This template returns the number of days between two dates. If the second set of parameters is not included it will automatically calculate the days between a given date and today. To use type:

{{age in days|month1= |day1= |year1= |month2= |day2= | year2=}}, or with unnames parameters:
{{age in days|year1|month1|day1|year2|month2|day2}} or
{{age in days|year1|month1|day1}}