Correct the date format in Data.cs

[StudioLE]

https://github.com/teamtreedyn/Binoculars/blob/e0cf00e74b95c37f2ac07381bae780b42e9a1c58/Data.cs#L83

hh is currently reporting the hour as a 12 hour clock rather than 24 hour.

@brencass suggests using HH instead

@radumg suggests ISO8601 standard format

As we're targeting a global audience I think the inclusion of local time zone is definitely important.

[radumg]

As we're targeting a global audience I think the inclusion of local time zone is definitely important.

Of course - this is usually (& easily) handled by the client/display layer (the VM in MVVM) however, leaving the data uniform.