Let's just say if you buy the pass on 6th Feb, it'll end on 5th
Mar. Buy on 19th Mar, end 18th april.
Buy on 31st Jan, end on 28th Feb. (This is my guess).
This is unlike the last time where the stamp is valid for THAT
month ONLY. Now it can be used on any day in any month provided
u've bought it for one month.
Encoding 7 days in advance means that let's say u encode on 20th
Feb, u can let the pass start on 27th Feb at the max. The min
encoding is on the day itself. Buy on 20th, starting using on
20th.