How to get Unix timestamp in C#

Hello everyone! I'm a beginner C# developer, and I've encountered a problem working with dates and times. I need to get a Unix timestamp — the number of seconds that have passed since January 1, 1970 (Unix epoch). This is needed for integration with an external API that accepts time in this format. I tried something like: ```csharp DateTime now = DateTime.Now; long timestamp = (long)now; // Error: cannot implicitly convert ``` But the compiler gives an error that DateTime cannot be converted to long. Then I tried using the Ticks property: ```csharp long timestamp = DateTime.Now.Ticks; ``` But the value turns out to be huge (e.g., 638700000000000000), and this is clearly not a Unix timestamp. I understand that Ticks counts from January 1, 0001, not from 1970. Please tell me how to get