C# Tip Article

In my previous post How to get unix timestamp in C#, I explained how to use unix timestamp in C#. From .NET 4.6, unix timestamp conversion feature is now built-in. This feature supports unix timestamp represented by seconds or milliseconds. Here is the example for unix timestamp conversion.

// 1) Convert seconds unix timestamp to DateTimeOffset type (UTC):
long timestamp1 = 1629565973L;
var dt1 = DateTimeOffset.FromUnixTimeSeconds(timestamp1);  
//8/21/2021 5:12:53 PM GMT

// 2) Convert milliseconds unix timestamp to DateTimeOffset type (UTC):
long timestamp2 = 1629565973000L;
var dt2 = DateTimeOffset.FromUnixTimeMilliseconds(timestamp2); 
//8/21/2021 5:12:53 PM GMT

// 3) Convert current UTC time to unix timestamp in seconds
long secs = DateTimeOffset.UtcNow.ToUnixTimeSeconds();  
// 1629566869

// 4) Convert current UTC time to unix timestamp in milliseconds
long ms = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds(); 
// 1629566869086