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Get day name from date

Excel formula: Get day name from date
Generic formula 
TEXT(B4,"dddd")
Explanation 

If you need to get the day name (i.e. Monday, Tuesday, etc.) from a date, there are several options depending on your needs.

Do you just want to display the day name?

If you only want to display a day name, you don't need a formula – you can use a custom number format. Select the date, then go to Format cells (Ctrl + 1 or Cmd + 1)  > Custom, and enter one of these custom formats:

"ddd"  // "Wed"
"dddd" // "Wednesday"

Excel will display only the day name, but it will leave the date value intact.

Do you want to convert the date into a day name?

If you want to convert the date value to a text value, you can use the TEXT function with a custom number format like "ddd". The formula looks like this:

=TEXT(B4,"ddd")

The TEXT function converts values to text using the number format that you provide. Note that date is lost in the conversion, only the text for the day name remains.

A more flexible way to get a day name from a date

If you don't want to use a helper table, you can also map weekday number to a month name directly in the CHOOSE function like so:

=CHOOSE(WEEKDAY(B4),"Sun","Mon","Tue","Wed","Thu","Fri","Sat")

In this case, enter the weekday names you want to return (abbreviated or not) as values in CHOOSE, after the first argument. WEEKDAY will extract a weekday number, and CHOOSE  will use this number to return the nth value in the list. This works because WEEKDAY returns a number 1-7 that corresponds to a given day of the week. With default settings, Sunday = 1 and Saturday = 7. See WEEKDAY for more info.

CHOOSE is more work to set up, but it is also more flexible, since it allows you to map a date to any values you want (i.e. you can use values that are custom, abbreviated, not abbreviated, different language, etc.)

Author 
Dave Bruns

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