How to convert dates range into string in swift 3? - ios

Question

How Can I convert dates into string format?
I am getting dates between two dates ( From to end date). and I was using this below method
class Dates {
static func printDatesBetweenInterval(_ startDate: Date, _ endDate: Date) {
var startDate = startDate
let calendar = Calendar.current
let fmt = DateFormatter()
fmt.dateFormat = "yyyy-MM-dd"
while startDate <= endDate {
print(fmt.string(from: startDate))
startDate = calendar.date(byAdding: .day, value: 1, to: startDate)!
}
}
static func dateFromString(_ dateString: String) -> Date {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
return dateFormatter.date(from: dateString)!
}}
and printing dates here
Dates.printDatesBetweenInterval(Dates.dateFromString("2017-10-02"), Dates.dateFromString("2017-10-9"))
result:
2017-10-02 2017-10-03 2017-10-04 2017-10-05 2017-10-06 2017-10-07 2017-10-08 2017-10-09
Now, I want pass this dates to String format to calendar (I am using FSCalendar lib into app). I want this format
example:
["2017-10-02", "2017-10-03", "2017-10-04", "2017-10-05", "2017-10-06", "2017-10-07", "2017-10-08", "2017-10-09"]
Can anyone guide me . Thanks

Answer 1

static func getDatesStringBetweenInterval(_ startDate: Date, _ endDate: Date)-> String {
var retval = "["
var startDate = startDate
let calendar = Calendar.current
let fmt = DateFormatter()
fmt.dateFormat = "yyyy-MM-dd"
while startDate <= endDate {
if startDate < endDate {
retval.append("\"\(fmt.string(from: startDate))\", ")
} else {
retval.append("\"\(fmt.string(from: startDate))\"")
}
startDate = calendar.date(byAdding: .day, value: 1, to: startDate)!
}
retval.append("]")
return retval
}
Usage:
let aDate = Dates.dateFromString("2017-01-01")
let bDate = Dates.dateFromString("2017-01-05")
let datesString = Dates.getDatesStringBetweenInterval(aDate, bDate)
print(datesString)

Answer 2

Return date string array from your function, like this:
class Dates {
static func printDatesBetweenInterval(_ startDate: Date, _ endDate: Date) -> [String] {
var startDate = startDate
let calendar = Calendar.current
let fmt = DateFormatter()
fmt.dateFormat = "yyyy-MM-dd"
var arrayDateString = [String]()
while startDate <= endDate {
let stringDate = fmt.string(from: startDate)
print("stringDate - \(stringDate)")
arrayDateString.append(stringDate)
startDate = calendar.date(byAdding: .day, value: 1, to: startDate)!
}
return arrayDateString
}
static func dateFromString(_ dateString: String) -> Date {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
return dateFormatter.date(from: dateString)!
}}
Now, print string array
let dateStringArray = Dates.printDatesBetweenInterval(Dates.dateFromString("2017-10-02"), Dates.dateFromString("2017-10-9"))
print("dateStringArray - \(dateStringArray)")
Edit:
Now, as you said, you've data in following format:
let dataArray = [
{ "hlddate": "07-Aug", "frmdt": "07-Aug-2017", "todt": "07-Aug-2017" },
{ "hlddate": "15-Aug", "frmdt": "15-Aug-2017", "todt": "15-Aug-2017" },
{ "hlddate": "10-Oct", "frmdt": "10-Oct-2017","todt": "31-Oct-2017" }
]
Try with following solution (Copy-paste, dataAray and class structure and see result):
class Dates {
static func dateFromString(dateString: String, webResponseDateFormat: String = "yyyy-MM-dd") -> Date? {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = webResponseDateFormat
return dateFormatter.date(from: dateString)
}}
static func printDatesBetweenInterval(startDate: Date, endDate: Date, requiredDateFormat: String = "yyyy-MM-dd") -> [String] {
var startDate = startDate
let calendar = Calendar.current
let fmt = DateFormatter()
fmt.dateFormat = requiredDateFormat
var arrayDateString = [String]()
while startDate <= endDate {
let stringDate = fmt.string(from: startDate)
print("stringDate - \(stringDate)")
arrayDateString.append(stringDate)
startDate = calendar.date(byAdding: .day, value: 1, to: startDate)!
}
return arrayDateString
}
if let stringDateArray = dataArray as? [[String : String]] {
for arrayElement in stringDateArray {
if let startDateString = arrayElement["frmdt"], let startDate = Dates.dateFromString(dateString: startDateString, webResponseDateFormat: "dd-MMM-yyyy"), let endDateString = arrayElement["todt"], let endDate = Dates.dateFromString(dateString: endDateString, webResponseDateFormat: "dd-MMM-yyyy") {
let dateStringArray = Dates.printDatesBetweenInterval(startDate: startDate, endDate: endDate, )
print("\n\n**\ndateStringArray - \(dateStringArray)")
}
}
}
Final Update
// Actual data structure
let dataArray = ["07-8-2017","08-08-2017","10-09-2017","20-10-2017",21-10-2017","23-10-2017", etc..]
Use above method and change data in server response section and getting result.
if let Streams = jsonDict["data"] as! [AnyObject]? {
for arrayElement in Streams {
if let startDateString = arrayElement["frmdt"] {
self.somedateFromString = self.convertStringToDate(string: startDateString as! String)
if let endDateString = arrayElement["todt"] {
self.somedateEndString = self.convertStringToDate(string: endDateString as! String)
}
self.presentdays = Dates.printDatesBetweenInterval(Dates.dateFromString(self.somedateFromString), Dates.dateFromString(self.somedateEndString))
self.totalHolidays.append(contentsOf: self.presentdays)
}
}
}