#include <iostream>
using namespace std;

typedef long long LL;
const LL LINF = 0x3f3f3f3f3f3f3f3f;
const int INF = 0x3f3f3f3f;

int month[13] = { 0, 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

bool leap(int year) {
    if (year % 4 || (!(year % 100) && year % 400))
        return false;
    return true;
}

bool goodtime(int year, int mth, int day, int hour, int min, int scd) {
    if (year <= 0 || mth <= 0 || mth > 12 || day <= 0 || day > 31 || hour < 0 || hour > 23 || min < 0 ||
        min > 59 || scd < 0 || scd > 59)
        return false;
    if (leap(year))
        month[2] = 29;
    else
        month[2] = 28;
    if (month[mth] < day)
        return false;
    return true;
}

LL Time(int year, int mth, int day, int hour, int min, int scd) {
    LL ans = 0;
    if (leap(year))
        month[2] = 29;
    else
        month[2] = 28;
    while (year > 400) {
        year -= 400;
        ans += (400 * 365 + 97);
    }
    while (year > 100) {
        year -= 100;
        ans += (100 * 365 + 24);
    }
    while (year > 4) {
        year -= 4;
        ans += (4 * 365 + 1);
    }
    ans += (year - 1) * 365;
    for (int i = 1; i < mth; i++) {
        ans += month[i];
    }
    ans += (day - 1);
    ans *= 24;
    ans += hour;
    ans *= 60;
    ans += min;
    ans *= 60;
    ans += scd;
    return ans;
}

int main() {
    int T;
    int year, mth, day, hour, min, scd;
    LL ans, T1, T2;
    scanf("%d", &T);
    while (T--) {
        scanf("%d/%d/%d %d:%d:%d", &year, &mth, &day, &hour, &min, &scd);
        if (!goodtime(year, mth, day, hour, min, scd)) {
            printf("-1\n");
            scanf("%d/%d/%d %d:%d:%d", &year, &mth, &day, &hour, &min, &scd);
            continue;
        }
        T1 = Time(year, mth, day, hour, min, scd);
        scanf("%d/%d/%d %d:%d:%d", &year, &mth, &day, &hour, &min, &scd);
        if (!goodtime(year, mth, day, hour, min, scd)) {
            printf("-1\n");
            continue;
        }
        T2 = Time(year, mth, day, hour, min, scd);
        ans = T1 - T2;
        if (ans < 0)
            ans = -ans;
        printf("%lld\n", ans);
    }
    return 0;
}