Take a certain amount of days off the current date and print with certain date format - swift

Question

How would I take a certain amount of days (take away one day) off the current date and print with certain date format to the console.
I'm currently using:
print((Calendar.current as NSCalendar).date(byAdding: .day, value: -1, to: Date(), options: [])!)
Which prints the date and time as:
yyyy-MM-dd HH:MM:SS +0000
But I want it to print like:
dd-MM-yyyy
Is this at all possible?

Answer 1

It's best to break that into a few more easily readable/maintainable lines. First, calculate the date you want, then apply a date formatter.
let yesterday = Calendar.current.date(byAdding: .day, value: -1, to: Date())
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy"
print(dateFormatter.stringFromDate(yesterday))

Answer 2

swift 3.0 version
let yesterday = Calendar.current.date(byAdding: .day, value: -1, to: Date())
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd-MM-yyyy"
if let yesterday = yesterday {
print(dateFormatter.string(from: yesterday))
}else{
print("Date incorrectly manipulated")
}

Answer 3

You shouldn't use fixed format for Date format strings. Because you might have users from around the world and they don't see dates in the same way.
Rather you should use template format. You just specify which components you want to show and their order like:
let dateFormatter = DateFormatter()
// dateFormatter.locale = Locale(identifier: "bn-BD") // Enable this line only at the time of your debugging/testing
dateFormatter.dateFormat = DateFormatter.dateFormat(fromTemplate: "ddMMyyyy",
options: 0,
locale: dateFormatter.locale)
let date = Calendar.current.date(byAdding: .day, value: -1, to: Date())
if let date = date {
let dateString = dateFormatter.string(from: date)
print(dateString)
}
You shouldn't set your locale by yourself. It's done by the
framework. You should only set your locale manually only at the time
of testing your app.
In the above example I'm using Locale as "bn-BD" which means Bangla in Bangladesh. You can find your a list of locales here