Best Time (Chinese 最美的時光) is a 2013 Chinese television series based on the novel The Most Beautiful Time by Tong Hua. It aired on Hunan TV from 20 November to 22 December 2013.
Both are correct, however, In my experience what is the best time is more common. The questions amount to the same thing but have subtly different meanings. When is the best time ... The question here is choose the best time, now when is that time, you are choosing the time and then giving an attribute of the time — when.
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