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DateByNthDOW ( tYear ; tMonth ; tDayOfWeek ; tNum )

Pick Nth day of week in specified year and month.

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Koji Takeuchi - Show more from this author TonicNote, Inc. https://tonicnote.com

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

/*--------------------------------------------------------- DateByNthDOW ( tYear ; tMonth ; tDayOfWeek ; tNum ) 2011.03.02, Koji Takeuchi <takeuchi@nemoux.com> 「○年○月の○番目の○曜日」の日付を得る Pick Nth day of week in specified year and month. tYear = Year // 2011 or Year ( date_value ) tMonth = Month // 3 or Month ( date_value ) tDayOfWeek = Day of week // "Thursday" or "thu" or "5" tNum = Number // 1-5 ex: Pick 2nd Thursday in 2011/03. DateByNthDOW ( 2011 ; 3 ; "thu" ; 2 ) = date value of "2011/3/10" ---------------------------------------------------------*/ Let ( [ tDOW_lower = Lower ( TrimAll ( RomanHankaku ( tDayOfWeek ) ; 1 ; 3 ) ) ; tDOW = Case ( Filter ( tDOW_lower ; "1234567" ) = tDOW_lower and tDOW_lower ≤ 7 ; tDOW_lower ; PatternCount ( tDOW_lower ; "sun" ) ; 1 ; PatternCount ( tDOW_lower ; "mon" ) ; 2 ; PatternCount ( tDOW_lower ; "tue" ) ; 3 ; PatternCount ( tDOW_lower ; "wed" ) ; 4 ; PatternCount ( tDOW_lower ; "thu" ) ; 5 ; PatternCount ( tDOW_lower ; "fri" ) ; 6 ; PatternCount ( tDOW_lower ; "sat" ) ; 7 ; "?" ) ; StartDate = Date ( tMonth ; 1 ; tYear ) ; StartDOW = DayOfWeek ( StartDate ) ; tStartDate = StartDate + tDOW - StartDOW + ( tDOW < StartDOW ) * 7 ; tDate = tStartDate + ( tNum - 1 ) * 7 ] ; Case ( tDOW = "?" ; tDOW ; GetAsDate ( tDate ) ) ) Click to copy

DateByNthDOW ( tYear ; tMonth ; tDayOfWeek ; tNum )
2011.03.02, Koji Takeuchi

「○年○月の○番目の○曜日」の日付を得る
Pick Nth day of week in specified year and month.

tYear = Year // 2011 or Year ( date_value )
tMonth = Month // 3 or Month ( date_value )
tDayOfWeek = Day of week // "Thursday" or "thu" or "5"
tNum = Number // 1-5

ex:
Pick date value of 2nd Thursday in 2011/03.
DateByNthDOW ( 2011 ; 3 ; "thu" ; 2 ) = date value of "2011/3/10"

 

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