src/js/utils/format-time.js
/**
* @file format-time.js
*
* Format seconds as a time string, H:MM:SS or M:SS
* Supplying a guide (in seconds) will force a number of leading zeros
* to cover the length of the guide
*
* @param {Number} seconds Number of seconds to be turned into a string
* @param {Number} guide Number (in seconds) to model the string after
* @return {String} Time formatted as H:MM:SS or M:SS
* @private
* @function formatTime
*/
function formatTime(seconds, guide=seconds) {
seconds = seconds < 0 ? 0 : seconds;
let s = Math.floor(seconds % 60);
let m = Math.floor(seconds / 60 % 60);
let h = Math.floor(seconds / 3600);
const gm = Math.floor(guide / 60 % 60);
const gh = Math.floor(guide / 3600);
// handle invalid times
if (isNaN(seconds) || seconds === Infinity) {
// '-' is false for all relational operators (e.g. <, >=) so this setting
// will add the minimum number of fields specified by the guide
h = m = s = '-';
}
// Check if we need to show hours
h = (h > 0 || gh > 0) ? h + ':' : '';
// If hours are showing, we may need to add a leading zero.
// Always show at least one digit of minutes.
m = (((h || gm >= 10) && m < 10) ? '0' + m : m) + ':';
// Check if leading zero is need for seconds
s = (s < 10) ? '0' + s : s;
return h + m + s;
}
export default formatTime;