I see many business are open "9:00 AM till 6:00 PM" or offer specials from now "till Wednesday".
This is incorrect.
"Till" is a verb (to work the soil) or a noun (a cash drawer), not a way to indicate a period of time.
In the cases described above, you need to use "'til", which is a contraction for "until". (Notice the single L at the end of the word?)
It's that simple!
