iOS: How to calculate milliseconds between two dates

Question

I am working in networking swizzling of URLSession and getting every request details. However when I am trying to calculate value of request date in milliseconds, sometimes calculation is showing much higher value. In swizzling of startLoading we are taking current date and inside stopLoading we are calculating milliseconds. Below is my logic

let startDate: Date?
override public func startLoading() {
    startDate = Date()
}

override public func stopLoading() {
   print(fabs(startDate.timeIntervalSinceNow) * 1000)


 }

`Double(endDate.timeIntervalSince(startDate)) * 1000` seems to be correct, what's the issue though? — Tj3n, Sep 18 '19 at 10:57
https://stackoverflow.com/questions/26599172/find-difference-in-seconds-between-nsdates-as-integer-using-swift — Onur Tuna, Sep 18 '19 at 10:57
Off-topic but don't do `fabs` on the result, you will hide "incorrect" measurements. At least return 0.0 if negative — Joakim Danielson, Sep 18 '19 at 11:14

score 12 · Accepted Answer · answered Sep 18 '19 at 11:14

12

In your stopLoading function you should call:

print(Date().timeIntervalSince(startDate) * 1000)

This way you will see how much time (in ms) has passed since startDate.

answered Sep 18 '19 at 11:14

Razvan S.

753
7
21

Abhi Yaduwanshi · Answer 2 · 2019-09-18T11:24:32.897

2

Another way to find difference between two dates using Calender

let diff = Calendar.current.dateComponents([.second], from: Date1, to: Date2).second
let millisecond = diff * 1000
print(millisecond)

edited Sep 18 '19 at 11:24

answered Sep 18 '19 at 11:01

Abhi Yaduwanshi

380
3
12

score 0 · Answer 3 · answered Sep 18 '19 at 12:49

0

Date() function as it says in the Documentation is returning UTC time. Have you checked if the startDate variable is also UTC time? You should probably calculate also the difference bettween the users time zone and the UTC time.

answered Sep 18 '19 at 12:49

Vasilis D.

1,416
13
21

iOS: How to calculate milliseconds between two dates

3 Answers3