Comparing Time Without Date Swift3

comparing time without date swift3

Suggestion using DateComponents

• Assuming this given array

  let times = ["4:30 AM","1:00 PM","3:20 PM","6:40 PM","9:10 PM"]
  

• Create a date formatter matching the format

  let formatter = DateFormatter()
  formatter.dateFormat = "h:mm a"
  

• Map the time strings to Date and immediately to DateComponents considering only hour and minute

  let dateArray = times.map { Calendar.current.dateComponents([.hour, .minute], from:formatter.date(from:$0)!) }
  

• Map this array to the next date from now matching the components respectively

  let upcomingDates = dateArray.map { Calendar.current.nextDate(after: Date(), matching: $0, matchingPolicy: .nextTime)!  }
  

• Sort the array ascending, the first item is the date you are looking for

  let nextDate = upcomingDates.sorted().first!
  

• Use the formatter to convert the date back to a time string

  print(formatter.string(from:nextDate))
  

Swift 3 - Comparing Date objects

I have tried this snippet (in Xcode 8 Beta 6), and it is working fine.

let date1 = Date()
let date2 = Date().addingTimeInterval(100)

if date1 == date2 { ... }
else if date1 > date2 { ... }
else if date1 < date2 { ... }

Compare only time difference in Date objects

You can use Calendar to extract the DateComponents and then combine the day, month, and year from one with the hour, minute, and second of the other into another Date object. Then you can compare the two Date objects that share the same date using the well documented methods.

For example, given date1 and date2, we can calculate date3 with date of date1, but time of date2. We can then compare date1 to this new date3:

let calendar = Calendar.current
let components2 = calendar.dateComponents([.hour, .minute, .second], from: date2)
let date3 = calendar.date(bySettingHour: components2.hour!, minute: components2.minute!, second: components2.second!, of: date1)!

Then, to get the number of minutes between date1 and date3:

let minutes = calendar.dateComponents([.minute], from: date1, to: date3).minute!

Or hours and minutes:

let difference = calendar.dateComponents([.hour, .minute], from: date1, to: date3)
let hours = difference.hour!
let minutes = difference.minute!

Or, if you want to show this to the user, you'd often use DateComponentsFormatter to get a nice, localized string representation:

let formatter = DateComponentsFormatter()
formatter.unitsStyle = .full
formatter.allowedUnits = [.hour, .minute]  // or [.minute]
let string = formatter.string(from: date1, to: date3)!

Comparing NSDates without time component

Use this Calendar function to compare dates in iOS 8.0+

func compare(_ date1: Date, to date2: Date, toGranularity component: Calendar.Component) -> ComparisonResult

passing .day as the unit

Use this function as follows:

let now = Date()
// "Sep 23, 2015, 10:26 AM"
let olderDate = Date(timeIntervalSinceNow: -10000)
// "Sep 23, 2015, 7:40 AM"

var order = Calendar.current.compare(now, to: olderDate, toGranularity: .hour)

switch order {
case .orderedDescending:
    print("DESCENDING")
case .orderedAscending:
    print("ASCENDING")
case .orderedSame:
    print("SAME")
}

// Compare to hour: DESCENDING

var order = Calendar.current.compare(now, to: olderDate, toGranularity: .day)

switch order {
case .orderedDescending:
    print("DESCENDING")
case .orderedAscending:
    print("ASCENDING")
case .orderedSame:
    print("SAME")
}

// Compare to day: SAME

How can i compare two dates (NSDate) in Swift 3 and get the days between them?

Simply make extension of Date like this and get difference in days.

extension Date {
    func daysBetweenDate(toDate: Date) -> Int {
        let components = Calendar.current.dateComponents([.day], from: self, to: toDate)
        return components.day ?? 0
    }
}

Now use this extension like this

let numOfDays = fromDate.daysBetweenDate(toDate: toDate)

You can use DateFormatter to convert String to Date like this.

let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy"
dateFormatter.timeZone = TimeZone(abbreviation: "GMT")
let date = dateFormatter.date(from: "18-11-2016")

Get time difference between two times in swift 3

The recommended way to do any date math is Calendar and DateComponents

let difference = Calendar.current.dateComponents([.hour, .minute], from: time1, to: time2)
let formattedString = String(format: "%02ld%02ld", difference.hour!, difference.minute!)
print(formattedString)

The format %02ld adds the padding zero.

If you need a standard format with a colon between hours and minutes DateComponentsFormatter() could be a more convenient way

let formatter = DateComponentsFormatter()
formatter.allowedUnits = [.hour, .minute]
print(formatter.string(from: time1, to: time2)!)

Need simple way to compare a time string ONLY to the current dates time value

the approach would be lets date the Date() object from your current time object so you will get

default date + your time = 2000-01-01 00:00:00 +your time (7.00 AM or 9.00 PM)

now we will get the current time from today only, in same format. (Only time)

it will be something like 3.56 PM

now again we will convert this 3.56 PM to Date() with default date as prev. so now we will have two date time object with same Date(2000-01-01) and respective times.

• 2000-01-01 7:00:00 => this will your 7.00 AM with default date
• 2000-01-01 15:56:00 => this will be current time with default date

now we will compare two date object.

Check the fiddle Fiddle

func CompareMyTimeInString(myTime:String)->Bool
{
    // create the formatter - we are expecting only "hh:mm a" format
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "hh:mm a"
    dateFormatter.locale = Locale.init(identifier: "en_GB")

    // default date with my time
    var dt_MyTime = dateFormatter.date(from: yourTime)!

    // current time in same format as string "hh:mm a"
    var currentTimString = dateFormatter.string(from: Date());
    print("Current Time is - "+currentTimString);

    // current time with default date.
    var dt_CurrentTime = dateFormatter.date(from: currentTimString)!

    // now just compare two date objects :)
    return dt_MyTime > dt_CurrentTime;
}

// then call it like 
var yourTime = "7.00 AM"
var isDue = CompareMyTimeInString(myTime:yourTime);
print(isDue);

How to convert string to date without time in Swift 3?

let dateWithTime = Date()

let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .short

let date = dateFormatter.string(from: dateWithTime) // 2/10/17

This will format it correctly, but this will be for display purposes only. All Dates have time.

Comparing Time in ios Swift

Compare the time by ignoring the date component -

func checkTime() -> Bool {

let dateFormatter: DateFormatter = DateFormatter()
dateFormatter.timeZone = TimeZone(abbreviation: "PKT")
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"

let startingSlot = "2000-01-01 08:00:00" //UTC
let endingSlot = "2000-01-01 23:00:00" //UTC

let date = Date()

let date1: Date = dateFormatter.date(from: startingSlot)!
let date2: Date = dateFormatter.date(from: endingSlot)!

let currentTime = 60*Calendar.current.component(.hour, from: date) + Calendar.current.component(.minute, from: date) + (Calendar.current.component(.second, from: date)/60) // in minutes
let time1 = 60*Calendar.current.component(.hour, from: date1) + Calendar.current.component(.minute, from: date1) + (Calendar.current.component(.second, from: date1)/60) // in minutes
let time2 =  60*Calendar.current.component(.hour, from: date2) + Calendar.current.component(.minute, from: date2) + (Calendar.current.component(.second, from: date1)/60) // in minutes

print(currentTime)
print(time1)
print(time2)

if(currentTime >= time1 && currentTime <= time2) {
    return true
} else {
    return false
}

}

Output-

1121

510

1410

true

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