NSDateFormatter. Setting time elapsed since date in swift - swift

Question

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

Answer 1

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!)

Answer 2

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 ""
}
}