How to get the today's and tomorrow's date in swift 4

Question

How to get the current date in unix-epoch? timeIntervalSince1970 prints the current time. Is there any way to get today's time at 12 AM?

For example, The current time is : Jan 7, 2018 5:30 PM. timeIntervalSince1970 will print the current time i.e. 1546903800000. Current date in epoch system will be Jan 7, 2018 00:00 AM. i.e 1546848000000

Solution 1

I would do this with components.

Assuming you need time in seconds as defined by time(2). If you need in milliseconds as defined by time(3), then you can multiply it out by 1000.

// Get right now as it's `DateComponents`.
let now = Calendar.current.dateComponents(in: .current, from: Date())

// Create the start of the day in `DateComponents` by leaving off the time.
let today = DateComponents(year: now.year, month: now.month, day: now.day)
let dateToday = Calendar.current.date(from: today)!
print(dateToday.timeIntervalSince1970)

// Add 1 to the day to get tomorrow.
// Don't worry about month and year wraps, the API handles that.
let tomorrow = DateComponents(year: now.year, month: now.month, day: now.day! + 1)
let dateTomorrow = Calendar.current.date(from: tomorrow)!
print(dateTomorrow.timeIntervalSince1970)

You can get yesterday by subtracting 1.

---

If you need this in the universal time (UTC, GMT, Z… whatever name you give universal time), then use the following.

let utc = TimeZone(abbreviation: "UTC")!
let now = Calendar.current.dateComponents(in: utc, from: Date())

Solution 2

This can be done very simply using the following code. No need for date components or other complications.

var calendar = Calendar.current
// Use the following line if you want midnight UTC instead of local time
//calendar.timeZone = TimeZone(secondsFromGMT: 0)
let today = Date()
let midnight = calendar.startOfDay(for: today)
let tomorrow = calendar.date(byAdding: .day, value: 1, to: midnight)!

let midnightEpoch = midnight.timeIntervalSince1970
let tomorrowEpoch = tomorrow.timeIntervalSince1970

Solution 3

Use this extension to get today's and tomorrow's date

extension Date {
   static var tomorrow:  Date { return Date().dayAfter }
   static var today: Date {return Date()}
   var dayAfter: Date {
      return Calendar.current.date(byAdding: .day, value: 1, to: Date())!
   }
}

Solution 4

Also try adding following code in date extension:

extension Date
{
    var startOfDay: Date 
    {
        return Calendar.current.startOfDay(for: self)
    }

    func getDate(dayDifference: Int) -> Date {
        var components = DateComponents()
        components.day = dayDifference
        return Calendar.current.date(byAdding: components, to:startOfDay)!
    }
}

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Comments

[Amit Pal]

Thanks for the answer. Could you please multiply timeIntervalSince1970 with 1000 for the full fledge solution

[Jeffery Thomas]

It's all in what you want I suppose. time(2) is in seconds, but time(3) is in milliseconds. I'm old, so I assumed time(2).