“Need to know which dates fall in week 10? Our tool gives you the exact Monday start and Sunday end in seconds.”
How to Get the Date Range for Any Week Number
Planning a project? Need to know exactly which dates fall into week 10 of 2026? Our calculator gives you the Monday start and Sunday end dates for any ISO week number and year.
Using the Tool
- Enter the year.
- Enter the week number (1–53).
- Click "Current Week" to auto‑fill today's year and week.
- Get the start and end dates, and see the week highlighted in the calendar.
ISO Week Rules
- Weeks start on Monday, end on Sunday.
- Week 1 is the week containing the first Thursday of the year.
- Some years have 53 weeks.
The tool automatically handles edge cases, like week 1 of 2026 starting in December 2025.
Example Use Cases
- Planning a 4‑week project starting in week 10.
- Scheduling team meetings for a specific week.
- Generating weekly reports for a given week number.
Frequently Asked Questions
What if I enter an invalid week number?
The calculator returns the nearest valid week (e.g., week 54 becomes week 53).
Why does week 1 sometimes start in the previous year?
Because the ISO week definition allows the first week to include days from December of the previous year.
Can I use this for any year, past or future?
Yes, the tool works for any year from 0000 to 9999 (JavaScript's date range).