Definition: "2009-10-26-10:00:01," it's a Unix timestamp, not a real number. It shows when and how much time elapsed on Jan 1st, 2009.
The word "2009102601" is a date in the format "YYYY-MM-DD HH:MM:SS". This is used to represent dates in Unix epoch timestamps, which are often used for storing and retrieving timestamps in various systems.
2009102601