How to change the current day's hours and minutes in Swift?

If I create a Date() to get the current date and time, I want to create a new date from that but with different hour, minute, and zero seconds, what's the easiest way to do it using Swift? I've been finding so many examples with 'getting' but not 'setting'.

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最佳答案

Be aware that for locales that uses Daylight Saving Times, on clock change days, some hours may not exist or they may occur twice. Both solutions below return a Date? and use force-unwrapping. You should handle possible nil in your app.

Swift 3, 4, 5 and iOS 8 / OS X 10.9 or later

let date = Calendar.current.date(bySettingHour: 9, minute: 30, second: 0, of: Date())!

Swift 2

Use NSDateComponents / DateComponents:

let gregorian = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!
let now = NSDate()
let components = gregorian.components([.Year, .Month, .Day, .Hour, .Minute, .Second], fromDate: now)


// Change the time to 9:30:00 in your locale
components.hour = 9
components.minute = 30
components.second = 0


let date = gregorian.dateFromComponents(components)!

Note that if you call print(date), the printed time is in UTC. It's the same moment in time, just expressed in a different timezone from yours. Use a NSDateFormatter to convert it to your local time.

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swift 3 date extension with timezone

extension Date {
public func setTime(hour: Int, min: Int, sec: Int, timeZoneAbbrev: String = "UTC") -> Date? {
let x: Set<Calendar.Component> = [.year, .month, .day, .hour, .minute, .second]
let cal = Calendar.current
var components = cal.dateComponents(x, from: self)


components.timeZone = TimeZone(abbreviation: timeZoneAbbrev)
components.hour = hour
components.minute = min
components.second = sec


return cal.date(from: components)
}
}
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//Increase the day & hours in Swift


let dateformat = DateFormatter()
let timeformat = DateFormatter()
        

dateformat.dateStyle = .medium
timeformat.timeStyle = .medium


//Increase Day


let currentdate = Date()


let currentdateshow = dateformat.string(from: currentdate)
textfield2.text = currentdateshow


let myCurrentdate = dateformat.date(from: dateTimeString)!
let tomorrow = Calendar.current.date(byAdding: .day, value: 1, to: myCurrentdate) // Increase 1 Day


let tomorrowday = dateformat.string(from: tomorrow!)
text3.text = tomorrowday
text3.isEnabled = false
  

//increase Time
    

let time = Date()


let currenttime = timeformat.string(from: time)
text4.text = currenttime
        

let mycurrenttime = timeformat.date(from: currenttime)!
let increasetime = Calendar.current.date(byAdding: .hour, value: 2, to: mycurrenttime) //increase 2 hrs.


let increasemytime = timeformat.string(from: increasetime!)
text5.text = increasemytime

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