Get First Date And Last Date Of User Passed Date

Question

Hello

In asp.net C# code behind

If i enter for example like this in textbox1 15-May-2022 then In textbox2 it should show month first date 01-May-2022 and In textbox3
last date of that month 15-May-2022

If i enter for example like this in textbox1 04-JUN-2022 then In textbox2 it should show month first date 01-Jun-2022 and In textbox3
last date of that month 04-Jun-2022

If i enter for example like this in textbox1 07-JUL-2022 then In textbox2 it should show month first date 01-JUL-2022 and In textbox3
last date of that month 07-JUL-2022

Answer 1

what part do you need help with? as using C# would require a form post or Ajax, I'd just do it in javascript:

 date:<input id="text1" onchange="calcDates()"><br>   
  first:<input id="text2"><br>   
  last:<input id="text3"><br>   
     
<script>   
function formatDate(d) {   
  return (d.getMonth() + 1) + "/" + d.getDate() + "/" + d.getFullYear();   
}     
function calcDates(){   
    var d = new Date(document.getElementById('text1').value);   
    if (!isNaN(d)) {   
      var firstDay = new Date(d.getFullYear(), d.getMonth(), 1);   
      var lastDay = new Date(d.getFullYear(), d.getMonth() + 1, 0);   
   
      document.getElementById('text2').value = formatDate(firstDay);   
      document.getElementById('text3').value = formatDate(lastDay);   
    }   
}   
</script>   
   

Answer 2

Hi @RAVI ,
I think you could use datetime.Just like this:

DateTime v1 = Convert.ToDateTime(TextBox1.Text);  
DateTime s1 = new DateTime(v1.Year, v1.Month, 1);  
TextBox2.Text = s1.ToString();  
TextBox3.Text = TextBox1.Text;  

Best regards,
Yijing Sun

---

If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Answer 3

I did not notice the date format. here is a simple one for the desired format:

function formatDate(d) {   
   var months = "Jan,Feb,Mar,Apr,May,Jun,Jul,Aug,Sep,Oct,Nov,Dec".split(",");  
   return ("0"+ d.getDate()).substring(-2) + "-" + months[d.getMonth()] + "-" + d.getFullYear();   
 }    

Answer 4

I think you could use below two simple functions.

static string getMonthStartDate(string strDate)
{
DateTime dtresult = Convert.ToDateTime(strDate);
return "01"+ strDate.Substring(2);
}
static string getMonthEndDate(string strDate)
{
DateTime dtresult = Convert.ToDateTime(strDate);
return Convert.ToString(DateTime.DaysInMonth(dtresult.Year,dtresult.Month)) + strDate.Substring(2);
}