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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">time-1.4: A time library</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Safe Haskell</th><td>None</td></tr></table><p class="caption">Data.Time.Calendar</p></div><div id="table-of-contents"><p class="caption">Contents</p><ul><li><a href="#g:1">Days
</a></li><li><a href="#g:2">Gregorian calendar
</a></li></ul></div><div id="synopsis"><p id="control.syn" class="caption expander" onclick="toggleSection('syn')">Synopsis</p><ul id="section.syn" class="hide" onclick="toggleSection('syn')"><li class="src short"><span class="keyword">newtype</span> <a href="#t:Day">Day</a> = <a href="#v:ModifiedJulianDay">ModifiedJulianDay</a> {<ul class="subs"><li><a href="#v:toModifiedJulianDay">toModifiedJulianDay</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a></li></ul>}</li><li class="src short"><a href="#v:addDays">addDays</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a></li><li class="src short"><a href="#v:diffDays">diffDays</a> :: <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a></li><li class="src short"><a href="#v:toGregorian">toGregorian</a> :: <a href="Data-Time-Calendar.html#t:Day">Day</a> -> (<a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a>, <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a>, <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a>)</li><li class="src short"><a href="#v:fromGregorian">fromGregorian</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a></li><li class="src short"><a href="#v:fromGregorianValid">fromGregorianValid</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="../base-4.5.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="Data-Time-Calendar.html#t:Day">Day</a></li><li class="src short"><a href="#v:showGregorian">showGregorian</a> :: <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></li><li class="src short"><a href="#v:gregorianMonthLength">gregorianMonthLength</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a></li><li class="src short"><a href="#v:addGregorianMonthsClip">addGregorianMonthsClip</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a></li><li class="src short"><a href="#v:addGregorianMonthsRollOver">addGregorianMonthsRollOver</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a></li><li class="src short"><a href="#v:addGregorianYearsClip">addGregorianYearsClip</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a></li><li class="src short"><a href="#v:addGregorianYearsRollOver">addGregorianYearsRollOver</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a></li><li class="src short"><a href="#v:isLeapYear">isLeapYear</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="../base-4.5.1.0/Data-Bool.html#t:Bool">Bool</a></li></ul></div><div id="interface"><h1 id="g:1">Days
</h1><div class="top"><p class="src"><span class="keyword">newtype</span> <a name="t:Day" class="def">Day</a> </p><div class="doc"><p>The Modified Julian Day is a standard count of days, with zero being the day 1858-11-17.
</p></div><div class="subs constructors"><p class="caption">Constructors</p><table><tr><td class="src"><a name="v:ModifiedJulianDay" class="def">ModifiedJulianDay</a></td><td class="doc empty"> </td></tr><tr><td colspan="2"><div class="subs fields"><p class="caption">Fields</p><dl><dt class="src"><a name="v:toModifiedJulianDay" class="def">toModifiedJulianDay</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a></dt><dd class="doc empty"> </dd></dl><div class="clear"></div></div></td></tr></table></div><div class="subs instances"><p id="control.i:Day" class="caption collapser" onclick="toggleSection('i:Day')">Instances</p><div id="section.i:Day" class="show"><table><tr><td class="src"><a href="../base-4.5.1.0/Prelude.html#t:Enum">Enum</a> <a href="Data-Time-Calendar.html#t:Day">Day</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="../base-4.5.1.0/Data-Eq.html#t:Eq">Eq</a> <a href="Data-Time-Calendar.html#t:Day">Day</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="../base-4.5.1.0/Data-Data.html#t:Data">Data</a> <a href="Data-Time-Calendar.html#t:Day">Day</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="../base-4.5.1.0/Data-Ord.html#t:Ord">Ord</a> <a href="Data-Time-Calendar.html#t:Day">Day</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="../base-4.5.1.0/Text-Read.html#t:Read">Read</a> <a href="Data-Time-Calendar.html#t:Day">Day</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="../base-4.5.1.0/Text-Show.html#t:Show">Show</a> <a href="Data-Time-Calendar.html#t:Day">Day</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="../base-4.5.1.0/Data-Ix.html#t:Ix">Ix</a> <a href="Data-Time-Calendar.html#t:Day">Day</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="../base-4.5.1.0/Data-Typeable-Internal.html#t:Typeable">Typeable</a> <a href="Data-Time-Calendar.html#t:Day">Day</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="../deepseq-1.3.0.0/Control-DeepSeq.html#t:NFData">NFData</a> <a href="Data-Time-Calendar.html#t:Day">Day</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="Data-Time-Format.html#t:ParseTime">ParseTime</a> <a href="Data-Time-Calendar.html#t:Day">Day</a></td><td class="doc empty"> </td></tr><tr><td class="src"><a href="Data-Time-Format.html#t:FormatTime">FormatTime</a> <a href="Data-Time-Calendar.html#t:Day">Day</a></td><td class="doc empty"> </td></tr></table></div></div></div><div class="top"><p class="src"><a name="v:addDays" class="def">addDays</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a></p></div><div class="top"><p class="src"><a name="v:diffDays" class="def">diffDays</a> :: <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a></p></div><h1 id="g:2">Gregorian calendar
</h1><div class="top"><p class="src"><a name="v:toGregorian" class="def">toGregorian</a> :: <a href="Data-Time-Calendar.html#t:Day">Day</a> -> (<a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a>, <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a>, <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a>)</p><div class="doc"><p>convert to proleptic Gregorian calendar. First element of result is year, second month number (1-12), third day (1-31).
