int :dt-to-unix ( float $DATETIME )
int :dt-to-unix

Takes a DateTime value and returns its corresponding Unix Timestamp. When omitted, the value defaults to current time.

# :dt-to-unix example
:set &dt :dt-encode i2000 i07 i18 i06 i30 i00
:writeln s'2000-07-18 06:30:00'
:writeln s'DateTime:  ' $dt
:writeln s'Timestamp: ' :dt-to-unix $dt