It is the time that 后面用過(guò)去式,虛擬語(yǔ)氣.
It was the time that,少見(jiàn).
the first time 用法相當(dāng)于連詞用法,用來(lái)引導(dǎo)從句
鏈接：It’s the first time that 現(xiàn)在完成時(shí)
It was the first time that 過(guò)去完成時(shí)