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Created attachment 1320 [details]
Demo of the problem
Please have a look at the attached example program. It contains multiple examples that don't work, and a working example with Parse instead of ParseExact. This is probably related to #992 ("DateTime.ParseExact disregards valid format string").
ParseExact with the format string "o" (roundtrip format) throws the FormatException "Invalid format string". As there are multiple throw statements with the same message, I couldn't find out from the 2.10.8 source code what the problem seems to be.
Already fixed in master