How to Add Minutes to Current Time in Swift

How to add minutes to current time in swift

Two approaches:

1. Use Calendar and date(byAdding:to:wrappingComponents:). E.g., in Swift 3 and later:

   let calendar = Calendar.current
   let date = calendar.date(byAdding: .minute, value: 5, to: startDate)
   

2. Just use + operator (see +(_:_:)) to add a TimeInterval (i.e. a certain number of seconds). E.g. to add five minutes, you can:

   let date = startDate + 5 * 60
   

   (Note, the order is specific here: The date on the left side of the + and the seconds on the right side.)

   You can also use addingTimeInterval, if you’d prefer:

   let date = startDate.addingTimeInterval(5 * 60)
   

Bottom line, +/addingTimeInterval is easiest for simple scenarios, but if you ever want to add larger units (e.g., days, months, etc.), you would likely want to use the calendrical calculations because those adjust for daylight savings, whereas addingTimeInterval doesn’t.

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For Swift 2 renditions, see the previous revision of this answer.

How to add 5 minutes to my current time

Try this

let calendar = Calendar.current
let date = calendar.date(byAdding: .minute, value: 3, to: Date())
let dateFormatter = DateFormatter()
dateFormatter.timeStyle = .short
var selectedTime = dateFormatter.string(from: date!)

How to add minutes to custom time in swift2

You need to use dateByAddingUnit as @Rob doing instead of dateByAddingTimeInterval. The reason you are not getting correct time is may because of TimeZone so try to set timeZone with your NSDateFormatter instance.

endFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
endFormatter.timeZone = NSTimeZone(abbreviation: "UTC")
let endTimeString = "2017-01-16 12:58:56"
let endTime = endFormatter.dateFromString(endTimeString)

//Now add the 3 minute in endTime

let calendar = NSCalendar.currentCalendar()
let date = calendar.dateByAddingUnit(.Minute, value: 3, toDate: endTime, options: [])

How to get the current time as datetime

Update for Swift 3:

let date = Date()
let calendar = Calendar.current
let hour = calendar.component(.hour, from: date)
let minutes = calendar.component(.minute, from: date)

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I do this:

let date = NSDate()
let calendar = NSCalendar.currentCalendar()
let components = calendar.components(.CalendarUnitHour | .CalendarUnitMinute, fromDate: date)
let hour = components.hour
let minutes = components.minute

See the same question in objective-c How do I get hour and minutes from NSDate?

Compared to Nate’s answer, you’ll get numbers with this one, not strings… pick your choice!

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

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.

Adding Time Interval. e.g hours, minutes and seconds

I’m going to assume that “01:32:34” represents an elapsed time of 5,554 seconds, not 1:32am. So, I’d convert it to a TimeInterval, not a Date:

func timeInterval(from string: String) -> TimeInterval? {
    let components = string.components(separatedBy: ":").map { Double($0) }
    guard 
        components.count == 3,
        let hours = components[0],
        let minutes = components[1],
        let seconds = components[2]
    else { return nil }

    return ((hours * 60) + minutes) * 60 + seconds
}

You can chose to store either the original “01:32:34” string or this value, 5,554.0.

Anyway, then adding these numeric time intervals is trivial addition. And to display a resulting TimeInterval, you’d use a DateComponentsFormatter, e.g.

let timeIntervalFormatter: DateComponentsFormatter = {
    let formatter = DateComponentsFormatter()
    formatter.unitsStyle = .positional
    formatter.allowedUnits = [.hour, .minute, .second]
    return formatter
}()

func totalElapsed(_ strings: [String]) -> String? {
    let total = strings.reduce(TimeInterval.zero) { sum, string in
        sum + (timeInterval(from: string) ?? 0)
    }
    return timeIntervalFormatter.string(from: total)
}

let strings = ["1:15:16", "00:15:02", "00:45:27"]

let result = totalElapsed(strings)

02:15:45

Or if you want more of a (localized) natural language representation, use unitsStyle of .full:

2 hours, 15 minutes, 45 seconds

This approach (using TimeInterval, not Date) has the virtue that it also can represent intervals that exceed 24 hours.

SWIFT: How do I add hours to NSDate object

You're asking the wrong question. This is what's known as an "XY Problem".
You should be asking "How do I display a date string I get from a web server in the user's local time zone."

NSDate represents a date/time in an abstract form that does not contain a time zone. You convert it to a specific time zone for display. Do not try to add/subtract hours to an NSDate to offset for time zones. That is the wrong approach.

The correct answer is simple. Create a second date formatter and don't set it's timezone to GMT. It defaults to the user's local time zone.

let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
dateFormatter.timeZone = NSTimeZone(abbreviation: "GMT")
let date = dateFormatter.dateFromString(dateFromService) 

let outputDatedateFormatter = NSDateFormatter()
outputDatedateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
//leave the time zone at the default (user's time zone)
let displayString = outputDateFormatter.stringFromDate(date)
println("Date in local time zone = \(displayString)")

How to get hours and minutes from UIDatePicker

UIDatePicker just give you the selected Date, if you need the date component based on current calendar, check out the Calendar and DateComponent documendation for details.

let now = Date() // your date
let dateComponents = Calendar.current.dateComponents([.hour, .minute], from: now)

dateComponents.hour
dateComponents.minute

If you need hours and minutes for time distance, you need the calculate it manually with your prefer base date.

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