You can use the add() function and the '+' operator to add timestamps together.
For example:
toTimestamp('2019-02-03 05:19:28.871', 'yyyy-MM-dd HH:mm:ss.SSS') + (days(1) + hours(2) - seconds(10)) -> toTimestamp('2019-02-04 07:19:18.871', 'yyyy-MM-dd HH:mm:ss.SSS')
The toTimestamp() function takes in time zone as a parameter as well if you are not working with UTC times. More info can be found here