From a wedding date and birth date an age at marriage can be calculated. From a death age and date on gravestone an approximate birth date can be calculated. When you run the program a window like the one above is displayed. The details of which are shown below. You must first select what you want to calculate before you can enter any dates.
Date Of Birth Enter a known date of birth to calculate age at event or event date from age at event.
Date of Event This could be death, wedding or census etc. This is split into years, months and days. Any number may be entered up to 999 in each field and the calculation will still work. The three buttons allow you to select what you would like to calculate. When this is checked on pressing the Update button the result will be passed into the clipboard ready for pasting in to another program.