I am getting a string from API containing date and time as:
createdAt = "2019-08-12T10:34:05.000Z"
I need to extract date from this string and time also.
And how can I get difference as time between two given date strings?
e.g. If I have two strings as:
StartedOn = "2019-08-12T10:32:18.000Z"
StopedOn = "2019-08-12T10:34:05.000Z".
How to get time from start to stop.
swift 4, Xcode 10
Use DateFormatter to get the Date instance from the String, i.e.
let str = "2019-08-12T10:34:05.000Z"
let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
let date = formatter.date(from: str)
Now, to get the time difference use timeIntervalSince(_:) with the 2 Date objects, i.e.
let startedOn = "2019-08-12T10:32:18.000Z"
let stoppedOn = "2019-08-12T10:34:05.000Z"
if let startedOnDate = formatter.date(from: startedOn), let stoppedOnDate = formatter.date(from: stoppedOn) {
let timeInterval = stoppedOnDate.timeIntervalSince(startedOnDate)
print(timeInterval)
}
In case you need more detailed components between 2 Date objects, use Calendar object like so,
if let startedOnDate = formatter.date(from: startedOn), let stoppedOnDate = formatter.date(from: stoppedOn) {
let calendar = Calendar(identifier: .gregorian)
let components = calendar.dateComponents([.hour, .minute, .second], from: startedOnDate, to: stoppedOnDate)
print(components) //hour: 0 minute: 1 second: 47
}
Edit:
To get the date and time separately from Date object,
let str = "2019-08-12T10:34:05.000Z"
let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
if let date = formatter.date(from: str) {
formatter.dateFormat = "hh:mm:ss a"
let timeStr = formatter.string(from: date)
print(timeStr) //add timeStr to your timeLabel here...
formatter.dateFormat = "yyyy-MM-dd"
let dateStr = formatter.string(from: date)
print(dateStr) //add dateStr to your dateLabel here...
}
Try with this :D
import datetime
StartedOn = "2019-08-12T10:32:18.000Z"
StopedOn = "2019-08-12T10:34:05.000Z"
StartedOn = datetime.datetime.fromisoformat(StartedOn[:-1])
StoppedOn = datetime.datetime.fromisoformat(StopedOn[:-1])
print(StoppedOn - StartedOn)
There are two dedicated date formatters for that purpose, ISO8601DateFormatter to convert the ISO8601 string to Date
let isoFormatter = ISO8601DateFormatter()
isoFormatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
let createdAtDate = isoFormatter.date(from: "2019-08-12T10:34:05.000Z")
let startedOn = "2019-08-12T10:32:18.000Z"
let stopedOn = "2019-08-12T10:34:05.000Z"
let startedOnDate = isoFormatter.date(from: startedOn)!
let stopedOnDate = isoFormatter.date(from: stopedOn)!
and DateComponentsFormatter to get a m:ss string from the difference between start and end date
let componentsFormatter = DateComponentsFormatter()
componentsFormatter.allowedUnits = [.minute, .second]
let duration = componentsFormatter.string(from: startedOnDate, to: stopedOnDate)
Related
I'm trying to get the current date. Current Date and time is 2019-12-16 05:12:59 but I get 2019-12-16 10:12:59.
let dateAdded = itemDict["time"] as! String
let df = DateFormatter()
df.dateFormat = "yyyy-MM-dd hh:mm:ss"
let currentTime = df.date(from: dateAdded)
let dateTime = currentTime!.addingTimeInterval(60.0 * 60.0)
let currentDate = Date()
Try this:
Date().toCurrentTimezone()
extension Date {
func toCurrentTimezone() -> Date {
let timeZoneDifference =
TimeInterval(TimeZone.current.secondsFromGMT())
return self.addingTimeInterval(timeZoneDifference)
}
}
To get the current time without a format you can simply just add this:
let currentDateTime = Date()
print(currentDateTime)
But if you would like to retrieve a "string" and convert it into a date you can do:
let dateAdded = itemDict["time"] as! String
//Convert string to date
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm"
let date = dateFormatter.date(from: dateAdded!)
If you're still getting wrong time, you should add timezone. In that case the code will be something like this:
let dateAdded = itemDict["time"] as! String
//Convert string to date
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm"
dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
let date = dateFormatter.date(from: dateAdded!)
