How can we change segment interval in realtime tranquility task

Hi

I am using spark tranquility to process row events.

As per my knowledge task accepting event for current time only.Actually, I want to process data for the past.

How can I change segment interval of the task it means it will process past data and create the segment for past data.

My segment granularity is HOUR.

Thank you in advance.

Jitesh.