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How do I convert a Gregorian Calendar Date to a Julian Calendar Date?

I would like to be able to know how to convert a "Gregorian Calendar Date" to a "Julian Calendar Date", at least the Month and date. I'm aware there are about 3 different descriptions for "Julian Dates", i.e. 5 and 7 digit numbers. What I seek, is if I enter December 25, the resulting Month and date will be January 7 (before the Gregorian year 2101, then it calculates to January 8). My interest is for the study of Holiday Observances, and I'm aware that the Julian Calendar Date (which uses the same months as the Gregorian) is currently 13 days behind the Gregorian Calendar Date, e.g. for the day of this posting,

Gregorian: 12/26 = Julian 12/13

One example is that many across the World still observe Christmas by the Julian Calendar Date, December 25, which currently results in January 7 (until 2100 A.D.) by the Gregorian Calendar Date.

Thanks, Cliff