ios - 将时间转换为 HH :mm:ss formate

Question

我正在将时间转换为这种格式(HH:mm:ss)，但我得到的响应为零。这里我附上了我的完整代码，请提出一些建议。

// This is my time
let setDate = "2000-01-01 12:04:00 UTC"

// Conversion in seconds
    let secondsConvert = manyServiceTime*60*60
    print(secondsConvert)

 // Time Interval
let datebbb = setDate!.addingTimeInterval(TimeInterval(secondsConvert))
    print(datebbb)

 //this is I am getting date with am/pm
let formatterEnd = DateFormatter()
    formatterEnd.dateFormat = "hh:mm a"
    formatterEnd.timeZone = TimeZone(abbreviation: "UTC")
    let settime1 = formatterEnd.string(from: datebbb)
    print(settime1)

//now here I am converting into hours minutes and seconds. 
let formatEnd = DateFormatter()
    formatEnd.dateFormat = "HH:mm:ss"
    let endTimeSet = formatEnd.string(from: datebbb)
    print(endTimeSet)

Answer 1

如果您只想要时间，请使用此代码我创建了一个以字符串形式返回时间的扩展

extension String {

  func formatDate() -> String {
    let formatter = DateFormatter()
    formatter.timeZone = TimeZone(abbreviation: "UTC")
    formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
    let dateFromStr = formatter.date(from: self)

    formatter.dateFormat = "HH:mm:ss"
    let endTimeSet = formatter.string(from: dateFromStr!)
    print(endTimeSet)
    return endTimeSet
    }
}

使用

let setDate = "2000-01-01 12:04:00"
let timeOnly = setDate.formatDate()