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[已解决]swift中格式化NSDate得到毫秒数

iOS crifan 1484浏览 0评论

之前通过:

    //get date formatted string

    //2015/11/28 10:48:12

    func toString(dateFormat:String) -> String {

        let dateFormatter:NSDateFormatter = NSDateFormatter()

        dateFormatter.dateFormat = dateFormat

        let formattedDatetimeStr:String = dateFormatter.stringFromDate(self)

        return formattedDatetimeStr

    }

                let curTime = NSDate()

                let curTimeStr = curTime.toString("yyyyMMdd_HHmmss")

可以得到时分秒:

现在想要得到毫秒

swift nsdate milliseconds

Objective-C – 获取毫秒时间戳: – ifziv – 博客频道 – CSDN.NET

好像是:

SSS

即可。

请问怎么样把1308847489毫秒时间转换成2011-07-19这样的时间格式? | iOS开发 – CocoaChina CocoaChina_让移动开发更简单

time – iPhone: How to get current milliseconds? – Stack Overflow

Convert NSDate time in milliseconds as Int32 and Int64 in Swift – Stack Overflow

nsdate – Swift ios date as milliseconds Double or UInt64? – Stack Overflow

               let curTime = NSDate()

//                let curTimeStr = curTime.toString("yyyyMMdd_HHmmss")

                let curTimeStr = curTime.toString("yyyyMMdd_HHmmss.SSS")

可以得到我要的毫秒:

(lldb) po curTime

2016-04-27 03:34:58 +0000

(lldb) po curTimeStr

"20160427_113458.831"

[后记]

后来为了得到毫秒的timestamp,用:

let timestampInt:Int = Int(updateTime.timeIntervalSince1970)

// timestampInt=1461989598

但是只得到了秒的时间戳:1461989598

参考:

time – iPhone: How to get current milliseconds? – Stack Overflow

去试试:

                let updateTime:NSDate = eachConversationItem.updateTime

//                let timestampInt:Int = Int(updateTime.timeIntervalSince1970)

                let timeIntervalInSecFloat:Float = Float(updateTime.timeIntervalSince1970)

                let timeIntervalInMsFloat:Float = timeIntervalInSecFloat * 1000

                let timestampMsInt:Int = Int(timeIntervalInMsFloat)

                gLog.verbose("updateTime=\(updateTime), timeIntervalInSecFloat=\(timeIntervalInSecFloat), timeIntervalInMsFloat=\(timeIntervalInMsFloat), timestampMsInt=\(timestampMsInt)")

                //updateTime=2016-04-30 04:13:18 +0000, timeIntervalInSecFloat=1.46199e+09, timeIntervalInMsFloat=1.46199e+12, timestampMsInt=1461989670912

即可。

不过后来遇到:

fatal error: floating point value cannot be converted to Int because it is greater than Int.max

然后去调试发现:

(lldb) po Int.max

2147483647

果然是,毫秒的timestamp,比如:

1461989670912

是比Int.max大多了。。。

所以要去改为int64:

直接改为Int64,会导致字典型变量无法正常的当作AnyObject被传入其他参数,

最后改为:

                let timestampMsInt:NSNumber = NSNumber(longLong: Int64(timeIntervalInMsFloat))

转载请注明:在路上 » [已解决]swift中格式化NSDate得到毫秒数

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