It's easy to identify the ending points of each version. Basically, a new day in-game for each one.
So, it would be as follows (always including the day I mention):
Version 1.2 (the first one) ended the night of Wednesday, June 25th
Version 1.21 ended after completing Thursday, June 26th
Version 1.22 lasted until Friday, June 27th
Version 1.23, which started with Act 2 (three weeks later), ended after completing Monday, July 21st
And finally, the current version (1.24) lasts until the end of Tuesday, July 22nd
It'll probably follow this same trend on future versions
I'm glad you're enjoying the game so far, and for any other matter, ask me freely. See you!