Can someone please recommend me some good American OJs/contest platforms that host frequent contests? The reason I am asking is because currently, I am mostly using Codeforces and AtCoder to do practice contests; however, due to the difference in time zones (I live in NA), the contests on these sites often conflict with other things in my life such as school/other work/sleep. For this reason, it also doesn't matter if you recommend a site that is not specifically American — as long as it more or less follows the American time zones.

Thanks in advance!