import time
def timediffer(data1,data2):
    try:
        data1=time.strptime(data1,"%Y/%m/%d %H:%M:%S")
        data2 = time.strptime(data2, "%Y/%m/%d %H:%M:%S")
        if data2.tm_mon>12 or data2.tm_hour>=24 or data2.tm_min>=60 or data2.tm_sec>=60 or data2.tm_mday>31:
            return -1
        if data1.tm_mon>12 or data1.tm_hour>=24 or data1.tm_min>=60 or data1.tm_sec>=60 or data2.tm_mday>31:
            return -1
        else:
            x1=int(time.mktime(data1))
            x2=int(time.mktime(data2))
            result=x1-x2
            if result<0:
                result=x2-x1
            return result
    except:
        return -1
n=int(input())
for i in range(int(n)):
    l=list(input().split())
    data1=l[0]+' '+l[1]
    data2=l[2]+' '+l[3]
    differ=timediffer(data1,data2)
    print(differ)