object, <code class="code">#f</code> otherwise.
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</p></dd></dl>
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<dl class="first-deffn first-defun-alias-first-deffn">
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<dt class="deffn defun-alias-deffn" id="index-time_002d_003eseconds"><span class="category-def">Function: </span><span><strong class="def-name">time->seconds</strong> <var class="def-var-arguments">time</var><a class="copiable-link" href="#index-time_002d_003eseconds"> ¶</a></span></dt>
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<dt class="deffnx defunx-alias-deffnx def-cmd-deffn" id="index-seconds_002d_003etime"><span class="category-def">Function: </span><span><strong class="def-name">seconds->time</strong> <var class="def-var-arguments">seconds</var><a class="copiable-link" href="#index-seconds_002d_003etime"> ¶</a></span></dt>
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<dd><p>Convert between time objects and numerical values representing the
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number of seconds since the epoch. When converting from a time object
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to seconds, the return value is the number of seconds between
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<var class="var">time</var> and the epoch. When converting from seconds to a time
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object, the return value is a time object that represents a time
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<var class="var">seconds</var> seconds after the epoch.
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</p></dd></dl>
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</div>
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</body>
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