ISO 周为什么有时是 53 周？

2029 年有 52 个 ISO 周；当 1 月 1 日所在周的大部分天数落在下一年时，该年会有 53 周。

2029 年 ISO 周数 - 全年每周起止日期

2029 年按 ISO 8601 共有 52 周，第 1 周从 2029-01-01（周一）开始。

周次	开始（周一）	结束（周日）	年内天数区间
1	2029-01-01	2029-01-07	1–7
2	2029-01-08	2029-01-14	8–14
3	2029-01-15	2029-01-21	15–21
4	2029-01-22	2029-01-28	22–28
5	2029-01-29	2029-02-04	29–35
6	2029-02-05	2029-02-11	36–42
7	2029-02-12	2029-02-18	43–49
8	2029-02-19	2029-02-25	50–56
9	2029-02-26	2029-03-04	57–63
10	2029-03-05	2029-03-11	64–70
11	2029-03-12	2029-03-18	71–77
12	2029-03-19	2029-03-25	78–84
13	2029-03-26	2029-04-01	85–91
14	2029-04-02	2029-04-08	92–98
15	2029-04-09	2029-04-15	99–105
16	2029-04-16	2029-04-22	106–112
17	2029-04-23	2029-04-29	113–119
18	2029-04-30	2029-05-06	120–126
19	2029-05-07	2029-05-13	127–133
20	2029-05-14	2029-05-20	134–140
21	2029-05-21	2029-05-27	141–147
22	2029-05-28	2029-06-03	148–154
23	2029-06-04	2029-06-10	155–161
24	2029-06-11	2029-06-17	162–168
25	2029-06-18	2029-06-24	169–175
26	2029-06-25	2029-07-01	176–182
27	2029-07-02	2029-07-08	183–189
28	2029-07-09	2029-07-15	190–196
29	2029-07-16	2029-07-22	197–203
30	2029-07-23	2029-07-29	204–210
31	2029-07-30	2029-08-05	211–217
32	2029-08-06	2029-08-12	218–224
33	2029-08-13	2029-08-19	225–231
34	2029-08-20	2029-08-26	232–238
35	2029-08-27	2029-09-02	239–245
36	2029-09-03	2029-09-09	246–252
37	2029-09-10	2029-09-16	253–259
38	2029-09-17	2029-09-23	260–266
39	2029-09-24	2029-09-30	267–273
40	2029-10-01	2029-10-07	274–280
41	2029-10-08	2029-10-14	281–287
42	2029-10-15	2029-10-21	288–294
43	2029-10-22	2029-10-28	295–301
44	2029-10-29	2029-11-04	302–308
45	2029-11-05	2029-11-11	309–315
46	2029-11-12	2029-11-18	316–322
47	2029-11-19	2029-11-25	323–329
48	2029-11-26	2029-12-02	330–336
49	2029-12-03	2029-12-09	337–343
50	2029-12-10	2029-12-16	344–350
51	2029-12-17	2029-12-23	351–357
52	2029-12-24	2029-12-30	358–364

2029 年 ISO 周数总表

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