如何将时间字符串转换为 NSDate? [英] How to convert time String into NSDate?

问题描述

如何将时间字符串(24 小时格式)转换为 NSDate 进行比较?

How can I convert time string (in 24h format) into NSDate for comparison?

我在这里得到零和错误的 NSDate:

I get nil and wrong NSDate here:

let a = "5:46"
let b = "24:30"

let dateFormatter = NSDateFormatter()
dateFormatter.timeStyle = .ShortStyle
dateFormatter.dateFormat = "k:mm" // k = Hour in 1~24, mm = Minute

let outputA = dateFormatter.dateFromString(a)
let outputB = dateFormatter.dateFromString(b)

println("A: \(outputA)  B: \(outputB)")

然后我得到

A: Optional(1999-12-31 20:46:00 +0000)  B: nil

当我想得到

A: 5:46 AM  B: 00:30 AM

或

A: 05:46  B: 24:30

只要我能比较这两个小时，哪种 NSDate 格式并不重要.

It doesn't really matter which NSDate format as long as I can compare those two hours.

推荐答案

在日期格式中添加NSTimeZone.

    let a = "5:46"
    let b = "24:30"

    let dateFormatter = NSDateFormatter()
    dateFormatter.timeStyle = .ShortStyle
    dateFormatter.dateFormat = "k:mm" // k = Hour in 1~24, mm = Minute
    let timeZone = NSTimeZone(name: "UTC")
    dateFormatter.timeZone=timeZone
    let outputA = dateFormatter.dateFromString(a)
    let outputB = dateFormatter.dateFromString(b)

    println("A: \(outputA)  B: \(outputB)")

输出是:

Printing description of outputA:
2000-01-01 05:46:00 +0000
Printing description of outputB:
2000-01-01 00:30:00 +0000

这篇关于如何将时间字符串转换为 NSDate?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！