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<h3 class="subtitle">A free/open-source library for quantitative finance</h3>
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<h1>Date and time calculations</h1><hr><a name="_details"></a><h2>Detailed Description</h2>
The concrete class <code><a class="el" href="class_quant_lib_1_1_date.html" title="Concrete date class.">QuantLib::Date</a></code> implements the concept of date. Its functionalities include:<p>
<ul>
<li>providing basic information such as weekday, day of the month, day of the year, month, and year;</li></ul>
<p>
<ul>
<li>comparing two dates to determine whether they are equal, or which one is the earlier or later, or the difference between them expressed in days;</li></ul>
<p>
<ul>
<li>incrementing or decrementing a date of a given number of days, or of a given period expressed in weeks, months, or years. </li></ul>

<p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Modules</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__calendars.html">Calendars</a></td></tr>

<tr><td class="memItemLeft" nowrap align="right" valign="top">&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__daycounters.html">Day counters</a></td></tr>

<tr><td colspan="2"><br><h2>Classes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">class &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_calendar.html">Calendar</a></td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">calendar class  <a href="class_quant_lib_1_1_calendar.html#_details">More...</a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">class &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_date.html">Date</a></td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Concrete date class.  <a href="class_quant_lib_1_1_date.html#_details">More...</a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="struct_quant_lib_1_1_date_generation.html">DateGeneration</a></td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Date-generation rule.  <a href="struct_quant_lib_1_1_date_generation.html#_details">More...</a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">class &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_day_counter.html">DayCounter</a></td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">day counter class  <a href="class_quant_lib_1_1_day_counter.html#_details">More...</a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">class &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_quant_lib_1_1_period.html">Period</a></td></tr>

