Weekdays Around a Date

Show weekdays before/after a date. If a newspaper mentions
"last Friday," enter the issue's date and find Friday's date.

Date:   Days:  

Weekdays by Year

Show days of week for the same date over many years.
Determine a year for a partial date, like "Friday June 30."

Date:   Years:  

Estimated Age

Show year of birth for an age reported in a given year.
If age is 52 in 1967, what year were they born.

Year of Record:   Years Prior:  

Age / Birth Date

Calculate age, given birth and target dates,
or calculate birth date, given target date and age.

Birth:
Date:  
Age:  y m d  

French Republican Calendar

Convert dates to/from French Revolutionary calendar.