How to get or calc current timestamp in Unix Time (epoch) format?

How to get or calc current timestamp in Unix Time (epoch) format?

Hello.

I am looking for ways to get or to calculate current DateTime in Unix/Epoch Time format (seconds from 1970-01-01 00:00:00). 

Is it possible to convert the result of DTCurDate/DTCurTime? No problem with DTCurTime, but what format of DTCurDate?

Maybe you know other ways to do it?

Thanks in advance,
Maryan