How to compare two dates using asp.net, C#

Question

0.00/5 (No votes)

See more:

C#

string todaydate = DateTime.Now.ToString("dd/MM/yyyy");
if(txtDate.text<todaydate)>
{
    Response.Write("Supplied date is not Current Date");
}

Why it is not except operator < or >. I m not able to understand
Thanks

Posted 22-Mar-12 22:13pm

deepu kuamar

Updated 22-Mar-12 23:36pm

ProEnggSoft

v2

Add a Solution

Comments

ProEnggSoft 23-Mar-12 5:36am

Edit: pre tag for C# code added and question tagged sith ASP.NET and C# - PES

shek124 23-Mar-12 6:02am

you cannot compare the strings using comparison operators.
Please have to go through the basic things. Then you start to write the program/code.

8 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Answer 1 · 2012-03-22T22:27:00

Do not work with date strings, work with the instance of the structure System.DateTime. Those strings should appear only when you about to display data on screen (in HTML, for most typical case).

The instances of DataTime can be compared with operators '==', '!=', '<', '>', '<=' or '>='.
You can also subtract two points in time to get an instance of the structure System.TimeSpan representing the distance in time between them. The most readable way of doing such subtraction is, no surprise, the operator '-' (minus). If you subtract earlier time from later time the result is positive, negative in the opposite case.

Please see:
http://msdn.microsoft.com/en-us/library/system.datetime.aspx[^],
http://msdn.microsoft.com/en-us/library/system.timespan.aspx[^].

—SA

Praveen Kullu · Answer 2 · 2012-03-23T00:01:00

Solution 4

You could do it in this way:

C#

string todaydate = DateTime.Now.ToString("dd/MM/yyyy");
DateTime dtSuppliedDate = DateTime.Parse(txtDate.Text);

if(dtSuppliedDate.Subtract(DateTime.Today).Days!=0)
{
    Response.Write("Supplied date is not Current Date");
}

Posted 23-Mar-12 0:01am

Praveen Kullu

Comments

deepu kuamar 23-Mar-12 6:19am

DateTime dtSuppliedDate = DateTime.Parse(txtDate.Text);///It through error
String was not recognized as a valid DateTime.

Praveen Kullu 23-Mar-12 7:16am

Show the exact text you are entering in txtDate. If it is not in valid date format, it will show error.

Praveen Kullu 23-Mar-12 7:36am

Write the date you are entering in reply Commments. Probably the format of the date is wrong.

Peace ON · Answer 3 · 2012-03-22T23:42:00

Solution 3

Please try Google. There are many postings on many sites for comparing dates in C#, ASP.NET.

Hope this help.

Posted 22-Mar-12 23:42pm

Peace ON

pratikv20 · Answer 4 · 2012-03-22T22:36:00

Solution 2

Hi,

You can not compare the date in this way , in current code you have compared
strings,You should first convert the textbox input in DateTime type then you can compare the dates

Thanks

Posted 22-Mar-12 22:36pm

pratikv20

Vikas Nalawade · Answer 5 · 2014-06-08T19:21:00

DateTime systemDate = DateTime.Now;
DateTime compareDate = DateTime.Today.AddHours(11D);


// less than
if (compareDate < systemDate)
    Console.WriteLine("Less Than");


// equal to
if (compareDate == systemDate)
    Console.WriteLine("Equal To");


// greater than
if (compareDate > systemDate)
    Console.WriteLine("Greater Than");


// basically you can compare it in all the normal ways
// using !=, ==, <, >, <=, >=, etc


// or if you just want a straight number result inorder to sort
// you can use
int compareValue = compareDate.Compare(systemDate);
int compareValue2 = DateTime.Compare(systemDate, compareDate);

But remember it is always better to use a lighter weight process.  The Convert or Parse process is pretty heavy because it has to take the string break it apart compare it against a whole set of rules and then based on the rules it has to change them to the correct object.  Or with what I did above you are simply adding two decimal values together which is a much faster process.

Ajith The Great · Answer 6 · 2012-03-23T01:19:00

Solution 5

Hi,

Use This One

C#

int dtCmpr = Convert.ToInt32(DateTime.Compare(Convert.ToDateTime(DateTime.Now), Convert.ToDateTime(txtDate.text)));

if (dtCmpr <= -1)
{
    Response.Write("Supplied date is not Current Date");
}

Hope This May Help You...

Posted 23-Mar-12 1:19am

Ajith The Great

Comments

Member 9550455 1-Dec-12 4:12am

nice one. thanks

Khlaid · Answer 7 · 2013-04-28T21:45:00

----Using Java Script----
function CheckDate() {
var SDate = document.getElementById("txtStartFrom");
var EDate = document.getElementById("txtValidUpto");

var endDate = new Date(EDate.value);
var startDate = new Date(SDate.value);
if (SDate != '' && EDate != '' && startDate > endDate) {
alert("Please ensure that the End Date is greater than or equal to the Start Date.");
EDate.focus();
EDate.value = SDate.value;
return false;
}

Vikas Nalawade · Answer 8 · 2014-06-08T23:15:00

Solution 8

SQL

Maybe you can use ToString() method.  use this address to rearrange date values and

if (currentTime.ToString("yyyyMMdd")== endTime.ToString("yyyyMMdd")

pls check this link

http://www.geekzilla.co.uk/View00FF7904-B510-468C-A2C8-F859AA20581F.htm[^]

Posted 8-Jun-14 23:15pm

Vikas Nalawade

Updated 8-Jun-14 23:16pm

v2

How to compare two dates using asp.net, C#

8 solutions

Solution 1

Solution 4

Solution 3

Solution 2

Solution 7

Solution 5

Solution 6

Solution 8

Add your solution here

Preview 0