Addon:DateCalculator

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The Date Calculator Gramplet allows you to do date math to assess estimating dates and ages in genealogical records.

Enter at least one valid date for the Reference Date or Date Range field

1. a valid Gramps date

and Date or offset +/-y or +/-y, m, d field which can be:

1. a date
2. a positive or negative number, representing years
3. a positive or negative list of values, representing years, months, days Note that only a single leading negative sign is needed to indicate a negative tuple.

then click the Calculate button.

Note that at least one field must be a date.

Usage

Select the Date Calculator Gramplet from the Gramplet menu.

Enter the desired Reference Date or Date Range in the first entry field and Date or offset +/-y or +/-y, m, d in the second entry field and press the Calculate to see the calculation in the Result field.

Use the Copy button to copy the Result field to the clipboard.

Use the Clear button to start again.

Example usage

Assume that a headstone has only a date of death and age at death.

RANEY
MOTHER Hannah M. Wife of William Raney Died Nov. 14, 1902 Aged 73Yrs. 4Mo. & 3Ds. Blessed are the dead who die in the Lord	Source: Iowa Gravestone Photo Project	FATHER William Raney Died Oct. 17, 1892 Aged 71 Yrs 2Mo & 7Ds I will behold thy face in righteousness I shall be satisfied when I awake with thy likeness

Enter a date in the first field using the following format ( YYYY-MM-DD ).

Reference Date or Date Range

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

Date or offset +/-y or +/-y, m, d

a positive or negative list of values, representing years, months, days

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 calculated 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"

Initially, the Result field will contain the following usage hint: Enter an expression in the entries above and click Calculate.

See also

• Editing dates
• Formatting Dates