ZEF
Slang adding date literals to source
CPAN
Conversions from / to the Baháʼí calendar
CPAN
conversions from / to the Coptic calendar and from / to the Ethiopic calendar
CPAN
Conversions from / to the French Revolutionary calendar
CPAN
Conversions from / to the Hebrew calendar
CPAN
Arithmetic Variant of the Hijri Calendar
CPAN
Conversions from / to the Julian calendar
CPAN
conversions from/to the Maya calendar and from/to the Aztec calendar
CPAN
Conversions from / to the Persian calendar
ZEF
Provides names for month and weekday numbers (multilingual).