Swift compare between time - swift

Question

I have the current time, I need to check if the current time is between two times.
But I'm having trouble, as you can see startDate and endDate print past dates.
Can you give me a hand?
func getDate() -> Bool {
let start = "07:00"
let end = "19:00"
let dateFormat = "HH:mm"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = dateFormat
let startDate = dateFormatter.date(from: start)
let endDate = dateFormatter.date(from: end)
let currentDate = Date()
guard let startDate = startDate, let endDate = endDate else {
fatalError("Date Format does not match ⚠️")
}
print(startDate < currentDate && currentDate < endDate)
print(startDate) //2000-01-01 06:00:00 +0000
print(endDate) //2000-01-01 22:59:00 +0000
print(currentDate) //2021-07-13 22:11:05 +0000
return startDate < currentDate && currentDate < endDate
}

Answer 1

You just need to set your DateFormatter defaultDate to the start of the current date. If you would like to allow it to work with midnight (24:00) time as well you just need to set the date formatter isLenient to true. Note that if you create your date formatter inside your method it will create a new date formatter every time you call this method:
extension Formatter {
static let time: DateFormatter = {
let formatter = DateFormatter()
formatter.locale = .init(identifier: "en_US_POSIX")
formatter.dateFormat = "HH:mm"
formatter.defaultDate = Calendar.current.startOfDay(for: Date())
formatter.isLenient = true
return formatter
}()
}
func isTimeBetween(start: String, end: String) -> Bool {
Formatter.time.defaultDate = Calendar.current.startOfDay(for: Date())
guard
let start = Formatter.time.date(from: start),
let end = Formatter.time.date(from: end) else {
print("invalid time input")
return false
}
print(start.description(with: .current)) // Tuesday, July 13, 2021 at 11:00:00 PM
print(end.description(with: .current)) // Wednesday, July 14, 2021 at 12:00:00 AM
print(Date().description(with: .current)) // Tuesday, July 13, 2021 at 11:42:02 PM
return start...end ~= Date()
}
isTimeBetween(start: "23:00", end: "24:00") // true
This will print:
Tuesday, July 13, 2021 at 11:00:00 PM Brasilia Standard Time
Wednesday, July 14, 2021 at 12:00:00 AM Brasilia Standard Time
Tuesday, July 13, 2021 at 11:42:02 PM Brasilia Standard Time

Answer 2

You can use Calendar.current.date(bySetting...) to set the hour/second/minute of an existing date. Then, compare those results.
func getDate() -> Bool {
let currentDate = Date()
let startDate = Calendar.current.date(bySettingHour: 7, minute: 0, second: 0, of: currentDate)
let endDate = Calendar.current.date(bySettingHour: 19, minute: 0, second: 0, of: currentDate)
guard let startDate = startDate, let endDate = endDate else {
fatalError("Date creation failed ⚠️")
}
print(startDate < currentDate && currentDate < endDate)
print(startDate)
print(endDate)
print(currentDate)
return startDate < currentDate && currentDate < endDate
}