Day of Week Calculator
Find the weekday for any valid date.
Choose a date.
What this calculator does
Find a date’s weekday, day of year, and leap-year status using the Gregorian calendar.
Inputs and what they mean
- Date
- — date value.
How to use it
- Enter the dates, times, or schedule details.
- Adjust the available options for your situation.
- Review and copy the instant result.
Formula
The weekday is derived from the Gregorian calendar date; day of year counts elapsed calendar days from January 1.
Worked example
Find a weekday
September 14, 2026 falls on a Monday.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
Results depend entirely on the figures you enter and are rounded for display. They are for general information and education, not professional advice.
Common questions
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