Week Number Calculator
This tool uses the ISO 8601 standard to find what week of the year we are in or which week a specific date falls on.
What is ISO Week?
According to the ISO 8601 standard:
- A week starts on Monday.
- The first week of the year is the first week containing at least 4 days of that year (or the week containing the first Thursday of the year).
Key Information
- Week Number: Ranging from 1 to 52 (sometimes 53).
- Day of Year: Which day of the year from the beginning the selected date is.
Usage Areas
Week numbers are critically important especially in logistics, production planning, and finance sectors when "Weekly" reporting and targets are set.