</p></div></div><div class="top"><p class="src"><a name="v:fromGregorian" class="def">fromGregorian</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a></p><div class="doc"><p>convert from proleptic Gregorian calendar. First argument is year, second month number (1-12), third day (1-31).
Invalid values will be clipped to the correct range, month first, then day.
</p></div></div><div class="top"><p class="src"><a name="v:fromGregorianValid" class="def">fromGregorianValid</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="../base-4.5.1.0/Data-Maybe.html#t:Maybe">Maybe</a> <a href="Data-Time-Calendar.html#t:Day">Day</a></p><div class="doc"><p>convert from proleptic Gregorian calendar. First argument is year, second month number (1-12), third day (1-31).
Invalid values will return Nothing
</p></div></div><div class="top"><p class="src"><a name="v:showGregorian" class="def">showGregorian</a> :: <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="../base-4.5.1.0/Data-String.html#t:String">String</a></p><div class="doc"><p>show in ISO 8601 format (yyyy-mm-dd)
</p></div></div><div class="top"><p class="src"><a name="v:gregorianMonthLength" class="def">gregorianMonthLength</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a> -> <a href="../base-4.5.1.0/Data-Int.html#t:Int">Int</a></p><div class="doc"><p>The number of days in a given month according to the proleptic Gregorian calendar. First argument is year, second is month.
</p></div></div><div class="top"><p class="src"><a name="v:addGregorianMonthsClip" class="def">addGregorianMonthsClip</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a></p><div class="doc"><p>Add months, with days past the last day of the month clipped to the last day.
For instance, 2005-01-30 + 1 month = 2005-02-28.
</p></div></div><div class="top"><p class="src"><a name="v:addGregorianMonthsRollOver" class="def">addGregorianMonthsRollOver</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a></p><div class="doc"><p>Add months, with days past the last day of the month rolling over to the next month.
For instance, 2005-01-30 + 1 month = 2005-03-02.
</p></div></div><div class="top"><p class="src"><a name="v:addGregorianYearsClip" class="def">addGregorianYearsClip</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a></p><div class="doc"><p>Add years, matching month and day, with Feb 29th clipped to Feb 28th if necessary.
For instance, 2004-02-29 + 2 years = 2006-02-28.
</p></div></div><div class="top"><p class="src"><a name="v:addGregorianYearsRollOver" class="def">addGregorianYearsRollOver</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a> -> <a href="Data-Time-Calendar.html#t:Day">Day</a></p><div class="doc"><p>Add years, matching month and day, with Feb 29th rolled over to Mar 1st if necessary.
For instance, 2004-02-29 + 2 years = 2006-03-01.
</p></div></div><div class="top"><p class="src"><a name="v:isLeapYear" class="def">isLeapYear</a> :: <a href="../base-4.5.1.0/Prelude.html#t:Integer">Integer</a> -> <a href="../base-4.5.1.0/Data-Bool.html#t:Bool">Bool</a></p><div class="doc"><p>Is this year a leap year according to the proleptic Gregorian calendar?
</p></div></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.11.0</p></div></body></html>
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