Today I found a very entertaining error on
the Russian Railways website:

Yes, in February 2013 they have 29 (!) Days. Worst of all, having an extra day “shifts” all the other months through the days of the week one day in advance.
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It is interesting what is happening with the service orders and with the ACS "Express-3" as a whole. If in a couple of days they don’t get better, people booking tickets for March 1 will be unpleasantly surprised.
Wrote about the error at ticket@rzd.ru.
UPD : With ticket@rzd.ru, the answer came quite quickly - "The
information was transferred to the responsible department. Thank you for your vigilance. "
UPD 2 by
zotov : in fact, the days of the week when ordering are correct, the error is obviously in the calendar widget.
UPD 3 :
Bug fixed!