Excel beginner weeknum dayname datefunctions

How to Determine Week Number and Day Name in Excel?

Week Number and Day Name is a Excel function that calculates the week number of a given date and returns the corresponding day name.. Formula Genius generates and validates this formula automatically from a plain-English prompt.

Understanding the week number and day name for a date can help in scheduling and planning. This formula provides both in one go.

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The Formula

Prompt

"Find which week number of the year a date falls in, and what day of the week it is (returning the day name)"

Excel 
=WEEKNUM(A1)&" - "&TEXT(A1,"dddd")

This formula calculates the week number of a given date and returns the corresponding day name.

Step-by-Step Breakdown

  1. WEEKNUM(A1) calculates the week number of the date in cell A1.
  2. TEXT(A1,"dddd") converts the date in A1 to its full day name.
  3. The ampersand (&) concatenates the week number and day name into a single string.
  4. Ensure the date in A1 is formatted correctly for accurate results.

Edge Cases & Warnings

  • If A1 is empty, the formula will return an error.
  • If A1 contains a non-date value, the formula will not work as expected.
  • Leap years may affect week number calculations depending on the week starting day.
  • Dates at the beginning of the year may return week 1 even if they are in the first few days.

Examples

Prompt

"A1 = 2023-03-15"

Excel 
11 - Wednesday
Prompt

"A1 = 2023-12-01"

Excel 
48 - Friday

Frequently Asked Questions

What does WEEKNUM function do?

WEEKNUM returns the week number of a specified date.

How can I change the start of the week?

You can specify the second argument in WEEKNUM to change the start day.

What format should the date be in?

The date should be in a recognizable Excel date format.

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