Find if current time falls in a time range

问题

Using .NET 3.5

I want to determine if the current time falls in a time range.

So far I have the currentime:

DateTime currentTime = new DateTime();
currentTime.TimeOfDay;

I\'m blanking out on how to get the time range converted and compared. Would this work?

if (Convert.ToDateTime(\"11:59\") <= currentTime.TimeOfDay 
    && Convert.ToDateTime(\"13:01\") >= currentTime.TimeOfDay)
{
   //match found
}

UPDATE1: Thanks everyone for your suggestions. I wasn\'t familiar with the TimeSpan function.

回答1:

For checking for a time of day use:

TimeSpan start = new TimeSpan(10, 0, 0); //10 o'clock
TimeSpan end = new TimeSpan(12, 0, 0); //12 o'clock
TimeSpan now = DateTime.Now.TimeOfDay;

if ((now > start) && (now < end))
{
   //match found
}

For absolute times use:

DateTime start = new DateTime(2009, 12, 9, 10, 0, 0)); //10 o'clock
DateTime end = new DateTime(2009, 12, 10, 12, 0, 0)); //12 o'clock
DateTime now = DateTime.Now;

if ((now > start) && (now < end))
{
   //match found
}

回答2:

Some good answers here but none cover the case of your start time being in a different day than your end time. If you need to straddle the day boundary, then something like this may help:

TimeSpan start = TimeSpan.Parse("22:00"); // 10 PM
TimeSpan end = TimeSpan.Parse("02:00");   // 2 AM
TimeSpan now = DateTime.Now.TimeOfDay;

if (start <= end)
{
    // start and stop times are in the same day
    if (now >= start && now <= end)
    {
        // current time is between start and stop
    }
}
else
{
    // start and stop times are in different days
    if (now >= start || now <= end)
    {
       // current time is between start and stop
    }
}

Note that in this example the time boundaries are inclusive and that this still assumes less than a 24-hour difference between start and stop.

回答3:

if (new TimeSpan(11,59,0) <= currentTime.TimeOfDay && new TimeSpan(13,01,0) >=  currentTime.TimeOfDay)
{
   //match found
}

if you really want to parse a string into a TimeSpan, then you can use:

    TimeSpan start = TimeSpan.Parse("11:59");
    TimeSpan end = TimeSpan.Parse("13:01");

回答4:

A simple little extension function for this:

public static bool IsBetween(this DateTime now, TimeSpan start, TimeSpan end)
{
    var time = now.TimeOfDay;
    // If the start time and the end time is in the same day.
    if (start <= end)
        return time >= start && time <= end;
    // The start time and end time is on different days.
    return time >= start || time <= end;
}

回答5:

Try using the TimeRange object in C# to complete your goal.

TimeRange timeRange = new TimeRange();
timeRange = TimeRange.Parse("13:00-14:00");

bool IsNowInTheRange = timeRange.IsIn(DateTime.Now.TimeOfDay);
Console.Write(IsNowInTheRange);

Here is where I got that example of using TimeRange

回答6:

The TimeOfDay property returns a TimeSpan value.

Try the following code:

TimeSpan time = DateTime.Now.TimeOfDay;

if (time > new TimeSpan(11, 59, 00)        //Hours, Minutes, Seconds
 && time < new TimeSpan(13, 01, 00)) {
    //match found
}

Also, new DateTime() is the same as DateTime.MinValue and will always be equal to 1/1/0001 12:00:00 AM. (Value types cannot have non-empty default values) You want to use DateTime.Now.

回答7:

You're very close, the problem is you're comparing a DateTime to a TimeOfDay. What you need to do is add the .TimeOfDay property to the end of your Convert.ToDateTime() functions.

回答8:

Will this be simpler for handling the day boundary case? :)

TimeSpan start = TimeSpan.Parse("22:00");  // 10 PM
TimeSpan end = TimeSpan.Parse("02:00");    // 2 AM
TimeSpan now = DateTime.Now.TimeOfDay;

bool bMatched = now.TimeOfDay >= start.TimeOfDay &&
                now.TimeOfDay < end.TimeOfDay;
// Handle the boundary case of switching the day across mid-night
if (end < start)
    bMatched = !bMatched;

if(bMatched)
{
    // match found, current time is between start and end
}
else
{
    // otherwise ... 
}

回答9:

Using Linq we can simplify this by this

 Enumerable.Range(0, (int)(to - from).TotalHours + 1)
            .Select(i => from.AddHours(i)).Where(date => date.TimeOfDay >= new TimeSpan(8, 0, 0) && date.TimeOfDay <= new TimeSpan(18, 0, 0))

回答10:

 using System;

 public class Program
 {
    public static void Main()
    {
        TimeSpan t=new TimeSpan(20,00,00);//Time to check

        TimeSpan start = new TimeSpan(20, 0, 0); //8 o'clock evening

        TimeSpan end = new TimeSpan(08, 0, 0); //8 o'clock Morning

        if ((start>=end && (t<end ||t>=start))||(start<end && (t>=start && t<end)))
        {
           Console.WriteLine("Mached");
        }
        else
        {
            Console.WriteLine("Not Mached");
        }

    }
 }

来源：https://stackoverflow.com/questions/1504494/find-if-current-time-falls-in-a-time-range

标签

datetime

timespan