now

now returns the current time as a unix time - the number of seconds elapsed since January 1st 1970.

Context	Type
Input	ignored
Output	a number collection with a single value

Examples

Set the status of sensors to 'faulty' if they haven't been updated in the last minute:

every 30 seconds
when
    object(type="sensor", $lastUpdate < now().minus(minutes=1))
then
    set("status","faulty")

Notes

If you use now() as part of a when clause, you will most likely need to also set an every clause in order to cause the when to be reevaluated periodically.