when 和 time of 有什么区别？如果难以说明的话，请教我一下例句。

"When" is used to ask a question or to refer to a time when someone did something.

"When are you going?" 「いつが行きますか。」
"I had many friends when I was a child." 「子供のごろ、友達がたくさんいました。」
"I visited Tokyo Tower when I went to Japan."
「日本へ旅行した時には東京タワーを見に行きました。」

You use "time of" to refer to a period during which an event occurs.
"When was the time of birth?" 「出産時はいつですか。」
"The hottest time of the year" 「一年で一番暑い時期」
"Time of arrival" 「(飛行機の)到着時刻」