How many work weeks left to or passed from the specific date in Excel

You easily can change these formulas to calculate the number of workweeks for weeks from Sunday to Saturday or any other workweek.

For workweeks from Monday to Sunday, do the following:

   1.   To calculate a number of full workweeks between two dates, do the following:

   1.1.   Calculate the next Monday from the start date:

= <start date> + 7 – WEEKDAY (<start date> + 7 - <day>)

where:

• the formula WEEKDAY () returns a number between 1 and 7 that corresponds to a particular day of the week. With default settings, 1 = Sunday, 2 = Monday, 3 = Tuesday, 4 = Wednesday, 5 = Thursday, 6 = Friday, and 7 = Saturday,
• day is the day of week that you want to find, to find next Monday, it should be 2.

For example, to calculate next Monday from the 1^st of June 2018 (it is Friday):

   1.2.   Calculate the Sunday before the end date:

= <end date> - WEEKDAY (<end date> - <day>)

For example, to calculate the Sunday before the 31^st of August 2018 (it is Friday):

   1.3.   Calculate the difference between calculated dates and then divide the number of days to 7. It is necessary to return only the integer portion of the division result and discard the remainder of the division result, so, use the QUOTIENT function:

= QUOTIENT (numerator, denominator)

where:

• numerator is a dividend, a number to be divided,
• denominator is a divisor, a number to divide by.

For this example:

= QUOTIENT (<last Sunday> - <first Monday>, 7)

   2.   If you need to calculate a number of complete work weeks passed from some date, use the formula:

= QUOTIENT (TODAY () - <first Monday>, 7)

where TODAY () calculates the current date.

For example, for the 1^st of August 2018:

   3.   If you need to calculate a number of complete work weeks left to some date, use the formula:

= QUOTIENT (<last Sunday> - TODAY (), 7)

For example, for the 1^st of August 2018:

So, summer 2018 contains 12 work weeks, from June 1^st to August 1^st there are 8 work weeks, from August 1^st to August 31^st there are 3 workweeks. The workweek from August 1^st to August 3^rd is not a full workweek, and, thus, was not counted.

See also this tip in French: Combien de semaines de travail restantes ou écoulées à partir de la date spécifique dans Excel.