Mayan calendar converter

Please create a converter to convert dates from gregorgian calendar to all the 40 calendars available in the world. For example gregorgian calendar to Mayan calendar, gregorgian calendar to Chinese calendar etc.
You can also create a converter to tell what is the current date according to sumerian calendar, Egyptian calendar,roman calendar,mayan calendar,Chinese calendar,babylonians calendar,Greek calendar, Ethiopian calendar,Persian calendar,Aztec calendar,hindu calendar,Buddhist calendar,Jewish calendar,catholic calendar,christian calendar.