iOS Swift - Calculate the difference between two times

Question

I would like to know how to calculate the difference between the login time and log out time, for Example: Login time: 8:00 AM and Logout time: 5:00 PM, and I should get 9 hours as total hours rendered.

This is the format of the time that is saved to Firebase

     // Set the time
    let timeFormatter = DateFormatter()
    timeFormatter.dateStyle = .none
    timeFormatter.timeStyle = .short
    timeFormatter.amSymbol = "AM"
    timeFormatter.pmSymbol = "PM"

    let timeString = timeFormatter.string(from: date)

Possible duplicate of [Difference between 2 dates in weeks and days using swift 3 and xcode 8](https://stackoverflow.com/questions/42294864/difference-between-2-dates-in-weeks-and-days-using-swift-3-and-xcode-8) — aksh1t, Sep 27 '17 at 01:55
@LeoDabus, sorry for that. Thanks for the reminders. Have a great day! — TSM, Sep 27 '17 at 01:58
@LeoDabus, I tried the solution you posted on that post and it is what I needed. I should have looked further and could have found your post before asking this question. Thank you so much! Again, I apologize for asking this question. — TSM, Sep 27 '17 at 03:16
Possible duplicate of [Find difference in seconds between NSDates as integer using Swift](https://stackoverflow.com/questions/26599172/find-difference-in-seconds-between-nsdates-as-integer-using-swift) — Jaydeep Vora, Sep 27 '17 at 05:17

aksh1t · Answer 1 · 2017-09-27T01:53:03.613

6

Edit: Found duplicate question

Create Date objects (link to question) from the login (loginTime) and logout (logoutTime) times, and then use them like so:

let components = Calendar.current.dateComponents([.hour, .minute], from: loginTime, to: logoutTime)

// To get the hours
print(components.hour)
// To get the minutes
print(components.minute)

edited Sep 27 '17 at 01:53

answered Sep 27 '17 at 01:49

aksh1t

5,410
1
37
55

@aksh1t I am using this but [.hour, .minute] getting error "Type of expression is ambiguous without more context" How can I resolve it. – veerendra pratap singh Jan 31 '19 at 10:02
@ekscrypto can you please tell me . why I am getting this error. – veerendra pratap singh Jan 31 '19 at 10:12
@veerendrapratapsingh this isn't my code or answer. Check my answer for proper syntax/usage – ekscrypto Feb 01 '19 at 15:55

score 3 · Accepted Answer · edited Aug 08 '18 at 12:44

At login...

    let loginTime = Date()
    UserDefaults.standard.set(loginTime, forKey: "loginTime")

Then at logout...

    let loginTime = UserDefaults.standard.object(forKey: "loginTime") as? Date ?? Date()
    let loginInterval = -loginTime.timeIntervalSinceNow

    let formatter = DateComponentsFormatter()
    formatter.unitsStyle = .full
    formatter.includesApproximationPhrase = false
    formatter.includesTimeRemainingPhrase = false
    formatter.allowedUnits = [.hour, .minute]

    // Use the configured formatter to generate the string.
    let userLoginTimeString = formatter.string(from: loginInterval) ?? ""
    print("user was logged in for \(userLoginTimeString)")

Thanks for your reply @ekscrypto. I will try this out too. Have a nice day! — TSM, Sep 27 '17 at 02:12

iOS Swift - Calculate the difference between two times

2 Answers2