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I read an essay once by Isaac Asimov about this fact .. and I remember that in russia they hadn't fully switched when he was born, but did before his family immigrated to America. By that time the loss was 13 days, and he ended the essay by saying, "Where are my thirteen days? Give me my thirteen days!"

For anyone looking for an interesting rabbit trail, they may want to read up on Eastern Orthodox calendars and their controversies; specifically, the Revised Julian calendar, which is effectively a more accurate Gregorian calendar.

https://en.wikipedia.org/wiki/Revised_Julian_calendar

This also explains the confusing naming of the two Russian revolutions: The February/March revolution, and the October/November revolution.

I guess these countries still follow the older calendar still for some church activities. This years Easter is yet to to happen in Russia, for example.