Btukfyl

As per UTC to IST conversion tool if UTC 12Hr date string is = "2018-12-31 07:35 PM" then it needs to be converted as "2019-01-01 01:05" (24Hr format in IST) [note : here 12Hr IST converted date is "2019-01-01 01:05 AM"]

So how do to convert this 12Hr UTC date into 24Hr IST dateFormat?

current code is :

static func convertUTCdateToLocalTimezoneDate(dateString: String, fromDateFormat: String, toDateFormat: String) -> String {

        if dateString.count > 0 {

            let dateFormatter = DateFormatter()

            let is24Hr: Bool = AppUtility.isSystemTimeFormatIs24Hr(dateString: AppUtility.getIphoneCurrnetTime())

            let fromDateFormatLocal = is24Hr == true ? kDateIn24Format : kDateIn12Format

            dateFormatter.dateFormat = fromDateFormatLocal

            dateFormatter.timeZone = TimeZone(abbreviation: "UTC")

            let date = dateFormatter.date(from: dateString)

            var timeStamp = ""

            dateFormatter.dateFormat = toDateFormat

            dateFormatter.timeZone = NSTimeZone.local

            timeStamp = dateFormatter.string(from: date!)

            return timeStamp

        }

        return ""

    }



static func isSystemTimeFormatIs24Hr(dateString: String) -> Bool {

    let formatter = DateFormatter()

    formatter.locale = NSLocale.current

    formatter.dateStyle = .none

    formatter.timeStyle = .short

    let amRange: NSRange? = (dateString as NSString).range(of: formatter.amSymbol)

    let pmRange: NSRange? = (dateString as NSString).range(of: formatter.pmSymbol)

    let is24h: Bool = amRange?.location == NSNotFound && pmRange?.location == NSNotFound

    return is24h

}

// let string12H = "2018-11-30 07:35 PM"

// let string24H = "2018-11-30 17:35:22"



// let date12H = getDateFrom(string12H, withFormat: "yyyy-MM-dd hh:mm a", timeZone: "IST")

// let date24H = getDateFrom(string24H, withFormat: "yyyy-MM-dd HH:mm:ss", timeZone: "IST")





func getDateFrom(_ dateString: String, withFormat formatString: String, timeZone: String = "UTC") -> Date? {

    var dateToReturn: Date?

    let formatter = DateFormatter()

    formatter.timeZone = NSTimeZone(abbreviation: timeZone) as TimeZone?

    formatter.locale = Locale(identifier: "en_US_POSIX")

    formatter.dateFormat = formatString

    dateToReturn = formatter.date(from: dateString)

    return dateToReturn

}



func getStringFrom(_ date: Date, withFormat formatString: String) -> String? {

    var stringToReturn: String?

    let formatter = DateFormatter()

    formatter.dateFormat = formatString

    formatter.locale = Locale(identifier: "en_US_POSIX")

    stringToReturn = formatter.string(from: date)



    return stringToReturn

}