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03 · Connection
Month anchors
In a given year, all these reference dates share the same weekday. From one of them, count to the date you want.
How it works — step by step
Start with the matching pairs: 4/4, 6/6, 8/8, 10/10 and 12/12 (day/month). Then learn 9 May ↔ 5 September and 11 July ↔ 7 November. March uses 14 March.
| Month | Common year | Leap year |
|---|---|---|
| January | 3 | 4 |
| February | 28 | 29 |
| March | 14 | 14 |
| April | 4 | 4 |
| May | 9 | 9 |
| June | 6 | 6 |
| July | 11 | 11 |
| August | 8 | 8 |
| September | 5 | 5 |
| October | 10 | 10 |
| November | 7 | 7 |
| December | 12 | 12 |
January and February change in leap years: 4 January and 29 February instead of 3 January and 28 February. A year is leap if divisible by 4, except century years unless also divisible by 400. So 1900 and 2100 are common years; 2000 is leap.
- For 1981, the year anchor is Saturday = 7. So 12 December is a Saturday.
- For 25 December, the difference is 25 − 12 = 13 days. Remove one week: 13 − 7 = 6.
- Move six days forward from Saturday: Friday = 6. Or use 26 December, one day after the target.
Dates before an anchor work too: 1 May 1981 is 8 days before 9 May. 7 − 8 = −1; add 7 to get 6, Friday. Add or subtract whole weeks until your day number is between 1 and 7.
BDAY numbers the weekdays from Sunday = 1 to Saturday = 7. A remainder of 0 means Saturday when you turn a final weekday total into a day number.
Exercise
May 17, 1994
Given year anchor: 2 · Monday · Common year
This session only. Each exercise counts once.
Gregorian calendar, years 1–9999. Earlier dates are calculated using Gregorian rules extended backwards; historical local calendars may differ.