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<h1>datetime.cpp</h1><p>Example of date & 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 <http://www.gnu.org/licenses/>.</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 <<a class="code" href="a00204.html" title="Top level include file for the GNU uCommon C++ core library.">ucommon/ucommon.h</a>></span>
<span class="preprocessor">#include <stdio.h></span>
<span class="keyword">using namespace </span>UCOMMON_NAMESPACE;
<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="a00208.html#a9045ddbf2980f6330c065a6935f40161" 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="a00183.html#a2fea857c30e2c901566fcf45fac68ac5" 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">"%04d-%02d-%02d"</span>, exp_year, exp_month, exp_day);
memset(&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(&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="a00208.html#affb4ebc34459cfbe1d2965c178e52ee9" title="Compare two socket addresses to see if equal.">eq</a>(*exp_stringdate, <span class="stringliteral">"2003-01-06"</span>));
date.get(buf);
assert(<a class="code" href="a00208.html#affb4ebc34459cfbe1d2965c178e52ee9" title="Compare two socket addresses to see if equal.">eq</a>(buf, <span class="stringliteral">"2003-01-06"</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 <= aday);
assert(date < 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">"20031306"</span>;
assert(!<a name="a3"></a><a class="code" href="a00208.html#acf24ef988438eb342a8a348f19524e37" 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">"2003-08-04"</span>;
assert((<span class="keywordtype">long</span>)date == 20030804l);
DateTimeString dts(<span class="stringliteral">"2003-02-28 23:59:55"</span>);
<a class="code" href="a00208.html#affb4ebc34459cfbe1d2965c178e52ee9" 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">"2003-02-28 23:59:55"</span>);
DateTime tmp(<span class="stringliteral">"2003-02-28 23:59:55"</span>);
snprintf(buf, <span class="keyword">sizeof</span>(buf), <span class="stringliteral">"%.5f"</span>, (<span class="keywordtype">double</span>)tmp);
assert(<a class="code" href="a00208.html#affb4ebc34459cfbe1d2965c178e52ee9" title="Compare two socket addresses to see if equal.">eq</a>(buf, <span class="stringliteral">"2452699.99994"</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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