Addon:DateCalculator

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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:

1. a valid Gramps date
2. a positive or negative number (represents years)
3. a positive or negative tuple (years, months, days)

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 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"

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.

See also

• [[Gramps_Template:Version manual_Wiki_Manual_-_Entering_and_editing_data:_detailed_-_part_1#Editing_dates|Editing dates]]
• [[Gramps_Template:Version manual_Wiki_Manual_-_Reports_-_part_2#Formatting_Dates|Formatting Dates]]