# Calculating 26 weeks from start date

#### nudepinksnake

##### New Member
Hi guys,

How can I create a formula that will calculate an end date for a period of 26 weeks when I already have a start date? The 26th week will always end on a friday. however, week one can be defined as any working day.

Thanks in advance!

### Excel Facts

Workdays for a market open Mon, Wed, Friday?
Yes! Use "0101011" for the weekend argument in NETWORKDAYS.INTL or WORKDAY.INTL. The 7 digits start on Monday. 1 means it is a weekend.

#### JoeMo

##### MrExcel MVP
Hi guys,

How can I create a formula that will calculate an end date for a period of 26 weeks when I already have a start date? The 26th week will always end on a friday. however, week one can be defined as any working day.

Thanks in advance!
If start date is in cell A1, this should give you the Friday 26 weeks later.
Code:
``=CHOOSE(WEEKDAY(26*7+A1,1),26*7+A1-2,26*7+A1-3,26*7+A1-4,26*7+A1-5,26*7+A1-6,26*7+A1,26*7+A1-1)``

#### Weaver

##### Well-known Member
I think this should work, for a date in A2

=A2+7*26+5-WEEKDAY(A2,2)

#### Teethless mama

##### Board Regular
=a1+182-weekday(a1+1)

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