Planning uses
Use weekday lookup for appointments, event scheduling, billing reminders, content calendars and deadline checks before moving to a full calendar page.
📅 Day finder
Weekday Calculator
Enter any date to find the weekday, weekend status, ISO week number and practical planning notes for appointments or deadlines.
Free browser utility: Inputs are processed locally in your browser. Results are planning references; confirm payroll, legal, tax, school, or contract deadlines with the relevant official source.
Run the calculator
Choose a date
Weekday and ISO week will appear here.
Deadline caution
If a deadline lands on a weekend or holiday, the official due date may move. Confirm rules with the relevant institution before relying on a date.
Related time and date tools
FAQ
How do I find what day of the week a date is?
Enter the date. The calculator uses the browser date object to return the weekday name and weekend status.
What is ISO week number?
ISO week numbering starts on Monday and assigns week 1 to the week containing the first Thursday of the year.
Are holidays included?
No. The tool identifies weekdays and weekends only; public holidays vary by country and organization.
Source snapshot: built from Omellody GSC/local proxy opportunity work, no external keyword-volume or tool-score claims. Formula and browser behavior reviewed 2026-05-19. Deployment changes are not judged in GSC until coverage reaches this date.