What format is the data in the clipt parameter?

I am trying to programatically generate YouTube embed URLs using standard YouTube URLs. I'm having trouble generating embed URLs for Clips. The clipt parameter is not listed in Google's documentation of YouTube embedded player parameters

https://www.youtube.com/embed/qVqV5T45QB0?clip=Ugkx97OCpf318BJnwKLlPj48mCBSes4MBD3w&clipt=EAAYiCc

The part after /embed/ is the ID of the original video. clip is the ID of the clip. clipt appears to be the start time and end time of the clip, however, I do not know what format this number is in. The embed URL above has a start and end time of 0:00.0 - 0:05.0.

• EAAY7Cc is the value for a start and end time of 0:00.0 - 0:05.1.
• EAAY0Cg is 0:00.0 - 0:05.2
• EAAYtCk is 0:00.0 - 0:05.3
• EAAYmCo is 0:00.0 - 0:05.4
• EAAY8C4 is 0:00.0 - 0:06.0
• EAAY2DY is 0:00.0 - 0:07.0
• EGQY8C4 is 0:00.1 - 0:06.0
• EMgBGPAu is 0:00.2 - 0:06.0
• EKwCGPAu is 0:00.3 - 0:06.0
• EOgHGPAu is 0:01.0 - 0:06.0

I have attempted to decode these numbers as base64, base58, base32, and base16; none of the outputs looked correct.

An explanation of the format for video IDs is available here. Even while using this document, I was unable to solve how to convert "0:00.0 - 0:05.0" to EAAYiCc