How to convert long number format datetime to datetime?

I have a field that is datetime in long value: "action_date":636346116012468640
So i want to use date filter to convert it to Unix date time:
date {
match => [ "action_date", "what is date format?" ]

What does this value represent? Nanoseconds since some point in time...? Where does it come from?

It's nanoseconds value: see from:

The value of this property represents the number of 100-nanosecond intervals that have elapsed since 12:00:00 midnight, January 1, 0001 (0:00:00 UTC on January 1, 0001, in the Gregorian calendar), which represents DateTime.MinValue. It does not include the number of ticks that are attributable to leap seconds.

Okay. I don't think the date filter supports converting from such timestamps.

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