Understanding the days of the week associated with specific dates is a common task in data analysis and scheduling. I’ve found that the VBA WEEKDAY function in Excel can be incredibly handy for this purpose. With this function, I can easily convert any given date into its corresponding weekday number, which ranges from 1 (Sunday) to 7 (Saturday). It’s like having an automated calendar at my fingertips that can instantly tell me whether a particular date falls on a Monday or a Friday, for example.

Utilizing the WEEKDAY function helps me streamline tasks and organize data more effectively. For instance, when I work on payroll systems or reporting mechanisms that depend on the day of the week, I can automate date-related calculations without needing to manually look up each day. This not only saves me time but also reduces the chances of human error. It’s a simple, yet powerful tool to manage dates within my VBA macros.

Syntax

Here’s how I write it:

Weekday(Date, [FirstDayOfWeek])

Arguments

In VBA, when I use the Weekday function, I work with two main parameters:

  • Date: The date value I’m converting to a weekday. It needs to be a proper date because if it’s not, the function might not work as expected.

  • [FirstDayOfWeek]: This lets me specify which day to consider as the start of the week. It’s pretty flexible:

    Value Effect
    (Omitted) vbSunday is default, beginning the week.
    vbUseSystemDayOfWeek Uses the system calendar setting.
    vbMonday to vbFriday Sets respective day as the week’s start.

This optional argument takes a string, and if I skip it, Sunday is the automatic pick. The [FirstDayOfWeek] input directly affects the integer returned – it’ll be a number from 1 to 7 relating to days of the week, with the chosen first day as 1.

Example

Sub example_WEEKDAY()
    Range("B1").Value = Weekday(Range("A1"))
End Sub

In this snippet of VBA code, the Weekday function fetches the weekday number from a date located in cell A1. When I ran it with the date for Wednesday, May 15, 2019, it returned the number 4 in cell B1. This return value indicates that Wednesday is the fourth day of the week because Weekday by default considers Sunday as the first day.

  • Cell A1 contains: 5/15/2019 (Wednesday)
  • Return value in Cell B1: 4
Cell Function Return Value
A1 Date Input 5/15/2019
B1 Weekday No. 4

The return value directly corresponds to the weekday number of the date given in cell A1. In my example, refer to cell B1 for the result.

Notes

  • Day of the Week: In VBA, we can find the weekday name using the WeekdayName function.
  • Error Handling: I ensure error handling for non-date types to prevent a runtime error 13.
  • System Settings: My formulas respect your system’s locale settings; whether that’s Gregorian or Hijri.
  • Constants: Days like Monday or Sunday are referenced by constants, with vbSunday as the default.
  • Functions: I use MsgBox to display results, and DateDiff to perform date calculations.
  • Templates: Looping and filtering in Excel templates, I simplify tasks with downloadable content.
  • Support: For any questions, I’ll look up the FAQs or use developer support for access issues.
  • Calculations: My formula ensures accurate results, confirming the last day of the week efficiently.

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