How to see time in ~/.bash_history file

That's Unix Timestamp / Epoch time - number of seconds passed from January 1st, 1970.

If you convert it to datetime, you will get:

$ date -d @1570201804
Fri Oct  4 18:10:04 EAT 2019

In UTC it is 10/04/2019 @ 3:10pm (UTC) but since I am in East Africa, we get +3 time difference coming to 10/04/2019 @ 6:10pm (UTC)

I guess your timezone is +5:30