| Now | |
| Julian Date | |
| Julian Day Number | |
| Chronological Julian Day | |
| Reduced Julian Day | |
| Modified Julian Day | |
| Truncated Julian Day | |
| Lilian Day Number | |
| Rata Die | |
| Gregorian Date |
See also http://en.wikipedia.org/wiki/Julian_day and http://www.tondering.dk/claus/calendar.html.