Return seconds elapsed since the epoch. The epoch is 00:00:00 Coordinated Universal Time 01-01-1970.
tm is the result of calling
now(), the milliseconds representing that
time is returned. Otherwise, the current system time as seconds (with nanosecond precision) is returned.
let tm = now() now_seconds() // 1496675523.234862 now_seconds(tm) // 1494575520
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