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DateToJD ( thedate ; gregorian )

converts a date into a Julian Day number

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Theo Ros - Show more from this author

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

/* ---------------------------------------------------------- Returns a Julian Daynumber for date in 'thedate' this number is based on November 24 -4713 (=day zero Gregorian) which is January 1 -4712 (January 1 4713 BC) Julian. In: thedate - a FileMaker Date field. if empty, the function uses the current date gregorian - optional: if <> 0 or empty use Gregorian calendar if 0 use Julian calendar defaults to Gregorian calendar Return type: Number Syntax: DateToJD ( thedate ) Return type: Number DateToJD ( Get ( CurrentDate ) ; 1 ) returns 2453521 if today is May 30, 2005 Author - Theo Ros ----------------------------------------------------------*/ Let ( [ dte = If ( IsEmpty ( thedate ) ; Get ( CurrentDate ) ; thedate ) ; y = Year ( dte ) ; m = Month ( dte ) ; d = Day ( dte ) ; jm = Int ( ( 14 - m ) / 12 ) ; // first calculate for the Julian calendar jd = d + Int ( 367 * ( m + ( jm * 12 ) - 2) / 12 ) + Int ( 1461 * ( y + 4800 - jm ) / 4 ) - 32113 ] ; // if needed, correct this for the Gregorian calendar If ( IsEmpty ( gregorian ) or gregorian <> 0 ; jd - ( Int ( 3 * Int ( ( y + 100 - jm ) / 100) / 4 ) - 2 ) ; jd ) ) Click to copy

Returns a Julian Daynumber for date in 'thedate'
this number is based on November 24 -4713 (=day zero Gregorian)
which is January 1 -4712 (January 1 4713 BC) Julian.

In: thedate - a FileMaker Date field.
if empty, the function uses the current date
gregorian - optional: if <> 0 or empty use Gregorian calendar
if 0 use Julian calendar
defaults to Gregorian calendar

Return type: Number
Syntax: DateToJD ( thedate )
Return type: Number

 

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