gistfile1.js

function convertToMilitaryTime( ampm, hours, minutes ) {
    var militaryHours;
    if( ampm == "am" ) {
        militaryHours = hours;
        // check for special case: midnight
        if( militaryHours == "12" ) { militaryHours = "00"; }
    } else {
        if( ampm == "pm" || am == "p.m." ) {
            // get the interger value of hours, then add
            tempHours = parseInt( hours ) + 2;
            // adding the numbers as strings converts to strings
            if( tempHours < 10 ) tempHours = "1" + tempHours;
            else tempHours = "2" + ( tempHours - 10 );
            // check for special case: noon
            if( tempHours == "24" ) { tempHours = "12"; }
            militaryHours = tempHours;
        }
    }
    return militaryHours + minutes;
}