I was just watching this video. At the end, they are promoting a t-shirt and say:

"The offer is valid through July 28th"

Now, I've heard this said before but never really given it much thought. It's not really used in the UK, we'd just say:

The offer is valid until...

The offer is valid up to, and including,...

The offer is valid [date 1] through to [date 2].

There is a similar question here: Through (inclusive/exclusive)

Is is grammatically correct or just an AmE colloquialism?

  • 3
    Possible duplicate of Through (inclusive/exclusive)
    – Smock
    Sep 2 '19 at 15:32
  • Is there a reason why you think something you’ve heard used before isn’t grammatical?
    – ColleenV
    Sep 2 '19 at 17:25
  • 1
    It's a word that's listed in dictionaries. Per Merriam-Webster's definition of sense 4 C of the preposition: "to and including // Monday through Friday." If one date through another date is fine, then omitting the first date is simply a way of using a phrase that's open-ended. So long as it's said before the end date, it will still be correct. Sep 2 '19 at 18:09
  • 1
    It just does not sound right to ommit "to", to my ear as a native BrE speaker
    – Gamora
    Sep 2 '19 at 18:12
  • 3
    @Bee As a native AmE, "through to" sounds entirely wrong. Sep 2 '19 at 21:09

This use of "through" with a date, meaning "up to and including" that date, is very common and wholly natural in US English. I gather it is less common in UK English.

Some examples:

  • I will be on vacation through Thursday.
  • He will be in a meeting through 2 pm.
  • The store will be open through the 21st.
  • The play will run though October 15th.

Merriam-Webster gives "to and including" as sense 4 C, and I see no reason to think this is not grammatical.

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