You made my day

make (one's) day

To cause one to feel very happy; to be a very positive highlight of one's day. When my neighbors surprised me with homemade chocolate chip cookies, it really made my day. Getting compliments at work always makes my day!
See also: make
Farlex Dictionary of Idioms.

You made my day

and YMMD
sent. & comp. abb. Thanks, you made me happy today. You are very kind. YMMD.
See also: made
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • made my day, that/you've/he/she
  • make (one's) day
  • make day
  • make my day
  • Make my day!
  • make one's day
  • make somebody's day
  • make someone's day
  • scrumptious
  • GUI