Days of the Week in 2021
2021 began on a Friday and was a common year of 365 days. Its doomsday was Sunday, which is the weekday shared by 4 April, 6 June, 8 August, 10 October and 12 December that year.
15 June 2021
Day 166 of 2021 · ISO week 24 of 2021
15 June 2021 was a Tuesday. That was 1,879 days ago, which is 5 years.
Work it out in your head
Every year has a doomsday: the weekday shared by 4/4, 6/6, 8/8, 10/10, 12/12, 5/9, 9/5, 7/11, 11/7 and the last day of February. Learn the year's doomsday and any date is a short sum from the nearest anchor.
| Doomsday for 2021 | Sunday |
|---|---|
| Nearest anchor | 6/6 |
| Step from the anchor | +9 days |
| Step, modulo 7 | 2 |
| Result | Tuesday |
| Year | Years from 2021 |
|---|---|
| 2027 | 6 |
| 2032 | 11 |
| 2038 | 17 |
| 2049 | 28 |
Every month of 2021
The weekday each month opened and closed on. Between the two, every date in that month is a short count away, and the tool above gives it exactly.
| Month | 1st was a | Last day was a | Days |
|---|---|---|---|
| January | Friday | Sunday | 31 |
| February | Monday | Sunday | 28 |
| March | Monday | Wednesday | 31 |
| April | Thursday | Friday | 30 |
| May | Saturday | Monday | 31 |
| June | Tuesday | Wednesday | 30 |
| July | Thursday | Saturday | 31 |
| August | Sunday | Tuesday | 31 |
| September | Wednesday | Thursday | 30 |
| October | Friday | Sunday | 31 |
| November | Monday | Tuesday | 30 |
| December | Wednesday | Friday | 31 |
2021 at a glance
| 1 January | Friday |
|---|---|
| 31 December | Friday |
| Leap year | No, February had 28 days |
| Days in the year | 365 |
| ISO weeks | 52 |
| Doomsday | Sunday |
| Days since 1 January 2021 | 2,044 |
Using the doomsday for 2021
The doomsday for 2021 was Sunday. That single fact gives you ten dates for free: 4 April, 6 June, 8 August, 10 October and 12 December were all Sundays, and so were 9 May, 5 September, 11 July, 7 November and 28 February.
From any of those, count forwards or backwards to the date you want and take the remainder after dividing by seven. The working panel under the result does it for you on whatever date you enter, so you can check yourself while you learn the method.
Frequently asked questions
What day of the week was 1 January 2021?
A Friday. 2021 was a common year, so it ran to 365 days and ended on a Friday.
Was 2021 a leap year?
No. 2021 does not divide by four, so February had 28 days.
How old is someone born in 2021?
They turn 5 during 2026, or are 4 until their birthday. For an exact figure to the day, use the age calculator with the full date of birth.