<tr><td colspan="2"><br><h2>Typedefs</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef Integer&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__datetime.html#g91214837fb837828e91ce17de9eaa43c">Day</a></td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Day number.  <a href="#g91214837fb837828e91ce17de9eaa43c"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef Integer&nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__datetime.html#g84dee895910074cbc7d936c86c1abf3d">Year</a></td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Year number.  <a href="#g84dee895910074cbc7d936c86c1abf3d"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Enumerations</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">enum &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__datetime.html#gff46c5ae9385d20709bedade86edd368">BusinessDayConvention</a> { <br>
&nbsp;&nbsp;<a class="el" href="group__datetime.html#ggff46c5ae9385d20709bedade86edd368b6a37af780aa2b97f8bbdc4d149dae18">Following</a>, 
<a class="el" href="group__datetime.html#ggff46c5ae9385d20709bedade86edd368013e092c359f6031cc0563fd413ce707">ModifiedFollowing</a>, 
<a class="el" href="group__datetime.html#ggff46c5ae9385d20709bedade86edd368d5fb7521157d4d4a91012209d6c75847">Preceding</a>, 
<a class="el" href="group__datetime.html#ggff46c5ae9385d20709bedade86edd368ab4d046fac23bf67214cb5f3cf8387ee">ModifiedPreceding</a>, 
<br>
&nbsp;&nbsp;<a class="el" href="group__datetime.html#ggff46c5ae9385d20709bedade86edd3685fb8b90b7fdf1a3a228fbbc083e64547">Unadjusted</a>
<br>
 }</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Business Day conventions.  <a href="group__datetime.html#gff46c5ae9385d20709bedade86edd368">More...</a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">enum &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__datetime.html#ge34b763987dcf60c6c619d327b8c9dbb">Month</a> { <br>
&nbsp;&nbsp;<b>January</b> =  1, 
<b>February</b> =  2, 
<b>March</b> =  3, 
<b>April</b> =  4, 
<br>
&nbsp;&nbsp;<b>May</b> =  5, 
<b>June</b> =  6, 
<b>July</b> =  7, 
<b>August</b> =  8, 
<br>
&nbsp;&nbsp;<b>September</b> =  9, 
<b>October</b> =  10, 
<b>November</b> =  11, 
<b>December</b> =  12, 
<br>
&nbsp;&nbsp;<b>Jan</b> =  1, 
<b>Feb</b> =  2, 
<b>Mar</b> =  3, 
<b>Apr</b> =  4, 
<br>
&nbsp;&nbsp;<b>Jun</b> =  6, 
<b>Jul</b> =  7, 
<b>Aug</b> =  8, 
<b>Sep</b> =  9, 
<br>
&nbsp;&nbsp;<b>Oct</b> =  10, 
<b>Nov</b> =  11, 
<b>Dec</b> =  12
<br>
 }</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Month names.  <a href="group__datetime.html#ge34b763987dcf60c6c619d327b8c9dbb">More...</a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">enum &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__datetime.html#g6d41db8ba0ea90d22df35889df452ada">Frequency</a> { <br>
&nbsp;&nbsp;<a class="el" href="group__datetime.html#gg6d41db8ba0ea90d22df35889df452adad7764a2ea2518891555bd395faffb4da">NoFrequency</a> =  -1, 
<a class="el" href="group__datetime.html#gg6d41db8ba0ea90d22df35889df452ada96be73c339468e5d0d9aed7ccc384bcc">Once</a> =  0, 
<a class="el" href="group__datetime.html#gg6d41db8ba0ea90d22df35889df452ada508b18014c96e2d466c12b39d7f4e426">Annual</a> =  1, 
<a class="el" href="group__datetime.html#gg6d41db8ba0ea90d22df35889df452adad1a5868a1c314bb7f6ab68e2fa182b2d">Semiannual</a> =  2, 
<br>
&nbsp;&nbsp;<a class="el" href="group__datetime.html#gg6d41db8ba0ea90d22df35889df452adacb332c66d96dd68b145f78c14a704f5c">EveryFourthMonth</a> =  3, 
<a class="el" href="group__datetime.html#gg6d41db8ba0ea90d22df35889df452adab4fce358383d1822f7596659e00b07f7">Quarterly</a> =  4, 
<a class="el" href="group__datetime.html#gg6d41db8ba0ea90d22df35889df452ada91a5f14e7e96afbf6429a2549d6896e8">Bimonthly</a> =  6, 
<a class="el" href="group__datetime.html#gg6d41db8ba0ea90d22df35889df452ada075d775ff1bb75474c994bd94e9629f4">Monthly</a> =  12, 
<br>
&nbsp;&nbsp;<a class="el" href="group__datetime.html#gg6d41db8ba0ea90d22df35889df452ada1b3b68c6c6974a8e343ea8d8b66c107f">Biweekly</a> =  26, 
<a class="el" href="group__datetime.html#gg6d41db8ba0ea90d22df35889df452ada39017ed07c435bd4b739cda6bf3e5a35">Weekly</a> =  52, 
<a class="el" href="group__datetime.html#gg6d41db8ba0ea90d22df35889df452ada6b15f8b55b10fefe6300b2f3bf60ad78">Daily</a> =  365
<br>
 }</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Frequency of events.  <a href="group__datetime.html#g6d41db8ba0ea90d22df35889df452ada">More...</a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">enum &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__datetime.html#gdd9fe45e09605eee3e4a39c8a5c4476d">TimeUnit</a> { <b>Days</b>, 
<b>Weeks</b>, 
<b>Months</b>, 
<b>Years</b>
 }</td></tr>

<tr><td class="mdescLeft">&nbsp;</td><td class="mdescRight">Units used to describe time periods.  <a href="group__datetime.html#gdd9fe45e09605eee3e4a39c8a5c4476d">More...</a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">enum &nbsp;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__datetime.html#gec3d5ec6653b2c392d449500b8f5cb3a">Weekday</a> { <br>
&nbsp;&nbsp;<b>Sunday</b> =  1, 
<b>Monday</b> =  2, 
<b>Tuesday</b> =  3, 
<b>Wednesday</b> =  4, 
<br>
&nbsp;&nbsp;<b>Thursday</b> =  5, 
<b>Friday</b> =  6, 
<b>Saturday</b> =  7, 
<b>Sun</b> =  1, 
<br>
&nbsp;&nbsp;<b>Mon</b> =  2, 
<b>Tue</b> =  3, 
<b>Wed</b> =  4, 
<b>Thu</b> =  5, 
<br>
&nbsp;&nbsp;<b>Fri</b> =  6, 
<b>Sat</b> =  7
<br>
 }</td></tr>

</table>
<hr><h2>Typedef Documentation</h2>
<a class="anchor" name="g91214837fb837828e91ce17de9eaa43c"></a><!-- doxytag: member="QuantLib::Day" ref="g91214837fb837828e91ce17de9eaa43c" args="" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">typedef Integer Day          </td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>
Day number. 
<p>

