Hi @louismai,
If you are getting any unseen or special character in field stime_from. It is better to replace all non alphanumeric characters in the field values and then convert to epoch like below.
| eval time_from = strptime(replace(stime_from, "[\W]+", ""), "%Y%m%dT%H%M%S%N")
Examples:
| makeresults | eval stime_from="2020-03-04T23:01:58.500000000Z", time_from = strptime(replace(stime_from, "[\W]+", ""), "%Y%m%dT%H%M%S%NZ")
...
| makeresults | eval stime_from="2020-03-04T23:01:58.500000000", time_from = strptime(replace(stime_from, "[\W]+", ""), "%Y%m%dT%H%M%S%N")
... View more