What date is ISO week 53, day 5 (Friday) of 2026?
Naming the exact weekday inside a week gives an exact date — this one lands in the following calendar year.
Worked from a fixed input so the numbers stay put: 2026-W53-5. Try your own on the home page.
ISO week 53 of 2026, Friday, is 2027-01-01.
- Calendar date
- 2027-01-01
- ISO year
- 2026
- ISO week
- 53
- ISO weekday
- 5 (Friday)
- Weeks in that ISO year
- 53
This ISO week falls in calendar year 2027, not 2026
ISO week 53 of 2026 lands on 2027-01-01, in 2027, because ISO weeks near a year boundary do not line up with January 1st.
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Not a general calendar or scheduling tool, and it does not know about business fiscal-year or retail 4-4-5 week numbering, which are different systems that also call themselves "week numbers." It has no concept of time of day or timezone — it operates on calendar dates only. Not for US-style "week of the month" or non-ISO week-start conventions (e.g. Sunday-start week numbering used by some US calendars).