View source for Template:YMD2MJD

{{{{{subst|}}}#ifeq:{{{1|+}}}|{{{1|<noinclude>+</noinclude>}}}|{{{{{subst|}}}#expr:
<!-- Add days in Julian years for the specified Julian year (4-year cycles) (no default, or 1858 for the MJD epoch when viewing template page) -->
   floor(floor(
       floor(({{{1<noinclude>|1858</noinclude>}}})*12+({{{2|1<noinclude>1</noinclude>}}})-2.5)
   /12)*1461/4)
<!-- Add days since last March for the specified month (default 01, or 11 for the MJD epoch when viewing template page) -->
+floor(
   (   floor(({{{1<noinclude>|1858</noinclude>}}})*12+({{{2|1<noinclude>1</noinclude>}}})-2.5)
   - floor(
       floor(({{{1<noinclude>|1858</noinclude>}}})*12+({{{2|1<noinclude>1</noinclude>}}})-2.5)
     /12)*12+4
   )*153/5-122
 )
<!-- Add days in month (default 01, or 17 for the MJD epoch when viewing template page) -->
+({{{3|1<noinclude>7</noinclude>}}})-1
<!--
  Here we have the number days past, at the given date in the Julian calendar, since the
  beginning of the Julian BC/AD era (Julian 0001-01-01T00:00Z = Gregorian 0001-01-03T00:00Z).

  Transition from Julian to Gregorian is enabled by default when transcluding this template.
  Julian and Gregorian calendars coincide anywhere between 200-03-01 AD and 300-02-29 AD,
  so any transition date in that period will be smooth (the default transition year here
  is arbitrarily set to 250 AD, months and days do not matter). Any input date starting at
  the specified transition date will be computed as in the Gregorian calendar.
-->
<!-- Add days of correction for non-leap centenial years (400-year cycles) -->
{{#if:{{{yt|<includeonly>250</includeonly>}}}|
+(   floor(
       floor(({{{1<noinclude>|1858</noinclude>}}})*12+({{{2|1<noinclude>1</noinclude>}}})-2.5)
     /4800)<!-- number of months in 400 years -->
   - floor(
       floor(({{{1<noinclude>|1858</noinclude>}}})*12+({{{2|1<noinclude>1</noinclude>}}})-2.5)
     /1200)<!-- number of months in 100 years -->
 )*(   floor(({{{1<noinclude>|1858</noinclude>}}})*12+({{{2|1<noinclude>1</noinclude>}}})-2.5)
   >= ({{{yt|0<includeonly>250</includeonly>}}})*12
 )
+2
}}
<!-- Note that no smooth transition occurs starting this points, time elements are counted exactly -->
<!-- Add fractional days from time in day (default 00:00:00) -->
+({{{4|0}}})/24+({{{5|0}}})/1440+({{{6|0}}})/86400
<!-- Adjust for the MJD epoch -->
-678883<!-- JD(MJD epoch) - JD(CE era) - 0.5 = 2400000.5 - 1721117 - 0.5 = 678883 -->
}}|{{{{{subst|}}}Timestamp2MJD|({{{{{subst|}}}CURRENTTIMESTAMP}}round-6)|subst={{{subst|}}}}}}}<noinclude>{{documentation}}</noinclude>