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<html><!-- #BeginTemplate "/Templates/tmpl.dwt" --><head><!-- #BeginEditable "doctitle" --> <title>PTypes: date/time: calendar</title><!-- #EndEditable --> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link rel="stylesheet" href="styles.css"></head><body bgcolor="#FFFFFF" leftmargin="40" marginwidth="40"><p><a href="../index.html"><img src="title-1.7.gif" width="213" height="34" alt="C++ Portable Types Library (PTypes) Version 1.7" border="0"></a> <hr noshade><!-- #BeginEditable "body" --> <p class="hpath"><a href="index.html">Top</a>: <a href="basic.html">Basic types</a>: <a href="time.html">Date/time</a>: Date/calendar manipulation</p><blockquote> <pre class="lang">#include <ptime.h>typedef large datetime;bool isleapyear(int year);int daysinmonth(int year, int month);int daysinyear(int year, int month);int dayofweek(datetime d);bool isdatevalid(int year, int month, int day);datetime encodedate(int year, int month, int day);bool decodedate(datetime d, int& year, int& month, int& day);</pre></blockquote><p><span class="def">bool isleapyear(int year)</span> determines whether <span class="lang">year</span> is a leap year.</p><p><span class="def">int daysinmonth(int year, int month)</span> returns the number of days in <span class="lang">month</span> (1 - 12). The parameter <span class="lang">year</span> is needed to determine whether it's a leap year in order to return the correct number of days for February. The returned value can be in the range 28 - 31. If <span class="lang">month</span> is out of the allowed range (1 - 12) this function returns 0.</p><p><span class="def">int daysinyear(int year, int month)</span> returns the number of days since the beginning of the <span class="lang">year</span> up to the <span class="lang">month</span> (1 - 12), inclusive. If <span class="lang">month</span> is 12 the function will return the total number of days in the <span class="lang">year</span>. If <span class="lang">month</span> is out of the allowed range (1 - 12) this function returns 0.</p><p><span class="def">int dayofweek(datetime d)</span> returns the day of the week (0 - 6) for the given date <span class="lang">d</span>. 0 corresponds to Sunday, 1 - Monday etc. This function does not check the value of <span class="lang">d</span> for validity, it always returns some result in the range 0 - 6.</p><p><span class="def">bool isdatevalid(int year, int month, int day)</span> checks the values of <span class="lang">year</span>, <span class="lang">month</span> and <span class="lang">day</span> for validity. This function takes into account that <span class="lang">day</span> must be in the correct range depending on <span class="lang">year</span> and <span class="lang">month</span>. Also, it checks whether <span class="lang">year</span> is in the allowed range 1 - 9999.</p><p><span class="def">datetime encodedate(int year, int month, int day)</span> returns a <span class="lang">datetime</span> value, i.e. the number of milliseconds since the beginning of the calendar up to the midnight of <span class="lang">month</span>/<span class="lang">day</span>/<span class="lang">year</span>. This value can then be added to the value returned by <span class="lang">encodetime()</span> to form the exact time stamp with millisecond precision, or it can be used alone as a calendar date value without the time correction.</p><p><span class="def">bool decodedate(datetime d, int& year, int& month, int& day)</span> is the inverse version of <span class="lang">encodedate()</span>: it breaks the value of <span class="lang">d</span> into its <span class="lang">year</span>, <span class="lang">month</span> and <span class="lang">day</span>. This function returns <span class="lang">false</span> if the value of <span class="lang">d</span> is invalid.</p><p class="seealso">See also: <a href="time.datetime.html">Datetime type</a>, <a href="time.time.html">Time manipulation</a></p><!-- #EndEditable --><hr size="1"><a href="../index.html" class="ns">PTypes home</a></body><!-- #EndTemplate --></html>⌨️ 快捷键说明
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