If you're using uppercase "HH" that means you're using the 24h clock. Otherwise use small case "hh".
You need to set your local time zone in date formator.
//Get local time Zone
var localTimeZoneIdentifier: String { return TimeZone.current.identifier }
print("local Time zone: " + localTimeZoneIdentifier)
let inputdateString: String = "2019-12-16 05:12:59"
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: localTimeZoneIdentifier)
dateFormatter.dateFormat = "yyyy-MM-dd hh:mm:ss"
let inputDate = dateFormatter.date(from: inputdateString )!
print("Output date: \(String(describing: inputDate))")
out put:-
local Time zone:-Asia/Kolkata
Output date: 2019-12-15 23:42:59 +0000
I'm trying to set a label to a formatted date string on Sign Out press.
let dateFormatterUK = DateFormatter()
let dateString : String = String(describing: Date())
dateFormatterUK.dateFormat = "dd-MM-yyyy"
let currentDateTime = dateFormatterUK.date(from: dateString)
Above is my code formatting the Date. When I set my label to the currentDateTime variable however, it is set as Nil.
Try this one:
let dateFormatterUK = DateFormatter()
dateFormatterUK.dateFormat = "dd-MM-yyyy"
let currentDateTime = dateFormatterUK.string(from: Date())
And If your date is in String and want to change format:
let dateFormatterUK = DateFormatter()
dateFormatterUK.dateFormat = "dd-MM-yyyy"
let stringDate = "11-03-2018"
let date = dateFormatterUK.date(from: stringDate)!
// set new format
dateFormatterUK.dateFormat = "yyyy-MM-dd"
let currentDateTime = dateFormatterUK.string(from: date)
I have a date "2017-12-31" as a String.
What I want to get finally is only the month: "12" as a String.
So I thought that I can change it to Date using a date formatter
let formatter = DateFormatter()
formatter.dateFormat = "MM"
What do I do next?
let dateString = "2017-12-31"
let formatter = DateFormatter()
formatter.calendar = Calendar(identifier: Calendar.Identifier.iso8601) formatter.timeZone = TimeZone(identifier: TimeZone.autoupdatingCurrent.identifier)
formatter.dateFormat = "yyyy-MM-dd"
let localDate = formatter.date(from: dateString)
formatter.dateFormat = "MM"
let strMonth = formatter.string(from: localDate!)
print("Month is:",strMonth)
Another way
let dateString = "2017-12-31"
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
let localDate = formatter.date(from: dateString)
let month = String(NSCalendar.current.component(.month, from: localDate!))
print(month)
First you have to use the DateFormatter to create a temporary Date object from your source String object. Then you have to use it to create your final String from the temporary Date object.
let dateString = "2017-12-31"
let dateFormatter = DateFormatter()
// set the dateFormatter's dateFormat to the dateString's format
dateFormatter.dateFormat = "yyyy-MM-dd"
// create date object
guard let tempDate = dateFormatter.date(from: dateString) else {
fatalError("wrong dateFormat")
}
// set the dateFormatter's dateFormat to the output format you wish to receive
dateFormatter.dateFormat = "LL" // LL is the stand-alone month
let month = dateFormatter.string(from: tempDate)
Use below function for getting month from string file of date
func getMonthFromDateString(strDate: String) -> String {
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
let date = formatter.date(from: strDate) // Convert String File To Date
formatter.dateFormat = "MM"
let strMM = formatter.string(from: date!) // Convert date to string
return strMM
}
I'm looking to call a function that checks time elapsed since date. This will determine how the timeLable displays in my messages view controller, similar to IMessage.
The code I'm using below only shows HH:MM
let date = dateFormatter().dateFromString((recent["date"] as? String)!)
timeLabel.text = NSDateFormatter.localizedStringFromDate(date!, dateStyle: NSDateFormatterStyle.NoStyle, timeStyle: NSDateFormatterStyle.NoStyle)
I'm looking to change it to something along the lines of:
If date is today, date = "HH:MM"
If date is Yesterday, date = "Yesterday"
If date is the day before yesterday and so on, date = "Monday, Tuesday, Wednesday..."
