Short answer
Years with 53 calendar weeks
Explore every 53-week year from 1900 through 2100.
Short answer
The list is calculated from ISO rules and is also available as machine-readable data.
How it works
Filter a period, then open a full year view for exact dates.
Read the list and handle alternating schedules
The list calculates each year rather than assuming a fixed interval. Examples include 2020, 2026 and 2032. There are 71 years with 53 ISO weeks in a full 400-year Gregorian cycle; the supported 1900–2100 range covers only part of that cycle.
Week 53 and the following week 1 are both odd. A schedule tied to odd/even week numbers repeats the same parity at that boundary. A continuously alternating fortnightly schedule needs an anchor date; an ISO number alone does not define school or shift arrangements.