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<h1>datetime.cpp</h1><p>Example of date &amp; time manipulation.</p>
<div class="fragment"><pre class="fragment"><span class="comment">// Copyright (C) 2006-2010 David Sugar, Tycho Softworks.</span>
<span class="comment">//</span>
<span class="comment">// This file is part of GNU uCommon C++.</span>
<span class="comment">//</span>
<span class="comment">// GNU uCommon C++ is free software: you can redistribute it and/or modify</span>
<span class="comment">// it under the terms of the GNU Lesser General Public License as published </span>
<span class="comment">// by the Free Software Foundation, either version 3 of the License, or</span>
<span class="comment">// (at your option) any later version.</span>
<span class="comment">//</span>
<span class="comment">// GNU uCommon C++ is distributed in the hope that it will be useful,</span>
<span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<span class="comment">// GNU Lesser General Public License for more details.</span>
<span class="comment">//</span>
<span class="comment">// You should have received a copy of the GNU Lesser General Public License</span>
<span class="comment">// along with GNU uCommon C++.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>

<span class="preprocessor">#ifndef DEBUG</span>
<span class="preprocessor"></span><span class="preprocessor">#define DEBUG</span>
<span class="preprocessor"></span><span class="preprocessor">#endif</span>
<span class="preprocessor"></span>
<span class="preprocessor">#include &lt;<a class="code" href="a00210.html" title="Top level include file for the GNU uCommon C++ core library.">ucommon/ucommon.h</a>&gt;</span>

<span class="preprocessor">#include &lt;stdio.h&gt;</span>

<span class="keyword">using namespace </span>UCOMMON_NAMESPACE;
<span class="keyword">using namespace </span>std;

<span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)
{
    Date date = Date(2003, 1, 6);
    <span class="keywordtype">int</span> exp_year = 2003;
    <span class="keywordtype">int</span> exp_month = 1;
    <span class="keywordtype">int</span> exp_day = 6;
    <span class="keywordtype">int</span> exp_dayofweek = 1;
    <a name="a0"></a><a class="code" href="a00214.html#ad412a12981fa5ebe1b83ac1fb48585ef" title="A convenience type when mixing std::string in old compilers that are bad with namespaces...">String</a> exp_stringdate;
    <a name="a1"></a><a class="code" href="a00214.html#a7844b6bef86b8b2c8603678e72ef9854" title="Convenience type for struct tm.">tm_t</a> exp_dt;
    time_t exp_ctime;
    <span class="keywordtype">char</span> buf[20];

    snprintf(buf, <span class="keyword">sizeof</span>(buf),
        <span class="stringliteral">&quot;%04d-%02d-%02d&quot;</span>, exp_year, exp_month, exp_day);

    memset(&amp;exp_dt, 0, <span class="keyword">sizeof</span>(exp_dt));
    exp_dt.tm_year = exp_year - 1900;
    exp_dt.tm_mon = exp_month - 1;
    exp_dt.tm_mday = exp_day;
    exp_ctime = mktime(&amp;exp_dt);

    assert(exp_year == date[Date::year]);
    assert(exp_month == date[Date::month]);
    assert(exp_day == date[Date::day]);
    assert(exp_dayofweek == date[Date::dow]);

    <span class="comment">// test some conversions...</span>
    exp_stringdate = date();
    assert(<a name="a2"></a><a class="code" href="a00214.html#ae8329c8eceb3e760d48253f1c3386623" title="Compare two socket addresses to see if equal.">eq</a>(*exp_stringdate, <span class="stringliteral">&quot;2003-01-06&quot;</span>));
    date.get(buf);
    assert(<a class="code" href="a00214.html#ae8329c8eceb3e760d48253f1c3386623" title="Compare two socket addresses to see if equal.">eq</a>(buf, <span class="stringliteral">&quot;2003-01-06&quot;</span>));
    assert(exp_ctime == date.getTime());
    
    <span class="comment">// some operator tests...</span>
    Date aday = date;
    Date nextday(2003, 1, 7);
    assert(aday == date);
    assert((++aday) == nextday);
    assert(aday != date);
    assert(date &lt;= aday);
    assert(date &lt; aday);

    <span class="comment">// play with math and casting operators...</span>
    Date newday = nextday + 5l;
    assert((<span class="keywordtype">long</span>)newday == 20030112l);
    assert((<span class="keywordtype">long</span>)nextday == 20030107l);
    assert(newday - nextday == 5);

    <span class="comment">// test some math...</span>
    assert(20030106l == date.get());
    date -= 6;
    assert(20021231l == date.get());

    <span class="comment">// test invalid date...</span>
    date = <span class="stringliteral">&quot;20031306&quot;</span>;
    assert(!<a name="a3"></a><a class="code" href="a00214.html#aa074f1a5a7f2741a51a01bc1607fb4a6" title="Convenience function to validate object assuming it is castable to bool.">is</a>(date));

    <span class="comment">// conversion check...</span>
    date = <span class="stringliteral">&quot;2003-08-04&quot;</span>;
    assert((<span class="keywordtype">long</span>)date == 20030804l);

    DateTimeString dts(<span class="stringliteral">&quot;2003-02-28 23:59:55&quot;</span>);
    <a class="code" href="a00214.html#ae8329c8eceb3e760d48253f1c3386623" title="Compare two socket addresses to see if equal.">eq</a>((<span class="keyword">const</span> <span class="keywordtype">char</span> *)dts, <span class="stringliteral">&quot;2003-02-28 23:59:55&quot;</span>);

    DateTime tmp(<span class="stringliteral">&quot;2003-02-28 23:59:55&quot;</span>);
    snprintf(buf, <span class="keyword">sizeof</span>(buf), <span class="stringliteral">&quot;%.5f&quot;</span>, (<span class="keywordtype">double</span>)tmp);
    assert(<a class="code" href="a00214.html#ae8329c8eceb3e760d48253f1c3386623" title="Compare two socket addresses to see if equal.">eq</a>(buf, <span class="stringliteral">&quot;2452699.99994&quot;</span>));
    assert((<span class="keywordtype">long</span>)tmp == 20030228l);
    tmp += 5;   <span class="comment">// add 5 seconds to force rollover...</span>
    assert((<span class="keywordtype">long</span>)tmp == 20030301l);

    <span class="keywordflow">return</span> 0;
}

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