When building a profile based segment, you may see 'Program Join Date' and 'Sign up Date' in the drop down as segment attributes, both.
The difference is best illustrated with an example:
Assuming that today is 1.31.2020
If I segment is built by 'Program Join Date' of yesterday, the segment will end up with only the guests that jointed yesterday, 1.30.2020
If a segment is built by 'Sign Up Date' of yesterday, the segment will end up with ALL of the guests that joined on 1.31.XXXX regardless of calendar year, from the beginning of your program.
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