</div>
</div><p>
<a class="anchor" name="g84dee895910074cbc7d936c86c1abf3d"></a><!-- doxytag: member="QuantLib::Year" ref="g84dee895910074cbc7d936c86c1abf3d" args="" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">typedef Integer Year          </td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>
Year number. 
<p>

</div>
</div><p>
<hr><h2>Enumeration Type Documentation</h2>
<a class="anchor" name="gff46c5ae9385d20709bedade86edd368"></a><!-- doxytag: member="QuantLib::BusinessDayConvention" ref="gff46c5ae9385d20709bedade86edd368" args="" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">enum BusinessDayConvention          </td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>
Business Day conventions. 
<p>
These conventions specify the algorithm used to adjust a date in case it is not a valid business day. <dl compact><dt><b>Enumerator: </b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" name="ggff46c5ae9385d20709bedade86edd368b6a37af780aa2b97f8bbdc4d149dae18"></a><!-- doxytag: member="Following" ref="ggff46c5ae9385d20709bedade86edd368b6a37af780aa2b97f8bbdc4d149dae18" args="" -->Following</em>&nbsp;</td><td>
Choose the first business day after the given holiday. </td></tr>
<tr><td valign="top"><em><a class="anchor" name="ggff46c5ae9385d20709bedade86edd368013e092c359f6031cc0563fd413ce707"></a><!-- doxytag: member="ModifiedFollowing" ref="ggff46c5ae9385d20709bedade86edd368013e092c359f6031cc0563fd413ce707" args="" -->ModifiedFollowing</em>&nbsp;</td><td>
Choose the first business day after the given holiday unless it belongs to a different month, in which case choose the first business day before the holiday. </td></tr>
<tr><td valign="top"><em><a class="anchor" name="ggff46c5ae9385d20709bedade86edd368d5fb7521157d4d4a91012209d6c75847"></a><!-- doxytag: member="Preceding" ref="ggff46c5ae9385d20709bedade86edd368d5fb7521157d4d4a91012209d6c75847" args="" -->Preceding</em>&nbsp;</td><td>
Choose the first business day before the given holiday. </td></tr>
<tr><td valign="top"><em><a class="anchor" name="ggff46c5ae9385d20709bedade86edd368ab4d046fac23bf67214cb5f3cf8387ee"></a><!-- doxytag: member="ModifiedPreceding" ref="ggff46c5ae9385d20709bedade86edd368ab4d046fac23bf67214cb5f3cf8387ee" args="" -->ModifiedPreceding</em>&nbsp;</td><td>
Choose the first business day before the given holiday unless it belongs to a different month, in which case choose the first business day after the holiday. </td></tr>
<tr><td valign="top"><em><a class="anchor" name="ggff46c5ae9385d20709bedade86edd3685fb8b90b7fdf1a3a228fbbc083e64547"></a><!-- doxytag: member="Unadjusted" ref="ggff46c5ae9385d20709bedade86edd3685fb8b90b7fdf1a3a228fbbc083e64547" args="" -->Unadjusted</em>&nbsp;</td><td>
Do not adjust. </td></tr>
</table>
</dl>

</div>
</div><p>
<a class="anchor" name="ge34b763987dcf60c6c619d327b8c9dbb"></a><!-- doxytag: member="QuantLib::Month" ref="ge34b763987dcf60c6c619d327b8c9dbb" args="" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">enum Month          </td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>
Month names. 
<p>

