The following test cases use {{Birth date and age/sandbox}}:
International format (df=yes)
- 13 May 2011(2011-05-13) (age 12)
- 22 September 2008(2008-09-22) (age 15)
- 11 March 1985(1985-03-11) (age 39)
- 23 December 1898(1898-12-23) (age 125)
- 31 January 1955(1955-01-31) (age 69)
- 29 February 1956(1956-02-29) (age 68)
- 31 March 1957(1957-03-31) (age 67)
- 30 April 1958(1958-04-30) (age 66)
- 31 May 1959(1959-05-31) (age 64)
- 30 June 1960(1960-06-30) (age 63)
- 31 July 1961(1961-07-31) (age 62)
- 31 August 1962(1962-08-31) (age 61)
- 30 September 1963(1963-09-30) (age 60)
- 31 October 1964(1964-10-31) (age 59)
- 30 November 1965(1965-11-30) (age 58)
- 31 December 1966(1966-12-31) (age 57)
American format (mf=yes)
- May 13, 2011(2011-05-13) (age 12)
- September 22, 2008(2008-09-22) (age 15)
- March 11, 1985(1985-03-11) (age 39)
- December 23, 1898(1898-12-23) (age 125)
- January 31, 1955(1955-01-31) (age 69)
- February 29, 1956(1956-02-29) (age 68)
- March 31, 1957(1957-03-31) (age 67)
- April 30, 1958(1958-04-30) (age 66)
- May 31, 1959(1959-05-31) (age 64)
- June 30, 1960(1960-06-30) (age 63)
- July 31, 1961(1961-07-31) (age 62)
- August 31, 1962(1962-08-31) (age 61)
- September 30, 1963(1963-09-30) (age 60)
- October 31, 1964(1964-10-31) (age 59)
- November 30, 1965(1965-11-30) (age 58)
- December 31, 1966(1966-12-31) (age 57)
Default (International) format (no parameter)
- 13 May 2011(2011-05-13) (age 12)
- 22 September 2008(2008-09-22) (age 15)
- 11 March 1985(1985-03-11) (age 39)
- 23 December 1898(1898-12-23) (age 125)
- 31 January 1955(1955-01-31) (age 69)
- 29 February 1956(1956-02-29) (age 68)
- 31 March 1957(1957-03-31) (age 67)
- 30 April 1958(1958-04-30) (age 66)
- 31 May 1959(1959-05-31) (age 64)
- 30 June 1960(1960-06-30) (age 63)
- 31 July 1961(1961-07-31) (age 62)
- 31 August 1962(1962-08-31) (age 61)
- 30 September 1963(1963-09-30) (age 60)
- 31 October 1964(1964-10-31) (age 59)
- 30 November 1965(1965-11-30) (age 58)
- 31 December 1966(1966-12-31) (age 57)
What if both mf and df are set?
- December 31, 1966(1966-12-31) (age 57)
- September 13, 1999(1999-09-13) (age 24)
- May 21, 1823(1823-05-21) (age 200)
- December 25, 4(4-12-25) (age 2019)
Bogus dates
- 31 February 1948(1948-02-31) (age 76)
- 31 April 1943(1943-04-31) (age 81)
- 31 June 1953(1953-06-31) (age 70)
- 31 September 1980(1980-09-31) (age 43)
- 31 November 1977(1977-11-31) (age 46)
- 777 December 1994(1994-12-777) (age 29)