◷Free
ISO week date to calendar
Convert an ISO week-year, week and weekday into a Gregorian date.
The converter locates week one using January 4, then offsets by the supplied week and weekday. ISO year 2020, week 53 and weekday 5 map to the Gregorian date 2021-01-01.
How to use
- Enter your text, values, or image.
- Adjust the options and run the tool.
- Copy or download your result.
Worked example
Example input
ISO week-year: 2020 ISO week number: 53 Weekday (Monday=1): 5
Example result
{
"date": "2021-01-01"
}Limitations and details
Not every ISO year has week 53; nonexistent week combinations and results outside Gregorian years 0001–9999 are rejected.
Inputs and options
- ISO week-year
- Number · Minimum: 1 · Maximum: 9999
- ISO week number
- Number · Minimum: 1 · Maximum: 53
- Weekday (Monday=1)
- Number · Minimum: 1 · Maximum: 7
Frequently asked questions
Is this tool free and private?
Yes. All 300 tools are free in this phase. Processing happens in your browser; your input and files are not sent to our servers.