我使用 Go 構(gòu)建我的游戲服務(wù)器。我將比較來(lái)自 Firestore 字段的時(shí)間time.Now()和來(lái)自 Firestore 字段的時(shí)間。我怎樣才能在 Go 中做到這一點(diǎn)？        playerDataSnap, err := Instace.FireStoreClient.Collection("PlayerData").Doc(playerUID).Get(Instace.Context)    if err != nil {        log.Printf("EventModeFee Get PlayerData Fail: %v", err)        return    }    playerData := playerDataSnap.Data()    if value, exist := playerData["EventPlayTimes"]; exist {        eventPlayTimes = value.(int64)    }    if discount_Subscribe > 0 {        if value, exist := playerData["SubscriptionExpiredDate"]; exist { //Get Subscribe expired time            var expireTimeStamp = value //<-------------timestamp from firestore field            if time.Now().Before(expireTimeStamp) {//<---------------expireTimeStamp is not a valid type, but How can I convert it to a valid type                isSubscribed = true            }        }    }expireTimeStamp不是有效類(lèi)型，但如何將其轉(zhuǎn)換為有效類(lèi)型？