The time in コスタナイ is normally 9, 10 または 11 時間 ahead of the time in ニューヨーク, but because these time zones don't share the same start and end times for daylight saving time, the time in コスタナイ can for a short while be 10 時間 ahead of the time in ニューヨーク.
コスタナイ does not change between summer time and winter time.