</div>
</div><p>
<a class="anchor" name="g6d41db8ba0ea90d22df35889df452ada"></a><!-- doxytag: member="QuantLib::Frequency" ref="g6d41db8ba0ea90d22df35889df452ada" args="" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">enum Frequency          </td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>
Frequency of events. 
<p>
<dl compact><dt><b>Enumerator: </b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" name="gg6d41db8ba0ea90d22df35889df452adad7764a2ea2518891555bd395faffb4da"></a><!-- doxytag: member="NoFrequency" ref="gg6d41db8ba0ea90d22df35889df452adad7764a2ea2518891555bd395faffb4da" args="" -->NoFrequency</em>&nbsp;</td><td>
null frequency </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gg6d41db8ba0ea90d22df35889df452ada96be73c339468e5d0d9aed7ccc384bcc"></a><!-- doxytag: member="Once" ref="gg6d41db8ba0ea90d22df35889df452ada96be73c339468e5d0d9aed7ccc384bcc" args="" -->Once</em>&nbsp;</td><td>
only once, e.g., a zero-coupon </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gg6d41db8ba0ea90d22df35889df452ada508b18014c96e2d466c12b39d7f4e426"></a><!-- doxytag: member="Annual" ref="gg6d41db8ba0ea90d22df35889df452ada508b18014c96e2d466c12b39d7f4e426" args="" -->Annual</em>&nbsp;</td><td>
once a year </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gg6d41db8ba0ea90d22df35889df452adad1a5868a1c314bb7f6ab68e2fa182b2d"></a><!-- doxytag: member="Semiannual" ref="gg6d41db8ba0ea90d22df35889df452adad1a5868a1c314bb7f6ab68e2fa182b2d" args="" -->Semiannual</em>&nbsp;</td><td>
twice a year </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gg6d41db8ba0ea90d22df35889df452adacb332c66d96dd68b145f78c14a704f5c"></a><!-- doxytag: member="EveryFourthMonth" ref="gg6d41db8ba0ea90d22df35889df452adacb332c66d96dd68b145f78c14a704f5c" args="" -->EveryFourthMonth</em>&nbsp;</td><td>
every fourth month </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gg6d41db8ba0ea90d22df35889df452adab4fce358383d1822f7596659e00b07f7"></a><!-- doxytag: member="Quarterly" ref="gg6d41db8ba0ea90d22df35889df452adab4fce358383d1822f7596659e00b07f7" args="" -->Quarterly</em>&nbsp;</td><td>
every third month </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gg6d41db8ba0ea90d22df35889df452ada91a5f14e7e96afbf6429a2549d6896e8"></a><!-- doxytag: member="Bimonthly" ref="gg6d41db8ba0ea90d22df35889df452ada91a5f14e7e96afbf6429a2549d6896e8" args="" -->Bimonthly</em>&nbsp;</td><td>
every second month </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gg6d41db8ba0ea90d22df35889df452ada075d775ff1bb75474c994bd94e9629f4"></a><!-- doxytag: member="Monthly" ref="gg6d41db8ba0ea90d22df35889df452ada075d775ff1bb75474c994bd94e9629f4" args="" -->Monthly</em>&nbsp;</td><td>
once a month </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gg6d41db8ba0ea90d22df35889df452ada1b3b68c6c6974a8e343ea8d8b66c107f"></a><!-- doxytag: member="Biweekly" ref="gg6d41db8ba0ea90d22df35889df452ada1b3b68c6c6974a8e343ea8d8b66c107f" args="" -->Biweekly</em>&nbsp;</td><td>
every second week </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gg6d41db8ba0ea90d22df35889df452ada39017ed07c435bd4b739cda6bf3e5a35"></a><!-- doxytag: member="Weekly" ref="gg6d41db8ba0ea90d22df35889df452ada39017ed07c435bd4b739cda6bf3e5a35" args="" -->Weekly</em>&nbsp;</td><td>
once a week </td></tr>
<tr><td valign="top"><em><a class="anchor" name="gg6d41db8ba0ea90d22df35889df452ada6b15f8b55b10fefe6300b2f3bf60ad78"></a><!-- doxytag: member="Daily" ref="gg6d41db8ba0ea90d22df35889df452ada6b15f8b55b10fefe6300b2f3bf60ad78" args="" -->Daily</em>&nbsp;</td><td>
once a day </td></tr>
</table>
</dl>

</div>
</div><p>
<a class="anchor" name="gdd9fe45e09605eee3e4a39c8a5c4476d"></a><!-- doxytag: member="QuantLib::TimeUnit" ref="gdd9fe45e09605eee3e4a39c8a5c4476d" args="" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">enum TimeUnit          </td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>
Units used to describe time periods. 
<p>

</div>
</div><p>
<a class="anchor" name="gec3d5ec6653b2c392d449500b8f5cb3a"></a><!-- doxytag: member="QuantLib::Weekday" ref="gec3d5ec6653b2c392d449500b8f5cb3a" args="" -->
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">enum Weekday          </td>
        </tr>
      </table>
</div>
<div class="memdoc">

<p>
Day's serial number MOD 7; WEEKDAY Excel function is the same except for Sunday = 7. 
</div>
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