Addon:DateCalculator
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This is a Third-party Addon. Please use carefully on data that is backed up, and help make it better by reporting any comments or problems to the author, or issues to the bug tracker |
The Date Calculator Gramplet allows you to do date math.
Enter at least one valid date for Expression 1 and Expression 2 then click the Calculate button.
An expression can be:
- a valid Gramps date
- a positive or negative number (represents years)
- a positive or negative tuple (years, months, days) Note that only a single leading negative sign is needed to indicate a negative tuple.
Note that at least one expression must be a date.
Contents
Usage
Select the Date Calculator Gramplet from the Gramplet menu.
Enter the desired expressions and press the Calculate to see the result.
Use the Clear button to start again.
Example usage
Assume that a headstone has only a date of death and age at death.
| RANEY | ||
|---|---|---|
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MOTHER Wife of Died & 3Ds. Blessed are the dead who die in the Lord |
 Source: Iowa Gravestone Photo Project |
FATHER Died & 7Ds I will behold thy face |
Enter a date in each field in the following format ( YYYY-MM-DD ).
Expression 1
Enter a starting date or an offset value (such as the date of the most recent birthday on a marriage license):
for the wife in the example gravestone, enter 14 Nov 1902
Expression 2
an offset tuple is in the form y,m,d
Example for "Aged 73Yrs. 4Mo. & 3Ds.", use "- 73, 4, 3"
Note that only a single leading negative sign is needed to indicate a negative tuple.
Result
Pressing the Calculate button returns 1829-07-11. When storing a date that's been calculated from a reference rather than a historical record, it is hard to be certain what methodology was used. So the results are an estimate. Annotate this by preceding the value with "calc abt"
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Initially, the Result field will contain the following usage hint: Enter an expression in the entries above and click Calculate. An expression can be: 1. a valid Gramps date 2. a positive or negative number, representing years 3. a positive or negative tuple, representing (years, months, days) Note that at least one expression must be a date. |