How would April 17, 2015 be written in Russian, or 4.17.2015?
April 17, 2015 => 17 апреля 2015 г.
4.17.2015 => 17.04.2015
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4This is not just a Russian convention, but is used throughout Europe (and in fact most, but not all, of the world outside of North America). – KCd Jun 26 '15 at 16:57
Based on your additional question, there is a special (old-fashioned) way of writting dates that is currently used on a tombstones and railroad equipment. For instance, here's how May, 4 2006 will look like:
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So, in case of April 17, 2015 it will look like:
17 20 -- 15 IV
Just to be absolutely strict and specific, here is the direct link to CLDR, which specifies the date/time format for Russian locale: http://st.unicode.org/cldr-apps/v#/ru/Generic/