Created
April 10, 2019 20:27
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| exports.at = at; | |
| function at(hours, minutes) { | |
| let hr = hours; | |
| let min = 0; | |
| if (minutes) { | |
| hr += Math.floor(minutes / 60); | |
| min = minutes; | |
| } | |
| // overflow calculations for hours and minutes | |
| hr = (hr >= 0 ? hr % 24 : 24 + hr % 24); | |
| min = (min >= 0 ? min % 60 : 60 + min % 60); | |
| return formatTime(hr) + ':' + formatTime(min); | |
| } | |
| function formatTime(time) { // used to format both hours and minutes | |
| if (time < 10) { // if hours/minutes is a single digit number, prepend 0 | |
| return '0' + time.toString(); | |
| } else { | |
| return time.toString(); | |
| } | |
| } | |
| String.prototype.plus = function(minutes) { | |
| let time = this.split(':'); | |
| let hr = parseInt(time[0]); | |
| let min = parseInt(time[1]); | |
| min += minutes; | |
| hr += Math.floor(min / 60); | |
| min %= 60; | |
| hr %= 24; | |
| return formatTime(hr) + ':' + formatTime(min); | |
| }; | |
| String.prototype.minus = function(minutes) { | |
| let time = this.split(':'); | |
| let hr = parseInt(time[0]); | |
| let min = parseInt(time[1]); | |
| min -= minutes; | |
| hr += Math.floor(min / 60); | |
| min = (min >= 0 ? min % 60 : 60 + min % 60); | |
| hr = (hr >= 0 ? hr % 24 : 24 + hr % 24); | |
| if (hr % 24 === 0) hr %= 24; // handles negative integer multiples 24 | |
| return formatTime(hr) + ':' + formatTime(min); | |
| }; | |
| String.prototype.equals = function(time2) { | |
| return this === time2; | |
| }; |
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