Convert long month name to int
I understand how to use NSDateFormatter
to convert month component to long name string, but how to convert month name to int
?
I am using a switch statement for the conversion, but I think there should be an easier way.
For example, I would like to convert "May" to 5.
Use MM
for month format. Use stringFromDate
to convert NSDate
to String
. Then convert the string to Int
with.toInt()
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "MM"
let monthString = dateFormatter.stringFromDate(NSDate()) // "05"
let monthInt = monthString.toInt() // 5
The custom DateFormatter "LLLL"
can be used to parse a date (month) string. If you are only looking for dates in English, you should set the date 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 to 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
NSDateFormatter
has a 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