The following test cases use {{Birth date/sandbox}}:
International format (df=yes)
- 13, 2011(2011-Template:MONTHNUMBER-13)
- 22, 2008(2008-Template:MONTHNUMBER-22)
- 11, 1985(1985-Template:MONTHNUMBER-11)
- 23, 1898(1898-Template:MONTHNUMBER-23)
- 31, 1955(1955-Template:MONTHNUMBER-31)
- 29, 1956(1956-Template:MONTHNUMBER-29)
- 31, 1957(1957-Template:MONTHNUMBER-31)
- 30, 1958(1958-Template:MONTHNUMBER-30)
- 31, 1959(1959-Template:MONTHNUMBER-31)
- 30, 1960(1960-Template:MONTHNUMBER-30)
- 31, 1961(1961-Template:MONTHNUMBER-31)
- 31, 1962(1962-Template:MONTHNUMBER-31)
- 30, 1963(1963-Template:MONTHNUMBER-30)
- 31, 1964(1964-Template:MONTHNUMBER-31)
- 30, 1965(1965-Template:MONTHNUMBER-30)
- 31, 1966(1966-Template:MONTHNUMBER-31)
American format (mf=yes)
- 13 2011(2011-Template:MONTHNUMBER-13)
- 22 2008(2008-Template:MONTHNUMBER-22)
- 11 1985(1985-Template:MONTHNUMBER-11)
- 23 1898(1898-Template:MONTHNUMBER-23)
- 31 1955(1955-Template:MONTHNUMBER-31)
- 29 1956(1956-Template:MONTHNUMBER-29)
- 31 1957(1957-Template:MONTHNUMBER-31)
- 30 1958(1958-Template:MONTHNUMBER-30)
- 31 1959(1959-Template:MONTHNUMBER-31)
- 30 1960(1960-Template:MONTHNUMBER-30)
- 31 1961(1961-Template:MONTHNUMBER-31)
- 31 1962(1962-Template:MONTHNUMBER-31)
- 30 1963(1963-Template:MONTHNUMBER-30)
- 31 1964(1964-Template:MONTHNUMBER-31)
- 30 1965(1965-Template:MONTHNUMBER-30)
- 31 1966(1966-Template:MONTHNUMBER-31)
Default (International) format (no parameter)
- 13 2011(2011-Template:MONTHNUMBER-13)
- 22 2008(2008-Template:MONTHNUMBER-22)
- 11 1985(1985-Template:MONTHNUMBER-11)
- 23 1898(1898-Template:MONTHNUMBER-23)
- 31 1955(1955-Template:MONTHNUMBER-31)
- 29 1956(1956-Template:MONTHNUMBER-29)
- 31 1957(1957-Template:MONTHNUMBER-31)
- 30 1958(1958-Template:MONTHNUMBER-30)
- 31 1959(1959-Template:MONTHNUMBER-31)
- 30 1960(1960-Template:MONTHNUMBER-30)
- 31 1961(1961-Template:MONTHNUMBER-31)
- 31 1962(1962-Template:MONTHNUMBER-31)
- 30 1963(1963-Template:MONTHNUMBER-30)
- 31 1964(1964-Template:MONTHNUMBER-31)
- 30 1965(1965-Template:MONTHNUMBER-30)
- 31 1966(1966-Template:MONTHNUMBER-31)
What if both mf and df are set?
- 31, 1966(1966-Template:MONTHNUMBER-31)
- 13, 1999(1999-Template:MONTHNUMBER-13)
- 21, 1823(1823-Template:MONTHNUMBER-21)
- 25, 4(4-Template:MONTHNUMBER-25)
Bogus dates
- 31 1948(1948-Template:MONTHNUMBER-31)
- 31 1943(1943-Template:MONTHNUMBER-31)
- 31 1953(1953-Template:MONTHNUMBER-31)
- 31 1980(1980-Template:MONTHNUMBER-31)
- 31 1977(1977-Template:MONTHNUMBER-31)
- 777 1994(1994-Template:MONTHNUMBER-777)