Joining separated Date and Hour to create a single Date() Object - swift

Question

I have this app written in swift where I get a future date and a future hour (As Unix Timestamp) separately and I want to turned them into one Date() Object so I can converted to Unix Timestamp.
If you now another way to converted directly to Unix Timestamp feel free to post.

Answer 1

This may give you some ideas on how to accomplish what you want:
let calendar = Calendar.current
let currentDate = Date()
// Random future date, 1 month from now
let futureDate = calendar.date(byAdding: .month, value: 1, to: currentDate)!
let futureDateComponents = calendar.dateComponents([.year, .month, .day], from: futureDate)
// Random hour
let futureHour = 2
// Use your future date and your future hour to set the components for the new date to be created
var newDateComponents = calendar.dateComponents([.year, .month, .day, .hour, .minute, .second], from: currentDate)
newDateComponents.year = futureDateComponents.year
newDateComponents.month = futureDateComponents.month
newDateComponents.day = futureDateComponents.day
newDateComponents.hour = futureHour
newDateComponents.minute = 0
newDateComponents.second = 0
// Create a new date from components
let newDate = calendar.date(from: newDateComponents)!
// Convert new date to unix time format
let unixTime = newDate.timeIntervalSince1970
print(newDate) // 2018-03-06 02:00:00 +0000
print(unixTime) // 1520301600.0
Note that in a real project you should avoid force unwrapping (i.e. using '!').

Answer 2

If you have a date string in the form of dd-MM-yyyy, you can convert that to a Date object like so:
let string = "02-06-2018"
let formatter = DateFormatter()
formatter.dateFormat = "dd-MM-yyyy"
formatter.locale = Locale(identifier: "en_US_POSIX") // this is only needed if string is always gregorian but you don't know what locale the device is using
guard let date = formatter.date(from: string) else {
// handle error however you'd like
return
}
Or, if you already have a Date object, then you don't need the above. But regardless, once you have a Date, you can then get a Date by setting the hour, minute, and second as follows:
let hour = 14 // 2pm
guard let result = Calendar.current.date(bySettingHour: hour, minute: 0, second: 0, of: date) else {
// handle error however you'd like
return
}