Date calculators · Calendar lookups
Weekday Calculator
Find what day a date falls on, or plan around the third Thursday or last Friday of a month.
Your calculation
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Choose your dates.
Select your counting rules and calculate.
Calculation details
| Step | Value |
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How to use this calculator
Look up a date's weekday, or choose a year, month, weekday and occurrence. The year table shows that same monthly pattern: a date lookup uses its numbered occurrence, while a last-weekday lookup keeps the last rule.
A fifth occurrence may not exist in a month; the tool reports that explicitly rather than silently choosing a different date. The year table can be downloaded for planning recurring meetups or monthly checkpoints. These are calendar dates, without event times, public-holiday exceptions or invitations.
A worked example
The fourth Thursday of November 2026 is November 26. The fifth Monday of February 2026 does not exist; the last Monday is February 23.
Are historical weekdays based on local calendar adoption?
All dates use the Gregorian rules extended backward, also called the proleptic Gregorian calendar. The calculator does not model when a particular country switched calendars or skipped dates. Use a historical-calendar source for that kind of research.
Which calendar and years are supported?
These tools use Gregorian calendar dates for years 1–9999, without historical calendar-switch dates. They count dates, not elapsed hours. Today buttons use the current date in your browser's time zone.
What happens to my dates?
Calculations run on your device. Saving a calculation is optional and keeps it in this browser. A setup link contains the dates and settings you entered; anyone with the link can read them. Use one tab per saved calculator. Clear saved data from Privacy & settings.