def DateCHToUS(date):
    #01.02.2010 --> 2010-02-01
    day=""
    month=""
    year=""
    for i in range(0,1+1):
       day+= date[i]
    for i in range(3,4+1):
        month+=date[i]
    for i in range(6,9+1):
        year+=date[i];
    newdate = year+"-"+month+"-"+day
    return(newdate)