# Excel WEEKDAY Function

The Excel WEEKDAY function takes a date and returns a number between 1-7 representing the day of week. By default, WEEKDAY returns 1 for Sunday and 7 for Saturday, but this is configurable. You can use the WEEKDAY function inside other formulas to check the day of week.

*serial_number*- The date for which you want to get the day of week.*return_type*- [optional] A number representing day of week mapping scheme. Default is 1.

The WEEKDAY function takes a date and returns a number between 1-7 representing the day of the week. The WEEKDAY function takes two arguments: *serial_number* and *return_type*. *Serial_number* should be a valid Excel date in serial number format. *Return_type* is an optional numeric code that controls which day of the week is considered the first day. By default, WEEKDAY returns 1 for Sunday and 7 for Saturday, as seen in the table below:

Result | Meaning |
---|---|

1 | Sunday |

2 | Monday |

3 | Tuesday |

4 | Wednesday |

5 | Thursday |

6 | Friday |

7 | Saturday |

WEEKDAY supports several numbering schemes, controlled by the *return_type *argument. *Return_type* is optional and defaults to 1. The table below shows available *return_type *codes, the numeric result of each code, and which day is the first day in the mapping scheme.

Return type | Numeric result | Day mapping |
---|---|---|

none |
1-7 | Sunday-Saturday |

1 | 1-7 | Sunday-Saturday |

2 | 1-7 | Monday-Sunday |

3 | 0-6 | Monday-Sunday |

11 | 1-7 | Monday-Sunday |

12 | 1-7 | Tuesday-Monday |

13 | 1-7 | Wednesday-Tuesday |

14 | 1-7 | Thursday-Wednesday |

15 | 1-7 | Friday-Thursday |

16 | 1-7 | Saturday-Friday |

17 | 1-7 | Sunday-Saturday |

*Note: the WEEKDAY function will return a value even when the date is empty. Take care to trap this result if blank dates are possible.*

### Examples

By default and without a value fore *return_type*, WEEKDAY starts counting on Sunday:

To configure WEEKDAY to start on Monday, set *return_type* to 2*:*

In the example shown above, the formula in D5 (copied down) is:

=WEEKDAY(B5) // Sunday start

The formula in E5 (copied down) is:

=WEEKDAY(B5,2) // Monday start

### Notes

- By default, WEEKDAY returns 1 for Sunday and 7 for Saturday.
- WEEKDAY returns a value (7) even if the date is empty.

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