This template returns the number of weeks that have elapsed between two dates. If the second set of parameters is not included it will automatically calculate the days between a given date and today.
Usage
Each date can be entered in a single parameter, or each date can be entered as three parameters: year, month, day.
{age in weeks|month1=6|day1=14|year1=1946|month2=8|day2=19|year2=1946} → 9
{age in weeks|1946|6|14|1946|8|19} → 9
{age in weeks|1946-6-14|1946-8-19} → 9
{age in weeks|14 June 1946|Aug 19, 1946} → 9
{age in weeks|month1=11|day1=07|year1=2012} → 599
{age in weeks|7 November 2012} → 599
An error is shown if an entered date is not valid (1900 was not a leap year).
{age in weeks|31 January 1899|29 February 1900} → Error: Second date should be year, month, day
Combines functions of {Birth date}, {birth-date}, {birth date and age}, {birth year and age}, {death date}, {death-date}, {death date and age}, and {death year and age}.
To display approximate birth year and current age given a particular date (e.g. when a dated reference mentions the age of a person), only works for living people.