December 31, 2046 (Monday) to January 6, 2047 (Sunday)
Week 1 of 2047 runs from December 31, 2046 (Monday) to January 6, 2047 (Sunday). This is the 1th week of the year according to the ISO 8601 standard, in which weeks start on Monday.
Dec 31 is a Monday. It is the first day of Week 1 of 2047.
Jan 6 is a Sunday. It is the last day of Week 1 of 2047.
Dec 31 is in Week 1 of 2047 according to ISO 8601.
Jan 6 is in Week 1 of 2047 according to ISO 8601.
Week 1 of 2047 runs from December 31, 2046 to January 6, 2047.
Week 1 of 2047 starts on December 31, 2046, the 365th day of 2046.
Yes, all 7 days of Week 1 of 2047 fall within 2047.
2047 has 52 weeks according to ISO 8601.