FirstDayThisWeek ( StartDay )
Date of first day of current week
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Date of Monday of this week
Function definition: (Copy & paste into FileMaker's Edit Custom Function window)
Returns the date of the first day of the current measurement week (work week?). StartDay can be hardcoded in the function or derived from a global field as might be used to set a preference.
Phil McGeehan, Poole, UK
Oct 27, 2016
I had issues if the date was a Sunday, it would calculate the first date this week as the next Monday, not the one at the beginning of the week.
This calculation met my needs much more accurately:
Div ( date - 1 ; 7 ) * 7 + 1
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