使用Swift将当前时间设置为yyyy-MM-dd 00:00:00 [英] Set current time to yyyy-MM-dd 00:00:00 using Swift

问题描述

我想问一下 NSDate ，如何设置/格式化当前时间，例如 2015-08-12 09:30:41 +0000到 2015-08 -12 00:00:00 +0000

I want to ask about NSDate, how to set/format current time like "2015-08-12 09:30:41 +0000" to "2015-08-12 00:00:00 +0000

我已经在使用：

var dateFormatter = NSDateFormatter()
dateFormatter.dateStyle = .MediumStyle
dateFormatter.timeStyle = .NoStyle
//result date will be : Aug 12, 2015

，但是起息日未完全存储在数据库中，如 2015-08-12 00:00:00 +0000但存储为 2015-08-11 17:00:00 +0000 UTC

but the value date is not stored in the Database exactly as "2015-08-12 00:00:00 +0000" but storing as "2015-08-11 17:00:00 +0000 UTC"

推荐答案

let dateString = "2015-08-12 09:30:41 +0000"
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
dateFormatter.calendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
dateFormatter.timeZone = NSTimeZone(forSecondsFromGMT: 0)
dateFormatter.locale = NSLocale(localeIdentifier: "en_US_POSIX")
if let dateFromString = dateFormatter.dateFromString(dateString.componentsSeparatedByString(" ").first ?? "") {
    println(dateFromString)  // "2015-08-12 00:00:00 +0000"
}

Swift 4

Swift 4

let dateString = "2019-05-04 09:30:41 +0000"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
dateFormatter.calendar = Calendar(identifier: .gregorian)
dateFormatter.timeZone = TimeZone(secondsFromGMT: 0)
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
if let dateFromString = dateFormatter.date(from: dateString.components(separatedBy: " ").first ?? "") {
    print(dateFromString)  // "2019-05-04 00:00:00 +0000"
}

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