Day of Week Calculator
Find the weekday for a date or the first, third, fifth, or last weekday in a month
Date to convert.
Year for this pattern.
Month to search.
Weekday to find.
Occurrence to use.
Compare distance from this date.
- --
How Weekdays Are Calculated
Use date-to-weekday for one date, or weekday-in-month for recurring schedule patterns.
Gregorian calendar
Modern civil dates use the Gregorian calendar. The calculator reads local calendar dates without applying time-zone conversions.
Nth weekday patterns
Patterns such as third Monday or last Friday are found by stepping through the matching weekdays in the selected month.
Reference distance
The reference date lets the result show whether the selected weekday date is before, after, or on another planning date.
Day of Week Examples
Common weekday lookups for birthdays, deadlines, holidays, and recurring schedules.
What day was May 31, 2026?
May 31, 2026 is a Sunday, the 151st day of the year.
Third Monday of January 2026
The third Monday of January 2026 is January 19, 2026.
No fifth Monday
Some months only have four of a weekday. The calculator shows the available matching dates.
Day of Week Calculator FAQ
Answers about weekdays, nth weekdays, reference dates, and scheduling use cases.
What calendar does this day of week calculator use?
It uses the Gregorian calendar, which is the standard civil calendar used for modern dates. For historical dates before local Gregorian adoption, official records can differ by country.
Can I find the third Monday or last Friday of a month?
Yes. Switch to weekday in month, then choose the year, month, weekday, and occurrence. If a fifth weekday does not exist, the calculator shows the available dates instead of fabricating one.
Why is there a reference date?
The reference date lets the calculator show how many days and weeks the selected weekday date is before or after another planning date.
Does this replace the week number calculator?
No. This page answers weekday and nth-weekday questions. The week number calculator focuses on ISO week numbers and week-to-date conversion.
Can I use it for recurring scheduling?
Yes for simple patterns such as first Monday, third Thursday, or last Friday of a month. For business-day, holiday, or time-zone rules, use the related specialized calculators.