I am getting date and time format as "Created_time =1649576166225" in raw log we have to convert. Please help me convert in readable format for all logs. Need to do any changes in input level or anything please help me
as @PickleRick said, the best approach is to leave the timestamp and all the other dates in original format so you can use them as timestamp or to compare dates.
When you need to display ine date you can use the eval command with the strftime function that disaplys a date in the format you prefer, for more infos see at https://docs.splunk.com/Documentation/SCS/current/SearchReference/DateandTimeFunctions#Usage_3
in few words: to dortma your date from epochtime to human readable YYYY-mm-dd HH:MM:SS you could use:
| eval Created_time=strftime(Created_time,"%Y-%m-%d %H:%M:%S")
Do not "convert" the value. Use fieldformat to display the field in a human-readable format but leave the original field as it is. You can also create a calculated field which would give you another field containing the rendered string value.
But the first and most important thing is - since this sems to be an excerpt from some json data - where is your _time field being extracted from? Is the created_time field the only field in the event or do you have other time-related fields? If so, which of them is most important?