It is not possible to find a time where the entire globe is awake.
I normally use late evening in GMT - e.g. 11 PM (GMT+0).
Then would it be midnight in mine (and OP's time zone) GMT+1 .... and morning in US.
I can also recommend to use the code:
[time] <unix time here> [/time]
I never had a end-time confusion in my auctions after I started stating the end time in unix time with the time tag.
Will use that one for the next auction I'll hold. Thanks for the tip.
And I also agree with you mj, late evening here for me seems to be the best one, but lately I've only had EU winners in my auctions Haha.
However, if I do make another auction I'll consider it more carefully.
✌️