secondsSinceEpoch..Root.time.secondsSinceEpochReturns a number of seconds that have elapsed since 00:00:00 Thursday, 1 January 1970 (see explanation on Wikipedia)
Interesting fact - Year 2038 problem.
IntNativeCallable, Callable
import("time");
log(time.secondsSinceEpoch());
time.sleep(2000);
log(time.secondsSinceEpoch());