If date is over 1 week, date = MM/DD/YY
Or try this. Note that we have to use components:fromDate: and then use components:fromDateComponents:toDateComponents:options: because if we don't 23:59 last night returns 23:59 instead of Yesterday.
extension NSDateFormatter {
static func friendlyStringForDate(date:NSDate) -> String {
// Fetch the default calendar
let calendar = NSCalendar.currentCalendar()
// Compute components from target date
let from = calendar.components([.Day, .Month, .Year], fromDate: date)
// Compute components from current date
let to = calendar.components([.Day, .Month, .Year], fromDate: NSDate())
// Compute days difference between the two
let delta = calendar.components(.Day, fromDateComponents: from, toDateComponents: to, options: [])
switch delta.day {
case 0:
let formatter = NSDateFormatter()
formatter.timeZone = NSTimeZone.defaultTimeZone()
formatter.dateFormat = "HH:mm"
return formatter.stringFromDate(date)
case 1:
return "Yesterday"
case 2..<7:
let formatter = NSDateFormatter()
formatter.timeStyle = .NoStyle
formatter.dateFormat = "EEEE"
return formatter.stringFromDate(date)
default:
let formatter = NSDateFormatter()
formatter.timeStyle = .NoStyle
formatter.dateFormat = "MM/dd/YY"
return formatter.stringFromDate(date)
}
}
}
Now then, to use it just:
timeLabel.text = NSDateFormatter.friendlyStringForDate(date!)
SWIFT 3:
extension DateFormatter {
static func friendlyStringForDate(date: Date) -> String {
// Fetch the default calendar
let calendar = Calendar.current
let unitFlags: NSCalendar.Unit = [.day]
// Compute days difference between the two
let delta = (calendar as NSCalendar).components(unitFlags, from: date, to: Date(), options: [])
if let day = delta.day {
switch day {
case 0:
let formatter = DateFormatter()
formatter.timeZone = NSTimeZone.default
formatter.dateFormat = "hh:mm a"
return formatter.string(from: date)
case 1:
return "Yesterday"
case 2..<7:
let formatter = DateFormatter()
formatter.timeStyle = .none
formatter.dateFormat = "EEEE"
return formatter.string(from: date)
default:
let formatter = DateFormatter()
formatter.timeStyle = .none
formatter.dateFormat = "MM/dd/YY"
return formatter.string(from: date)
}
}
return ""
}
}
I understand how to use an NSDateFormatter to convert a month component into a long name string, but how does one convert a month name to an int?
I've been using a switch statement to convert, but I'm thinking there must be a simpler way.
For example, I'd like to convert "May" to 5.
You can use DateFormatter custom format "LLLL" to parse your date string (Month). If you are only parsing dates in english you should set the date formatter locale to "en_US_POSIX":
let df = DateFormatter()
df.locale = Locale(identifier: "en_US_POSIX")
df.dateFormat = "LLLL" // if you need 3 letter month just use "LLL"
if let date = df.date(from: "May") {
let month = Calendar.current.component(.month, from: date)
print(month) // 5
}
Thanks Josh. I've converted the Obj-C code and posted it below for future reference:
let calendar = NSCalendar(identifier: NSCalendarIdentifierGregorian)
let components = NSDateComponents()
let formatter = NSDateFormatter()
formatter.dateFormat = "MMMM"
let aDate = formatter.dateFromString("May")
let components1 = calendar!.components(.CalendarUnitMonth , fromDate: aDate!)
let monthInt = components.month
Use MM for the month format. Use stringFromDate to convert your NSDate to a String. Then convert your string to an Int with .toInt()
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "MM"
let monthString = dateFormatter.stringFromDate(NSDate()) // "05"
let monthInt = monthString.toInt() // 5
NSDateFormatter has monthSymbols property. Try:
let formatter = NSDateFormatter()
formatter.calendar = NSCalendar(identifier: NSCalendarIdentifierGregorian)
let monthString = "September"
let month = find(formatter.monthSymbols as! [String], monthString).map { $0 + 1 }
// -> Optional(9)
let monthString2 = "Foobar"
let month2 = find(formatter.monthSymbols as! [String], monthString2).map { $0 + 1 }
// -> nil