Welcome to week 1 of 2026!
What, week 1 of 2026 is in 2025? Yes: the "first week of 2026" starts on the Monday of the first week that has at least 4 days that fall in 2026, AKA the week with the first Thursday of the year.
Since years don't have an integer number of weeks, a "weekyear" has either 52 or 53 weeks - so you can say we have 'leap weeks' sometimes.
This is all laid out in ISO8601:
https://en.wikipedia.org/wiki/ISO_week_date
However, the nice thing about standards is that there's so many to choose from. Yes, there are also people who count differently. The Java docs for their utility classes to count weeks cheekily claims "the common definition" is one where a week starts on Sunday (and week 1 is the first week where *any* day falls into the new year): https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/time/temporal/WeekFields.html#field-summary . Do not believe their lies.
raboof
npub19p…w8hz3
2025-12-29 10:16:15 UTC
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npub19peuy69dxyn2vx8c8lqnr0ecuw8mrd6krxunsj7c69kd8w0kjhtqpw8hz3Seen on
wss://relay.momostr.pinkPublished at
2025-12-29 10:16:15 UTCEvent JSON
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"content": "Welcome to week 1 of 2026!\n\nWhat, week 1 of 2026 is in 2025? Yes: the \"first week of 2026\" starts on the Monday of the first week that has at least 4 days that fall in 2026, AKA the week with the first Thursday of the year.\n\nSince years don't have an integer number of weeks, a \"weekyear\" has either 52 or 53 weeks - so you can say we have 'leap weeks' sometimes. \n\nThis is all laid out in ISO8601:\nhttps://en.wikipedia.org/wiki/ISO_week_date\n\nHowever, the nice thing about standards is that there's so many to choose from. Yes, there are also people who count differently. The Java docs for their utility classes to count weeks cheekily claims \"the common definition\" is one where a week starts on Sunday (and week 1 is the first week where *any* day falls into the new year): https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/time/temporal/WeekFields.html#field-summary . Do not believe their lies.",
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