Time zones and DateTime parsing

I have the code:
DateTime dt1 = DateTime.Parse("11:19:00");
DateTime dt2 = DateTime.Parse("5.5.2005 11:19:00Z");
DateTime dt3 = DateTime.Parse("2005-1-1T11:19:00Z");
string s = dt1.Hour + " : " + dt2.Hour + " : " + dt3.Hour;
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