The current time (as reported by your browser) is:
- Unix time, Unix epoch
- The number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT), not counting leap seconds (in ISO 8601: 1970-01-01T00:00:00Z)
- Julian Day
- A continuous count of days and fractions since noon Universal Time on January 1, 4713 BCE (on the Julian calendar). Julian dates are widely used as time variables within astronomical software. Typically, a 64-bit floating point (double precision) variable can represent an epoch expressed as a Julian date to about 1 millisecond precision. Note that the time scale that is the basis for Julian dates is Universal Time, and that 0h UT corresponds to a Julian date fraction of 0.5.
- Modified Julian Date
- An abbreviated version of the old Julian Day (JD) introduced by space scientists in the late 1950's. It is defined as:
MJD = JD - 2400000.5Its the continuous count of days and fractions since midnight Universal Time on November 17, 1858 and is sometimes used as the number's are smaller than JD, especially on older software