RangesOverlap ( start1 ; end1 ; start2 ; end2 )

Check if two ranges of dates or numbers overlap (inclusive)

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Joshua Willing - Show more from this author
Willing Apps

Sample input:

RangesOverlap ( 1 ; 10 ; 5 ; 15 )

Sample output:

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

/**
 * RangesOverlap ( start1 ; end1 ; start2 ; end2 )
 * 
 * PURPOSE: 
 * 	- Check if ranges overlap
 * 
 * NOTES:
 * 	- Works for dates and/or numbers. Uses GetAsNumber so be careful about what you input
 * 
 * WARNING:
 * 	- Date strings like "11/23/2018" become 11232018. Be sure the input is an actual date type if you want to compare dates.
 * 
 * RESULT: 
 * 	1 if ranges overlap
 *	0 if they do not
 *	? if error
 *	
 * HISTORY:
 * 	2018-11-01	Joshua Willing
 * 		- Created
 * 
 */

Let ([
	start1 = GetAsNumber ( start1 ) ;
	end1 = GetAsNumber ( end1 ) ;
	start2 = GetAsNumber ( start2 ) ;
	end1 = GetAsNumber ( end1 )
];
	If ( 
		IsEmpty ( start1 ) or IsEmpty ( end1 ) or IsEmpty ( start2 ) or IsEmpty ( end2 );
			"?" ;
		// else
			end2 >= start1 and start2 <= end1
	)
		
)

This will return 1 or 0 depending on if the two ranges overlap. The inputs can be numbers or dates, but because the function uses GetAsNumber, be sure to input an actual date data type if using dates. Date strings like "11/23/2018" will be converted to 11232018, which will return unexpected results if you intended to compare dates.

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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.

RangesOverlap ( start1 ; end1 ; start2 ; end2 )

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