What timezone are we using to say if it's a day before a puppy's birth?

Hi! My account for Sotiris didn't get approved despite prompts, stating who the parents are, having his birth info filled in etc. I think this might be because it's not Tuesday yet in America, despite it being Tuesday where I live (Europe, specifically The Netherlands). For me it was a day before his birth, but it might not have gotten approved because of timezones.

What timezone are the CMs using to say if it's a day or not before the birth? Could this be added to the guidebook to make sure there's no confusion about it anymore due to different timezones? Thanks!

(or maybe the account wasn't approved for a totally different reason, but I really wouldn't know what it could be <3)