Find if current time falls in a time range

Question

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    lt   currentTime TimeOfDay       amp  amp  Convert ToDateTime  13 01    gt   currentTime TimeOfDay         match found     UPDATE1  Thanks everyone for your suggestions   I wasn t familiar with the TimeSpan function

User · Answer

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.

User · Answer

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

User · Answer

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 gt  end  amp  amp   t lt end   t gt  start     start lt end  amp  amp   t gt  start  amp  amp  t lt end                         Console WriteLine  Mached                      else                       Console WriteLine  Not Mached

User · Answer

if  new TimeSpan 11 59 0   lt   currentTime TimeOfDay  amp  amp  new TimeSpan 13 01 0   gt    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

User · Answer

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  gt  start   amp  amp   now  lt  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  gt  start   amp  amp   now  lt  end          match found

User · Answer

Using Linq we can simplify this by this   Enumerable Range 0   int  to - from  TotalHours   1               Select i   gt  from AddHours i   Where date   gt  date TimeOfDay  gt   new TimeSpan 8  0  0   amp  amp  date TimeOfDay  lt   new TimeSpan 18  0  0

User · Answer

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  gt   start TimeOfDay  amp  amp                  now TimeOfDay  lt  end TimeOfDay     Handle the boundary case of switching the day across mid-night if  end  lt  start      bMatched    bMatched   if bMatched           match found  current time is between start and end   else          otherwise

User · Answer

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

User · Answer

A simple little extension function for this  public static bool IsBetween this DateTime now  TimeSpan start  TimeSpan end        var time   now TimeOfDay         Scenario 1  If the start time and the end time are in the same day      if  start  lt   end          return time  gt   start  amp  amp  time  lt   end         Scenario 2  The start time and end time is on different days      return time  gt   start    time  lt   end

User · Answer

The TimeOfDay property returns a TimeSpan value   Try the following code   TimeSpan time   DateTime Now TimeOfDay   if  time  gt  new TimeSpan 11  59  00           Hours  Minutes  Seconds   amp  amp  time  lt  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

[c#] Find if current time falls in a time range

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