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copied!<p>Created an asp.net custom validator to compare hours & minutes part of two datetime controls.<br> And called javascript function from <code>ClientValidationFunction</code> property of <strong>asp.net custom validator</strong>.<br> Function is here:</p> <pre><code> function ValidateHour&Minute(sender, args){ var startDateHour = document.getElementById("<%=DateTimeControlStartDate.Controls[1].ClientID %>").value;// gets value from hours dropdown list for 1st datetime control var startDateMinute = document.getElementById("<%=DateTimeControlStartDate.Controls[2].ClientID %>").value;// gets value from minutes dropdown list for 1st datetime control var timeStart = new Date(); var timeEnd = new Date(); var strStartHour; var hourType; hourType = startDateHour.split(' '); if (hourType[1] == "AM") { startDateHour=startDateHour.split(' '); strStartHour = startDateHour[0]; } else { startDateHour=startDateHour.split(' '); strStartHour = startDateHour[0]; strStartHour = parseInt(strStartHour) + 12; } timeStart.setHours(strStartHour, startDateMinute, 0, 0); var strEndHour; var endDateHour = document.getElementById("<%=DateTimeControlEndDate.Controls[1].ClientID %>").value;// gets value from hours dropdown list for 2nd datetime control var endDateMinute = document.getElementById("<%=DateTimeControlEndDate.Controls[2].ClientID %>").value;// gets value from minutes dropdown list for 2nd datetime control hourType = endDateHour.split(' '); if (hourType[1] == "AM") { endDateHour=endDateHour.split(' '); strEndHour = endDateHour[0]; } else { endDateHour= endDateHour.split(' '); strEndHour = endDateHour[0]; strEndHour = parseInt(strEndHour) + 12; } timeEnd.setHours(strEndHour, endDateMinute, 0, 0); if (timeStart < timeEnd) { args.IsValid = true; } else { args.IsValid = false; } } </code></pre>

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