JMeter: Timestamp human readable format : Excel or CSV timestamp

Uncomment in jmeter.properties file

#jmeter.save.saveservice.timestamp_format=yyyy/MM/dd HH:mm:ss.SSS

https://emtunc.org/blog/11/2011/setting-jmeter-timestamp-to-human-readable-format-in-logs/

or while running in command prompt override the parameter by giving the values like below.

https://stackoverflow.com/questions/41391083/jmeter-non-gui-mode-timestamp-date-format

jmeter -Jjmeter.save.saveservice.timestamp_format="yyyy/MM/dd HH:mm:ss" -n -t example.jmx -l example.csv