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What does the word within in the sentence below mean:
Please log on to Application Web within 5 July 2018 to accept the offer:
If today is 1 July then does it tell the reader that they should accept the offer in only one day which is from 0 am to 12 pm 5 July, or they can accept the offer no later than 5 July?
It's a deadline, so from now on until July 5th you need to accept.
It's not really idiomatic; a clearer way to phrase this would have been to say by 5th July. You would normally use within with a duration, such as within five days, whereas by is used with a specific point in time.
If you were only able to log in on July 5th it would have to be on July 5th, or perhaps during July 5th.
