如何比较两个时间字符串检查 string2 是否大于 swift 中的第一个字符串

Question

I am new in swift I search this questing and also got answer but not worked for me. Sorry for asking this again. My question is how to compare two time string. I am using this code.

let date = Date()
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        let result = formatter.string(from: date)
        print(result)
        
        var totalTimeLoggedIn = TimeInterval() // 1 hour
        
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        
        let loginTimeDate = dateFormatter.date(from: lblWorkStarted.text ?? "")!
        let logoutTimeDate = dateFormatter.date(from: result)!
        
        
        let timeLoggedIn = logoutTimeDate.timeIntervalSince(loginTimeDate)
        totalTimeLoggedIn += timeLoggedIn
        print("totalTimeLoggedIn: \(totalTimeLoggedIn.stringValue())")
        let TotalTimeLoginString = totalTimeLoggedIn.stringValue()
        let anotherdate = "02:00:00"
        
        if anotherdate < TotalTimeLoginString{
            print("True")
            
        }else{
            
        } 

lblWorkStarted.text is the current date and time. I am facing problem is that if TotalTimeLoginString is "10:15" some value like this then condition is not working properly and if TotalTimeLoginString is "03:12:11" some value like this then it is working properly. My problem is if I did not get hour then condition is not working. Thanks in Advance!

Answer 1

you have some mistakes here:

• You should create DateFormatter() again. It's heavy operation as https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/DataFormatting/Articles/dfDateFormatting10_4.html#//apple_ref/doc/uid/TP40002369-SW10

• You have to differentiate date and duration. Today is 8/4/2020, you can't compare it with duration as 1 hour, 2 hours.

• if your anotherdate is two hours, why you don't compare it as: 2 * 60 * 60 < totalTimeLoggedIn ?

   let date = Date() let dateFormatter = DateFormatter() dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss" let loginTimeDate = dateFormatter.date(from: lblWorkStarted.text?? ""). let timeLoggedIn = Date().timeIntervalSince(loginTimeDate) let anotherDate = 2 * 60 * 60 if anotherDate < timeLoggedIn { print("True") }else{ }