get minutes from selected hours
i have following code for users to select hours.
its only for 1 to 12 hours format
all fields are dropdown
startHour : startMinutes : finishHour : finishMinutes : AM/PM
i want to validate with javascript that user can only select correct time. And calculate the minutes of selected hours from dropdown menus.
example
2:00 To 6:00 PM
3:15 To 4:45 PM
11:00(AM) To 2:00 PM
here is the code for my html
Code:
<table border="1" cellpadding="5" cellspacing="0" align="center">
<tr>
<td>Start Time</td>
<td>Finish Time</td>
<td>AM/PM</td>
<td> </td>
</tr>
<tr>
<td>
<select id="cbo_start_hour" name="cbo_start_hour">
<option value="-1">Hour</option>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
<option>6</option>
<option>7</option>
<option>8</option>
<option>9</option>
<option>10</option>
<option>11</option>
<option>12</option>
</select>
<select id="cbo_start_minute" name="cbo_start_minute">
<option value="-1">Minute</option>
<option>00</option>
<option>15</option>
<option>30</option>
<option>45</option>
</select>
</td>
<td>
<select id="cbo_finish_hour" name="cbo_finish_hour">
<option value="-1">Hour</option>
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
<option>6</option>
<option>7</option>
<option>8</option>
<option>9</option>
<option>10</option>
<option>11</option>
<option>12</option>
</select>
<select id="cbo_finish_minute" name="cbo_finish_minute">
<option value="-1">Minute</option>
<option>00</option>
<option>15</option>
<option>30</option>
<option>45</option>
</select>
</td>
<td>
<select id="cbo_am_pm" name="cbo_am_pm">
<option value="-1">AM/PM</option>
<option>AM</option>
<option>PM</option>
</select>
</td>
<td>
<input type="button" value="Start Time" onClick="start_time()" class="btn_submit">
</td>
</tr>
</table>
Re: get minutes from selected hours
Convert your date representation to Javascript Date object instances and perform validation using those. Subtract the two date instances to get the delta amount of milliseconds between the two.
