We are ingesting data using logstash http_poller, there is a date field which need to be subtracted with a default value (1970.01.01 00:00:00)
eg: result.timeworked : 1970.01.01 00:00:40
this field need to be subtracted with the default value(1970.01.01 00:00:00) , get the result as 40.
How do i achieve this? any advice on this please.