Time fields in Castor only capture hours and minutes. If you would like to capture time in the format hh:mm:ss, you will need to use text fields. However, you can calculate with those as well.

To calculate the difference in time between two text fields that use hh:mm:ss, you can use the following template. The output will give the time difference in hh:mm:ss.

var timePoint_1 = '{text1}';
var timePoint_2 = '{text2}';
var split_1 = timePoint_1.split(':');
var split_2 = timePoint_2.split(':');
var date1 = new Date(0, 0, 0, split_1[0], split_1[1], split_1[2]);
var date2 = new Date(0, 0, 0, split_2[0], split_2[1], split_2[2]);
var timeDifference = new Date(date2 - date1);
var diff = Math.floor(timeDifference/1000);
var hours = Math.floor(diff/3600);
var minutes = Math.floor((diff-(hours*3600))/60);
var seconds = diff-(hours*3600)-(minutes*60);
if(hours < 10){
 hours = "0" + hours;
}
if(minutes < 10){
 minutes = "0" + minutes;
}
if(seconds < 10){
 seconds = "0" + seconds;
}
hours + ":" + minutes + ":" + seconds;

Replace text1 and text2 with your own variables