Day of Week Calculator
Find what day of the week any date falls on.
Thursday
28 May 2026
Thursday
Day of Week
5 / 7
Day Number (Sun=1)
148
Day of Year
217
Days Left in Year
Week 22
Approx. Week Number
Weekday
Type
No (365 days)
Leap Year
5 / 12
Month Number
About This Tool
The Day of Week Calculator tells you what day of the week any date falls on, along with additional calendar facts: day number within the year, days remaining in the year, week number, whether it is a weekday or weekend, and whether the year is a leap year.
All calculations happen instantly in your browser using JavaScript's native Date API. No data is sent to any server.
How to Use
- Select any date using the date picker.
- All calendar facts update instantly β no button required.
Use Cases
Historians verify what day of the week a historical event occurred. HR managers check whether a specific date is a weekday for payroll. Content creators plan publication dates around weekdays for better engagement.
FAQ
- What calendar system is used? β The Gregorian calendar, which is the internationally accepted civil calendar.
- Are historical dates (before 1970) supported? β Yes. JavaScript's Date object handles dates back to around 100 million days before the Unix epoch.