Week 1 of 2021

January 4, 2021 (Monday) to January 10, 2021 (Sunday)

← Week 1 of 2021 Week 2 →
ISO Week Number
Week 1
2021 · Week 1 of 52 total weeks

What dates are in Week 1 of 2021?

Week 1 of 2021 runs from January 4, 2021 (Monday) to January 10, 2021 (Sunday). This is the 1th week of the year according to the ISO 8601 standard, in which weeks start on Monday.

Mon
Jan 4
Day 4
Tue
Jan 5
Day 5
Wed
Jan 6
Day 6
Thu
Jan 7
Day 7
Fri
Jan 8
Day 8
Sat
Jan 9
Day 9
Sun
Jan 10
Day 10
Starts January 4, 2021 Monday · Day 4
Ends January 10, 2021 Sunday · Day 10
Duration 7 days 2021 · 52-week year

📅 Nearby weeks in 2021

Week 1Week 2Week 3

📋 All 52 weeks in 2021

12345·678910·1112131415·1617181920·2122232425·2627282930·3132333435·3637383940·4142434445·4647484950·5152

📆 Week 1 in other years

Week 1 · 2020Week 1 · 2022

🔧 Related tools

Week Number Calculator Date to Week 2021 Full Calendar

❓ Related questions about Week 1 of 2021

What day of the week is Jan 4?

Jan 4 is a Monday. It is the first day of Week 1 of 2021.

What day of the week is Jan 10?

Jan 10 is a Sunday. It is the last day of Week 1 of 2021.

What is the ISO week number for Jan 4?

Jan 4 is in Week 1 of 2021 according to ISO 8601.

What is the ISO week number for Jan 10?

Jan 10 is in Week 1 of 2021 according to ISO 8601.

❓ Frequently asked questions about Week 1 of 2021

What dates are in Week 1 of 2021?

Week 1 of 2021 runs from January 4, 2021 to January 10, 2021.

Which day of the year does Week 1 start on?

Week 1 of 2021 starts on January 4, 2021, the 4th day of 2021.

Does Week 1 of 2021 fall entirely within 2021?

Yes, all 7 days of Week 1 of 2021 fall within 2021.

How many weeks are in 2021?

2021 has 52 weeks according to ISO 8601.