May 19, 2042 (Monday) to May 25, 2042 (Sunday)
Week 21 of 2042 runs from May 19, 2042 (Monday) to May 25, 2042 (Sunday). This is the 21th week of the year according to the ISO 8601 standard, in which weeks start on Monday.
May 19 is a Monday. It is the first day of Week 21 of 2042.
May 25 is a Sunday. It is the last day of Week 21 of 2042.
May 19 is in Week 21 of 2042 according to ISO 8601.
May 25 is in Week 21 of 2042 according to ISO 8601.
Week 21 of 2042 runs from May 19, 2042 to May 25, 2042.
Week 21 of 2042 starts on May 19, 2042, the 139th day of 2042.
Yes, all 7 days of Week 21 of 2042 fall within 2042.
2042 has 52 weeks according to ISO 8601.