December 30, 2041 (Monday) to January 5, 2042 (Sunday)
Week 1 of 2042 runs from December 30, 2041 (Monday) to January 5, 2042 (Sunday). This is the 1th week of the year according to the ISO 8601 standard, in which weeks start on Monday.
Dec 30 is a Monday. It is the first day of Week 1 of 2042.
Jan 5 is a Sunday. It is the last day of Week 1 of 2042.
Dec 30 is in Week 1 of 2042 according to ISO 8601.
Jan 5 is in Week 1 of 2042 according to ISO 8601.
Week 1 of 2042 runs from December 30, 2041 to January 5, 2042.
Week 1 of 2042 starts on December 30, 2041, the 364th day of 2041.
Yes, all 7 days of Week 1 of 2042 fall within 2042.
2042 has 52 weeks according to ISO 8601.