Thanks Riverkid for you help. Needing furthur confirmation, I want to make sure I can use the word "teen" to refer to the 2nd 10 days of a month like this:
"I'm calling to verify if my appointment is scheduled for the late teens of this month"? (Yike, that just doesn't sound right as soon as it was written!)
This is when I'm not sure the exact day but somewhere between 15~19th of the month (as in youngesters in that age range "late teens"). I have a feeling native speakers don't say that right?
Thanks for correcting "how" to "what".
Correction rules!
NT