- This article is about the year 1900. For the film, see 1900 (film).
Year 1900 (MCM) was an exceptional common year starting on Monday (link will display the full calendar) of the Gregorian calendar, but a leap year starting on Saturday  of the Julian calendar. The Gregorian calendar was 12-day faster until Wednesday, Template:OldStyleDate, but 13-day faster since Thursday, Template:OldStyleDate, than the Julian calendar.
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- Year 1900 was a Julian leap year but not in the Gregorian Calendar (year was not divisible by 400), which caused Julian dates (used in Russia until 1919) to slip 13-days behind, after leapday 1900.
- ↑ "Calendar in year 1900 (Russia)" (Julian calendar, starting Saturday), webpage: Julian-1900 (Russia used the Julian calendar until 1919).