Day 12 is checking the value of time.
If the given value is 13:58 will gives true value as a valid time.
If the given value is 25:51 will gives false value as a not valid time.
If the given value is 02:76 will gives false value as a not valid time.
This is the JavaScript solution
function validTime(str) { let [hour, min] = str.split(':').map(val => parseInt(val)); let hoursMark = false, minsMark = false; if(hour >= 0 && hour < 24){ hoursMark = true; } if (min >= 0 && min < 60) { minsMark = true; } if(hoursMark && minsMark === true) { return true; } else { return false; } } 
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