Today's date (month and day)? 12 25

Person #1 of 2:
What month and day were you born? 1 10
1/10/07 falls on day #10 of 365.
Your next birthday is in 16 day(s).

Person #2 of 2:
What month and day were you born? 5 1
5/1/07 falls on day #121 of 365.
Your next birthday is in 128 day(s).

Person #1's birthday is sooner.