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Calculating Month Number Based on Month Name

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As I am trying to expand my experiance, I'm trying to make calculations harder on myself so I can learn. Here is what I did with finding the month number from a Month Name:

Let (

list =  ValueListItems ( Get ( FileName ) ; "Month List" );

ValueCount ( Left (list ; Position ( list ; Month::SelectMonth ; 1 ; 1 ) + Length ( Month::SelectMonth ) ) )


SelectMonth Values:













I didn't want to hardcode any months even though I could have used a simple Case function; what other ways are there to calculate a month number based on its name?

Thanks and God Bless!


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I can think of several, but when you say you don't want to hardcode, it begs the question of language. You yourself have hardcoded the ENGLISH month names into a value list. What if the user is French?

Another question is the input method: in English, the first 3 letters of the month name are enough to identify the month. So if you limit yourself to English, you could use the same formula for short or full month name as the input, for example:

Let ( [

string = "janfebmaraprmayjunjulaugsepoctnovdec" ;

mmm = Left ( Input ; 3 )

] ;

Ceiling ( Position ( string ; mmm ; 1 ; 1 ) / 3 )


It wouldn't be too hard to compile a list of 12 month names in the current language, but I don't know the minimum length required to identify the month in each languages.

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I know the you own FM8 and not the Advanced version, but isn't to difficult to ask someone to make a black file with this custom inside...

This custom function makes what you want and is *NOT* depending from the used language.



MonthNameToMonth custom function

Author: Daniele Raybaudi

Format: MonthNameToMonth ( theMonthName ; start )


theMonthName - text

start - number (must be set to 1)

Returns the month number of the given monthName



date = Date ( start ; 1 ; 1 );

month = Month ( date )



start > 12 or IsEmpty ( theMonthName ) ; "?" ;

MonthName ( date ) = theMonthName ; month ;

MonthNameToMonth ( theMonthName ; start + 1 )



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