| Computing birth date from monument transcriptions |
| 15 | INSTRUCTIONS | Jan |
| 16 | 1. Find the DAY of death in the left column. Treating this day as 0, | Feb |
| 17 | the day before as 1, the day before that as 2, etc., count up the | Mar |
| 18 | column the number days of life given. If you reach the top of the | Apr |
| 19 | column before you have finished counting, continue at the bottom | May |
| 20 | of the column. If the month preceding that of death has less than | Jun |
| 21 | 31 days, be sure to skip the unneeded days in the column. You now | Jul |
| 22 | have the date of birth. | Aug |
| 23 | 2. Find the MONTH of death in the lower month column at right: If | Sep |
| 24 | you went past the 1st while counting days, go back one month. | Oct |
| 25 | Just like with days, count this month as 0 & count up the column | Nov |
| 26 | the number of months of life. This gives you the month of birth. | Dec |
| 27 | 3. Take the YEAR of death. If you went past January while counting | Jan |
| 28 | months, subtract 1 from the year of death. Now subtract the | Feb |
| (29) | number of years of life from the year you have to get the year | Mar |
| (30) | of birth. | Apr |
| (31) | Leap years Any year evenly divisible by 4, except the century | May |
| 1 | years, unless they are divisible by 400 (1600 is a leap year) | Jun |
| 2 | remember that when you count back the days, you skip only 31 & 30 | Jul |
| 3 | instead of 31, 30 & 29, to correct the number of days in the month | Aug |
| 4 | Remember the rule: Thirty days hath Sept., April, June, & Nov. | Sep |
| 5 | EXAMPLE | Oct |
| 6 | Subject died 1 March 1896, aged 35 years, 7 months, 2 days. | Nov |
| 7 | 1. Starting with 1, treat this day as 0 & count back 2. The month | Dec |
| 8 | preceding March is February & this was a leap year; so we skip | |
| 9 | the 30 & 31. The day before March 1 was February 29. Treat the | |
| 10 | 29th as 1, etc. This lands us on 28. | |
| 11 | 2/We did go past the 1st, so starting with February in the month | |
| 12 | column, count up 7 months. This takes us to July. | |
| 13 | 3/We did go past January, so 1896 becomes 1895. Subtracting 35 from | |
| 14 | 1895 gives us 1860. Therefore the subject was born 28 July 1860 | |