In reality, does submitting on June 30 vs July 1st or 2nd really make any difference?

[medadvicewanted]

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Wanted to submit it tonight but don't necessarily want to rush it and miss something in the application

 

[fogorvostan]

Literally 0 difference.

You start seeing in a difference when you're talking about months - for example, submitting in June vs. submitting in September

 

[htdt]

No difference at all. The 2nd batch is ready to be officially "mailed out" tomorrow so the earliest you can be is 3rd batch. Again, this is unlikely since they will need time to verify your transcript yada yada yada.
On the other hand, you might want to think about the July 4 weekend ahead. Do you want to take the long weekend off and not having to think about your AADSAS app? Will you be motivated enough to get back to work right after the holiday, or do you usually have to take a few extra days to get back to the grind? I personally push myself to submit a supp app tonight since I'll be leaving tomorrow for the weekend.