🔍 查找任意日期的周数
第26周
ISO 周数
周一 6月 22 – 周日 6月 28, 2026
| Week # | 周一 (Start) | 周日 (End) | 涵盖月份 | 季度 | 天 |
|---|
常见问题
What week number is it today?
今天处于 Week -- of 2026. ISO 周 start on 星期一 and end on 星期日.
How are ISO week numbers calculated?
ISO 8601 defines a week as starting on 星期一. Week 1 of a year is the week that contains the first 星期四 of the year (or equivalently, the week containing 一月 4th). This means 一月 1 can sometimes be in the last week of the previous year (Week 52 or 53).
How many weeks are in 2026?
2026 has 52 ISO 周. The year starts on 星期四, 一月 1, and ends on 星期四, 十二月 31. Week 1 of 2026 begins on 星期一, 十二月 29, 2025.
What is the difference between ISO week and calendar week?
ISO 周 (ISO 8601) always start on 星期一. In the US, calendar weeks often start on 星期日. This means an ISO week number may differ from a US-style week number by 1 depending on the day. OnlineCalendar.org uses ISO 8601 week numbering.
When does Week 1 of 2027 start?
ISO Week 1 of 2027 starts on 星期一, 一月 4, 2027 — because 一月 1, 2027 falls on a 星期五, and Week 53 of 2026 covers 12月 28, 2026 – 1月 3, 2027.