MonthLen ( themonth ; theyear )

Returns the number of days in the given month of the given year

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Theo Ros - Show more from this author

Sample input:

MonthLen ( 2 ; 1900 )

Sample output:

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

/*-----------------------------------------------------------------------------------------
Returns the length of the month given in the year given

Return type: Number
Syntax: MonthLen ( themonth ; theyear )

In: themonth - integer value ( 1-12 ). If empty, the current
                        month is assumed
      theyear - the year to check (not a date, but an integer)
                      if theyear is earlier than 1583, the Julian Calendar
                      is assumed.
                      If empty, the current year is assumed

Theo Ros
-----------------------------------------------------------------------------------------*/

Let ( [ m = If ( IsEmpty ( themonth ) or themonth < 1 or themonth > 12 ; 
                  Month ( Get ( CurrentDate ) ) ; themonth ) ;
           y = If ( IsEmpty ( theyear ) ; Year ( Get ( CurrentDate ) ) ; theyear ) ] ;

  If ( y < 1583 ;  // in this year the Gregorian calendar was introduced
    // Julian calendar
    Case ( m = 2 ; 28 + ( Mod ( y ; 4 ) = 0 ) ;  // Julian Calendar leapyear?
               m < 7 ; 30 + Mod ( m ; 2 ) ; 
                            31 - Mod ( m ; 2 )
    ) ;
    // Gregorian calendar
    Day ( Date ( m + 1 ; 1 ; y ) - 1 )  
  )  
)

Because the MonthLength() function by Andrew Sasaki uses the Julian Calendar method of determining the leapyear, the results can be wrong.

This better function works for both the Julian and the Gregorian calendar

Returns the length of the month given in the year given

Return type: Number
Syntax: MonthLen ( themonth ; theyear )

In: themonth - integer value ( 1-12 ). If empty, the current
month is assumed
theyear - the year to check (not a date, but an integer)
if theyear is earlier than 1583, the Julian Calendar
is assumed.
If empty, the current year is assumed

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Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.

MonthLen ( themonth ; theyear )

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