How to Compare Datetime in C#

How to compare DateTime in C#?

MSDN: DateTime.Compare

DateTime date1 = new DateTime(2009, 8, 1, 0, 0, 0);
DateTime date2 = new DateTime(2009, 8, 1, 12, 0, 0);
int result = DateTime.Compare(date1, date2);
string relationship;

if (result < 0)
   relationship = "is earlier than";
else if (result == 0)
   relationship = "is the same time as";         
else
   relationship = "is later than";

Console.WriteLine("{0} {1} {2}", date1, relationship, date2);
// The example displays the following output:
//    8/1/2009 12:00:00 AM is earlier than 8/1/2009 12:00:00 PM

C# correct method to compare 2 date time

Compare datetime as you would compare numbers such as

DateTime expiration_date = newVer.License.Status.Expiration_Date;
DateTime currentDateTime = DateTime.Now;
if( expiration_date < currentDateTime)
{
   // expired 
}

If you need only date and not time then use

  DateTime expiration_date = newVer.License.Status.Expiration_Date.Date;
  DateTime currentDateTime = DateTime.Now.Date;

You can also use day difference of two date.

int daydiff = (int)((currentDateTime - expiration_date).TotalDays)

C# compare two DateTimes

You can subtract two dates, and get a TimeSpan :

TimeSpan difference = _effective_date - date_of_submission;
if(difference.TotalDays > 90)
{
  // Bingo!
}

Best way to Compare DateTime to trigger code

To compare Dates, your method is efficient one because according to MSDN

The CompareTo method compares the Ticks property of the current instance and value but ignores their Kind property. Before comparing DateTime objects, make sure that the objects represent times in the same time zone.

So as it does compare Ticks of two instances of DateTime, so it is the efficient method for comparison.

As a side note, if you want to find interval between DateTime Instances then you can use DateTime.Subtraction it will give TimeSpan of both DateTime instances. So you can find total difference in their minutes, hours, days, seconds, milliseconds by using TimeSpan properties.

DateTime date1 = new DateTime(2010, 1, 1, 8, 0, 15);
DateTime dateNow = DateTime.Now;

TimeSpan interval = dateNow.Subtract(date1);

double totalHours= interval.TotalHours;
double totalMinutes = interval.TotalMinutes;
double totalSeconds= interval.TotalSeconds;
double totalMilliseconds= interval.TotalMilliseconds;

How to compare date time without time portion in C#

You just need to compare DateTime.Today and DateTime.Date:

if(_dateJoin.Date > DateTime.Today)
{
    // ...
}
else
{
    // ...
}

Update:

object value has date like Date = {03-16-2016 12:00:00 AM} when
execute this line

DateTime _dateJoin =   DateTime.ParseExact(value.ToString(), "MM/dd/yyyy", null);

then i'm getting error like String was not recognized as a valid DateTime. –

That's a different issue, you have to use the correct format provider:

DateTime _dateJoin = DateTime.Parse(value.ToString(), CultureInfo.InvariantCulture);

with ParseExact(not necessary in this case):

DateTime _dateJoin = DateTime.ParseExact(value.ToString(), "MM-dd-yyyy hh:mm:ss tt", CultureInfo.InvariantCulture);

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