if a deadline says by a certain date ?

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https://english.stackexchange.com/questions/193777/meaning-of-by-when-used-with-dates-inclusive-or-exclusive

https://english.stackexchange.com/questions/193777/meaning-of-by-when-used-with-dates-inclusive-or-exclusive
Meaning of by when used with dates – inclusive or exclusive
1 To native speakers, there is no definitive interpretation. It could mean either up to and including, or strictly before. Which meaning it had in a specific context would depend upon the conventions governing that context, which can and do differ.

https://grammarhow.com/due-on-due-by-due-for

https://grammarhow.com/due-on-due-by-due-for
Due On, Due By, Or Due For? Difference Explained (+18 Examples)
When you want to announce the deadline day, it always comes after the preposition. That means you can say due on Friday or due by Tuesday next week. You can only put the deadline day after the preposition to indicate the urgency of the submission to the people you’re talking to.

https://www.quora.com / If-something-is-due-by-date-can-it-be-turned-in-on-the-date-or-does-it-have-to-be-turned-in-before-the-date?share=1

https://www.quora.com / If-something-is-due-by-date-can-it-be-turned-in-on-the-date-or-does-it-have-to-be-turned-in-before-the-date?share=1
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https://english.stackexchange.com/questions/276618/does-i-need-it-by-september-30th-mean-deadline-2400-the-30th-or-deadline-24

https://english.stackexchange.com/questions/276618/does-i-need-it-by-september-30th-mean-deadline-2400-the-30th-or-deadline-24
dates – Does I need it by September 30th mean deadline 24:00 the 30th …
1 This is what I’m struggling with most of times. Why they do not use such expressions: submit e-mail intent for proposal submission on or before September 30, 2015, – Eilia Sep 28, 2015 at 21:51 2 Normally it would mean in time for it to be acted upon before close of business on Sept 30.

https://english.stackexchange.com/questions/106167/before-date-versus-by-date

https://english.stackexchange.com/questions/106167/before-date-versus-by-date
prepositions – Before date versus by date – English Language …
Does it mean before the beginning or before the end of Monday? – FumbleFingers Mar 5, 2013 at 18:41 4 I object to this question being a duplicate. The linked question addresses the meaning of by Monday. My question is whether it is correct to say before Monday at all, and the meaning of it. – user2978 Mar 5, 2013 at 19:18

https://law.stackexchange.com/questions/3534/if-something-is-due-on-a-certain-day-does-it-mean-before-the-day-starts-or-the

https://law.stackexchange.com/questions/3534/if-something-is-due-on-a-certain-day-does-it-mean-before-the-day-starts-or-the
If something is due on a certain day, does it mean before the day …
3 Answers Sorted by: 3 In general, the words due on take on their ordinary meaning – that is, that the performance of a contract is required on or before the date specified. If it is not specified in the contract, a court will look to what is reasonable in the circumstances.

https://www.avvo.com/legal-answers/what-does-by-a-date-mean-legally–4328089.html

https://www.avvo.com/legal-answers/what-does-by-a-date-mean-legally–4328089.html
What does by a date mean legally? – Legal Answers – Avvo
Posted on Apr 18, 2019. It usually means by the close of business on June 1st, which would normally be 4:30 or 5:00 pm depending on the time the clerk’s office closes. 0 found this answer helpful | 0 lawyers agree. Helpful Unhelpful. 0 comments.

https://english.stackexchange.com/questions/38169/does-until-date-mean-before-that-date

https://english.stackexchange.com/questions/38169/does-until-date-mean-before-that-date
prepositions – Does until [date] mean before that date? – English …
8 Answers Sorted by: 16 My default reading of that would be that you can deliver the product at any time on the 18th of August, 2011 and still be considered to have met your deadline. If the deadline were 23:59 August 17, it would have been stated as (before August 18, 2011).

https://english.stackexchange.com/questions/56335/does-notified-by-date-include-the-end-date

https://english.stackexchange.com/questions/56335/does-notified-by-date-include-the-end-date
prepositions – Does notified by [date] include the end date …
If something is supposed to happen by a certain day, it means it is supposed to happen not later than that, so it includes the day as well. Share Improve this answer Follow answered Jan 29, 2012 at 22:18 user2683

https://dictionary.cambridge.org/us/dictionary/english/deadline

https://dictionary.cambridge.org/us/dictionary/english/deadline
DEADLINE | definition in the Cambridge English Dictionary
noun [ C ] uk / ˈdedlaɪn / us Add to word list the time or date by which something must be done: The application deadline is February 16. a deadline of March 21/5 o’clock/next Thursday, etc. We have already agreed a deadline of July 1 2011. a July/Monday/midnight deadline 900,000 applications were handed in by yesterday’s noon . lesoutrali bot