NSDate with date component from one and time component from another NSDate - ios

Question

I have two UIDatePicker controls in my app, one configured with UIDatePickerModeDate and one with UIDatePickerModeTime.
I want to configure a NSDate object with the date from UIDatePicker one and the time from the second one ... how?
Thanks,
Mark

Answer 1

Assume date1 and date2 are your two NSDate values. date1 contains your date components and date2 contains your time components. Here's how you would combine them together:
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
// Extract date components into components1
NSDateComponents *components1 = [gregorianCalendar components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit
fromDate:date1];
// Extract time components into components2
NSDateComponents *components2 = [gregorianCalendar components:NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit
fromDate:date2];
// Combine date and time into components3
NSDateComponents *components3 = [[NSDateComponents alloc] init];
[components3 setYear:components1.year];
[components3 setMonth:components1.month];
[components3 setDay:components1.day];
[components3 setHour:components2.hour];
[components3 setMinute:components2.minute];
[components3 setSecond:components2.second];
// Generate a new NSDate from components3.
NSDate *combinedDate = [gregorianCalendar dateFromComponents:components3];
// combinedDate contains both your date and time!
For iOS 8.0 +
NSCalendar *gregorianCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
// Extract date components into components1
NSDateComponents *components1 = [gregorianCalendar components:(NSCalendarUnit)(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay)
fromDate:date1];
// Extract time components into components2
NSDateComponents *components2 = [gregorianCalendar components:(NSCalendarUnit)(NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond)
fromDate:date2];
// Combine date and time into components3
NSDateComponents *components3 = [[NSDateComponents alloc] init];
[components3 setYear:components1.year];
[components3 setMonth:components1.month];
[components3 setDay:components1.day];
[components3 setHour:components2.hour];
[components3 setMinute:components2.minute];
[components3 setSecond:components2.second];
// Generate a new NSDate from components3.
NSDate * combinedDate = [gregorianCalendar dateFromComponents:components3];
// combinedDate contains both your date and time!

Answer 2

In Swift:
let calendar = NSCalendar.currentCalendar()
let date1 = NSDate() // PickerDateMode
let date2 = NSDate() // PickerHourMode
let componentsOne = calendar.components([.Year, .Month, .Day], fromDate: date1)
let componentsTwo = calendar.components([.Hour, .Minute], fromDate: date2)
let totalComponents = NSDateComponents()
totalComponents.year = componentsOne.year
totalComponents.month = componentsOne.month
totalComponents.day = componentsOne.day
totalComponents.hour = componentsTwo.hour
totalComponents.minute = componentsTwo.minute
let finalDate = calendar.dateFromComponents(totalComponents)

Answer 3

NSCalendar *calendar= [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSCalendarUnit unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDate *date = [NSDate date];//datapicker date
NSDateComponents *dateComponents = [calendar components:unitFlags fromDate:date];
NSInteger year = [dateComponents year];
NSInteger month = [dateComponents month];
NSInteger day = [dateComponents day];
NSInteger hour = [dateComponents hour];
NSInteger minute = [dateComponents minute];
NSInteger second = [dateComponents second];

Answer 4

Update to Swift 4 and 4.1
func combineDateAndTimeToOneDate() {
let datefrmter = DateFormatter()
datefrmter.dateFormat = "dd/MM/yyyy"
let dateFromString = datefrmter.date(from: lblDate.text!)
datefrmter.dateFormat = "h:mm a"
let timeFromString = datefrmter.date(from: lblTime.text!)
let calendar = NSCalendar.current
let componentsOne = calendar.dateComponents([.year,.month,.day], from: dateFromString!)
let componentsTwo = calendar.dateComponents([.hour,.minute,.second,.nanosecond], from: timeFromString!)
let totalComponents = NSDateComponents()
totalComponents.year = componentsOne.year!
totalComponents.month = componentsOne.month!
totalComponents.day = componentsOne.day!
totalComponents.hour = componentsTwo.hour!
totalComponents.minute = componentsTwo.minute!
totalComponents.second = componentsTwo.second!
totalComponents.nanosecond = componentsTwo.nanosecond!
let finalDate = calendar.date(from: totalComponents as DateComponents)
print(finalDate)
}
Hope it helps!