Find date given day and week
La Thăng asks:
I want to find day if given date and week, for example : if given Tuesday, 32th week, 2015 >>> how to use function to point out 4/8/2015 ?
Answer:
Formula in cell D6:
Formula in cell D13:
Explaining formula in cell D6
Step 1 - Calculate the first date of this year
DATE(YEAR(TODAY()), 1, 1) returns 42005
Step 2 - Subtract with the corresponding weekday number
The weekday function converts a date to a number ranging from 1 to 7, depending on when the week starts.
WEEKDAY(serialnumber, return_type)
If you live in the US the week in starts on Sundays, return_type is 1.
-WEEKDAY(DATE(YEAR(TODAY()), 1, 1), 1)
becomes WEEKDAY(42005, 1)
and returns 5. 42005 is 2015-01-01 and that day is a thursday.
Step 3 - Calculate and add the number of days from monday/week 1 to monday/(nth week -1)
+(7*(D5-1))
Example, 7*(32-1)
becomes
7*31 and returns 217.
Step 4 - Calculate and add weekday number
MATCH($D$4, {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}, 0)
If you week begins on sunday, this is the array you want to be using:
{"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}.
Example, Tue returns 3.
Step 5 - Add and subtract
42005-5+217+3 = 42220
42220 is 2015-08-04
Download excel *.xlsx file
Find date given day and week.xlsx
Tip! You can shrink the formula if you can convert the weekday to a number yourself.
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