How to calculate time difference between current time and yesterday date with static time [duplicate]

问题

I have a current time and a static time (eg - yesterday 9.30 pm), I need to find the time difference between these two times in hh:mm:ss format.

This is the code I used to get the current time:

let date = Date()
let calendar = Calendar.current

let hour = calendar.component(.hour, from: date)
let minutes = calendar.component(.minute, from: date)
let seconds = calendar.component(.second, from: date)
print("hours = \(hour):\(minutes):\(seconds)")

回答1:

try this:-

    let dateFormatter = DateFormatter()
    var userCalendar = Calendar.current
    userCalendar.timeZone = TimeZone.current
    let requestedComponent: Set<Calendar.Component> = [.hour,.minute,.second]
    dateFormatter.dateFormat = "dd/MM/yy hh:mm:ss"
    let startTime = Date()
    let endTime = dateFormatter.date(from: "28/08/17 08:40:00")
    let timeDifference = userCalendar.dateComponents(requestedComponent, from: endTime!, to: startTime)
    print(timeDifference)
    let date = Calendar(identifier: .gregorian).date(from: timeDifference)
    dateFormatter.dateFormat = "HH:mm:ss"
    let dateString =  dateFormatter.string(from: date!)

    print(dateString)

you can change format according to your requirement.

回答2:

let date = Date()
let cal = Calendar.current
let formatter = DateFormatter()
formatter.dateFormat = "HH:mm:ss"
let staticTime = ...
let comps = cal.dateComponents([.hour, .minute, .second], from: date, to: staticTime)
let diff = cal.date(from: comps)!
let diffString = formatter.string(from: diff)

来源：https://stackoverflow.com/questions/45932215/how-to-calculate-time-difference-between-current-time-and-yesterday-date-with-st

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swift

swift3