Resolved: Compare DateTime against current system time?

In this post, we will see how to resolve Compare DateTime against current system time?

Question:

I’m trying to make a C# method to fulfill this user story.
These are the 2 acceptance criteria

Start time must be at least one hour later than the current system time.
End time must be at last one hour after start time.

Both of the start and end time must be DateTime values, so I can parse it with the TryParse method.
Here’s what I have in my code so far:
`

private DateTime datetime;
public DateTime datetimeStart { get; set; }
public DateTime datetimeEnd { get; set; }

while (true) {
    Util.GetInput("Delivery window start (dd/mm/yyyy hh:mm)");
    string userInput = ReadLine();
    
    if(DateTime.TryParse(userInput, out datetime))
    {
        if (datetime.TimeOfDay.Hours - DateTime.Now.TimeOfDay.Hours >= 1) {
            datetimeStart = datetime;
        }
        break;
    }
    else
    {
        WriteLine("\tDelivery window start must be at least one hour in the future.");
    }
}

while (true) {
    Util.GetInput("Delivery window end (dd/mm/yyyy hh:mm)");
    string userInput = ReadLine();
    
    if(DateTime.TryParse(userInput, out datetime))
    {
        if (datetime.TimeOfDay.Hours - datetimeStart.TimeOfDay.Hours >= 1) {
            datetimeEnd = datetime;
        }
        break;
    }
    else
    {
        WriteLine("\tDelivery window end must be at least one hour later than the start.");
    }
}

`
I’m not fully sure how the DateTime type works yet, but later on, I’d need to get an output string with this format: “The pickup window for your order will be 04:00 on 30/10/2022 and 20:00 on 30/10/2022”, and just replace the data in the string with values from datetimeStart and datetimeEnd

Best Answer:

DateTime provides all the tools to write your conditions in straightforward code:

one hour later than / after checkTime

is just

checkTime.AddHours(1)

and

someTime must be at least one hour later than / after checkTime

becomes

someTime >= checkTime.AddHours(1)

So your code may look something like this:

...........................
    if (datetime >= DateTime.Now.AddHours(1)) {
        datetimeStart = datetime;
    }
...........................
    if (datetime >= datetimeStart.AddHours(1)) {
        datetimeEnd = datetime;
    }
...........................

If you have better answer, please add a comment about this, thank you!

Source: Stackoverflow.com

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