submitting work permit extension application one day before expiry date

[AW2017]

The expiration date on my current document is July 31, and I submitted my extension application on July 30 at 10:23:53 p.m. EDT. IRCC use UTC to calculate deadlines. Now, I know. It means 10:23 PM EDT on July 30, 2024, is equivalent to 2:23 AM UTC on July 31, 2024.
my question is that: did my previous work permit expired as the 11:59 UTC July 30, 2024 or 11:59 UTC July 31, 2024 (today 6:59 PM EST). I know the calculation of UTC to EST and vice versa my question is regarding IRCC taking expiry date at the end of day or the end of the previous day?

 

[iVictor]

End of the day of course. You expiration dates is July 31 23:59:59

 

[AW2017]

I'm counting on what you said being accurate. The fact that I still haven't received the EX-WP letter is making me more anxious by the minute.