`StaticFileContext` constructor throws exception

[anfomin]

StaticFileContext has variable _lastModified. It's type changed from DateTime to DateTimeOffset some time ago. But constructor has invalid initialization at line 61:

_lastModified = new DateTime();

This should be:

_lastModified = new DateTimeOffset();

[pranavkm]

@Tratcher, why are any of the fields initialized here at all - https://github.com/aspnet/StaticFiles/blob/dev/src/Microsoft.AspNet.StaticFiles/StaticFileContext.cs#L54-L69? None of these values including _lastModified are ever used in any code paths. Shouldn't we just yank out the initialization?

Edit: Nevermind. Didn't realize this was a value type.

[Tratcher]

Fixed.