DateTime or DateTimeOffset?

[Tratcher]

The memory cache uses time-stamps based on DateTime. Security uses DateTimeOffset (and rounds to one second). Which one should memory cache be using and why?

@GrabYourPitchforks

[GrabYourPitchforks]

General rule of thumb: Public APIs should take DateTimeOffset because that type encourages correct usage patterns. Internally, the data can be stored as a UTC DateTime (or even an Int64) for the sake of performance.