[date相关]

date.swift

//这个以 utc +0000

服务器是 utc 0 的时间

config的配置信息里也是 utc 0 时间（关键这里是计算出来的，当前时间零点+start）

所以此刻，所有人的倒计时都应该是一样的


    func calculateDownCount(start: Int, end: Int) {
        let serverNowStamp = (TimeAtomicClock.shared.now / 1000)
        let date = Date(timeIntervalSince1970: serverNowStamp)
        var components = NSCalendar.current.dateComponents([.year, .month, .day], from: Date())
        components.timeZone = TimeZone(secondsFromGMT: 0)
        let todayStart = NSCalendar.current.date(from: components)!
        
        let partyStartDate = NSCalendar.current.date(byAdding: .hour, value: start, to: todayStart)!
        let partyStartStamp = partyStartDate.timeIntervalSince1970
        let partyEndDate = NSCalendar.current.date(byAdding: .hour, value: end, to: todayStart)!
        let partyEndStamp = partyEndDate.timeIntervalSince1970
        
        print("message: 现在时间:\(TimeAtomicClock.shared.now / 1000)...\(date)\n\(todayStart)...\n\(partyStartDate)...\(partyStartStamp)\n\(partyEndDate)...\(partyEndStamp)")
        var count = 0
        if serverNowStamp > partyEndStamp {
            count = Int((partyStartStamp + 86400) - serverNowStamp)
        } else {
            if serverNowStamp < partyStartStamp {
                count = Int(partyStartStamp - serverNowStamp)
            } else {
                count = 0
            }
        }
    }