Start with the exact case
Choose the calculator that matches the real time question before reading the result. Find ISO week, week year and date range.
Week number calculator
Find ISO week, week year and date range.
All calculations run locally in your browser. The rule stays visible so the result can be checked later.
The German legal pages are the binding version; this page only explains how to use the tools.
What does this mean?
ISO week = week with Thursday in the relevant yearAll calculations run locally in your browser. The rule stays visible so the result can be checked later.
Result
The result appears here after calculation.
Notes
Find ISO week, week year and date range.
- All calculations run locally in your browser. The rule stays visible so the result can be checked later.
- The German legal pages are the binding version; this page only explains how to use the tools.
- Inputs are not sent to a server.
Context
When this calculator fits
Week number calculator: Find ISO week, week year and date range.
Practical example
Choose the calculator that matches the real time question before reading the result. Find ISO week, week year and date range.
What the result means
ISO week = week with Thursday in the relevant year
Common mistakes
- Start with the exact case
- Read the visible rule
- Check the next step
Next step
Use related calculators, print the result or hand the rule into the deadline pruefung when the date matters.
Questions
What should I check first for Week number calculator?
Check the start point, end point and counting rule before using exclusions, buffers or regional calendars.
Can I rely on the result as legal advice?
No. ChronoCalc is a calculation aid with visible assumptions and limits.
What should I document?
Save the result, rule, calendar profile, excluded days and build date when the date matters.
Read the visible rule
ChronoCalc shows the calculation rule and the assumptions that can change the final date.
Check the next step
Use related calculators, print the result or hand the rule into the deadline pruefung when the date matters.
Next step
Related calculators
All calculations run locally in your browser. The rule stays visible so the result can be checked later.