const am: number = s.search("AM")
    const pm: number = s.search("PM")
    const timeText: string[] = s.split(":")
    
    if (am > 0) {
        if (timeText[0] === "12") {
            return "00:"+timeText[1]+":"+timeText[2].slice(0,2)
        }else {
            return s.slice(0, am)
        }
    } else if (pm > 0) {
        return (timeText[0] === "12" ? timeText[0] : parseInt(timeText[0])+12)+":"+timeText[1]+":"+timeText[2].slice(0,2)
    }