Intervals, not dates
This tool converts durations. It does not correlate calendars, reigns, eras, or disputed epoch dates.
Time instrument
Ancient time converter
Convert fixed ancient and modern time intervals from Egyptian, Mesopotamian, Greek, Roman, Indian, and Maya systems with source notes.
Conversion result
1
time
Primary source for the selected input: UCL Digital Egypt, measuring time.
A seasonal hour is not a sixty-minute hour. Egyptian, Greek, and Roman daylight hours often divided the changing interval from sunrise to sunset into twelve parts. Those variable hours are documented here but excluded from fixed conversion.
Schematic calendars
Thirty-day months and 360-day years are labelled conventions, not claims about the observed lunar or solar year.
Fixed relationships only
Long Count periods and astronomical subdivisions convert cleanly because their day relationships are explicit.