Convert time string to Unix time date of the same day - swift

Question

how to convert a string hour to millisecond of the day?
for exemple:
let strDate = "06:00 PM"
Or:
let strDate = "09:00 AM"
my code:
let dateString = "06:00 PM"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "HH:mm"
guard let date = dateFormatter.date(from: dateString)
else { fatalError() }
print(date)
for example my string is: 06:00 PM, so I want to have the date in millisecond of today Thursday 20 September 2018 at 06:00 PM

Answer 1

You can set your DateFormatter default date to startOfDay for today, set the formatter locale locale to "en_US_POSIX" when parsing your time then you can simply get your resulting date timeIntervalSince1970 and multiply by 1000:
let strTime = "06:00 PM"
let formatter = DateFormatter()
formatter.defaultDate = Calendar.current.startOfDay(for: Date())
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "hh:mm a"
if let date = formatter.date(from: strTime) {
let milliseconds = date.timeIntervalSince1970 * 1000
print(milliseconds) // 1537477200000
let date2 = Date(timeIntervalSince1970: milliseconds/1000)
print(date2.description(with: .current)) // Thursday, September 20, 2018 at 6:00:00 PM Brasilia Standard Time
}

Answer 2

First, you need to parse the date string:
let dateString = "06:00 PM"
let formatter = DateFormatter()
formatter.defaultDate = Date()
formatter.dateFormat = "hh:mm a"
formatter.locale = Locale(identifier: "en_US_POSIX")
let date = formatter.date(from: dateString)
Then, you need to get the start of day:
let calendar = Calendar.current
let start = calendar.startOfDay(for: date)
After that, get the time interval between date and start:
let timeInterval = date.timeIntervalSince(start)
let milliseconds = timeInterval * 1000.0