How to add hours to an NSDate?

Question

I have a date converted to double value and saved in database. Now, I want to compare if currentDate > myDataBaseDate + 8 hours i.e., I want to get 8 hours added to myDataBaseDate. I'm converting date into double values. So how do I get 8 hours later time from my database saved date. How do I compare

if (currentDateTime > DateFromdatabaseValue + DateByAdding8HoursInDataBase)

score 149 · Accepted Answer · edited Oct 23 '11 at 18:22

149

I'm not entirely sure what you are trying to do, but you can create an NSDate object by adding time in seconds on to another NSDate using:

- (id)dateByAddingTimeInterval:(NSTimeInterval)seconds

// eg. to add 8 hours to current time:

NSDate *mydate = [NSDate date];
NSTimeInterval secondsInEightHours = 8 * 60 * 60;
NSDate *dateEightHoursAhead = [mydate dateByAddingTimeInterval:secondsInEightHours];

edited Oct 23 '11 at 18:22

Rui Lopes

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answered Oct 31 '09 at 13:51

Tom Jefferys

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Avoid using this kind of date math if precision is important to you. You can't assume 60 seconds in a minute, nor 60 minutes in an hour. NSCalendar exists to abstract away all those corner cases (leap seconds, for example). – Ben Packard Jun 28 '15 at 20:15
tnks buddy...best answer i found – Mehul Aug 11 '15 at 05:36
@BenPackard what's your solution in that case? – circuitry Sep 05 '16 at 21:55
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@circuitry It's posted below - http://stackoverflow.com/a/30152081/225253 – Ben Packard Sep 06 '16 at 00:30

score 19 · Answer 2 · answered May 10 '15 at 13:38

19

Since iOS 8 there is the more convenient dateByAddingUnit:

//add 8 hours
let calendar = NSCalendar.autoupdatingCurrentCalendar()
newDate = calendar.dateByAddingUnit(.CalendarUnitHour, value: 8, toDate: originalDate, options: nil)

answered May 10 '15 at 13:38

Ben Packard

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This should be the accepted answer, thanks for answering and commenting above. – woody121 Feb 03 '17 at 04:32

score 2 · Answer 3 · answered Jan 15 '15 at 17:04

2

You can simply use:

NSDate *incrementedDate = [NSDate dateWithTimeInterval:numberOfSeconds sinceDate:[NSDate date]];

answered Jan 15 '15 at 17:04

TechSeeko

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score 0 · Answer 4 · answered Oct 31 '09 at 13:48

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You can simply add 8 * 3600 to your database value (assuming that your converted double value represents seconds).

answered Oct 31 '09 at 13:48

Pascal

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score 0 · Answer 5 · answered Oct 17 '14 at 15:52

NSDate *startdate = datePicker.date;

    NSTimeInterval secondsInOneHours = 1 * 60 * 60;

    NSDate *dateOneHoursAhead = [startdate dateByAddingTimeInterval:secondsInOneHours];

    [dateformate setDateFormat:@"d-MMM-yy HH:mm:ss"];

    strDate = [dateformate stringFromDate:dateOneHoursAhead];

score 0 · Answer 6 · answered Feb 28 '17 at 12:43

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Swift 3.X Simple usage

let calendar = NSCalendar.autoupdatingCurrent
let newDate = calendar.date(byAdding: .hour, value: 8, to: Date())

answered Feb 28 '17 at 12:43

SwiftDeveloper

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How to add hours to an NSDate?

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