Epoch Time Conversion

JSON Web Token (JWT) tokens use so-called Epoch or Unix time to represent date/times, which is the number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT).

In .NET, you can convert DateTimeOffset to Unix/Epoch time via the two methods of ToUnixTimeSeconds and ToUnixTimeMilliseconds:

EpochTimeExamples.cs

var seconds = DateTimeOffset.UtcNow.ToUnixTimeSeconds();
var milliseconds = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();