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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.The omission of ten days of calendar dates was necessitated by the astronomical error built up by the Julian calendar over its many centuries of use, due to its too-frequent leap years.
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Used in the first Roman calendar as well as in the Julian calendar (established by Julius Caesar in 45 B. E.) the confusing system of Kalends, Nones, and Ides continued to be used to varying degrees throughout the Middle Ages and into the Renaissance.
So, the Ides of March is just one of a dozen Ides that occur every month of the year.