1、使用COleDateTime和COleDateTimeSpan类获取当月天数

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int GetThisMonthDays()
{
    COleDateTime time, nextMonth;
    SYSTEMTIME stLocal;
    GetLocalTime(&stLocal);
    time.GetAsSystemTime(stLocal);
    time.SetDateTime(time.GetYear(), time.GetMonth(), 1, 0, 0, 0);
    if (time.GetMonth() >= 12)
    {
        nextMonth.SetDateTime(time.GetYear() + 1, 1, 1, 0, 0, 0);
    }
    else
    {
        nextMonth.SetDateTime(time.GetYear(), time.GetMonth() + 1, 1, 0, 0, 0);
    }
    COleDateTimeSpan ts = nextMonth - time;
    return ts.GetDays();
}

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// 取某年某月的天数
int GetMonthDays(int year, int month)
{
    if (month > 12 || month < 1)
    {
        return -1;
    }
    COleDateTime time, nextMonth;
    time.SetDateTime(year, month, 1, 0, 0, 0);

    if (time.GetMonth() >= 12)
    {
        nextMonth.SetDateTime(time.GetYear() + 1, 1, 1, 0, 0, 0);
    }
    else
    {
        nextMonth.SetDateTime(time.GetYear(), time.GetMonth() + 1, 1, 0, 0, 0);
    }
    COleDateTimeSpan ts = nextMonth - time;
    return ts.GetDays();
}

2、获取时区

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int GetTimeZone()
{
    SYSTEMTIME t1, t2;
    GetLocalTime(&t1);
    GetSystemTime(&t2);
    int n = t1.wHour - t2.wHour;
    return n;
}

3、当时时间

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SYSTEMTIME stLocal;
GetLocalTime(&stLocal);

4、系统时间

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SYSTEMTIME stSys;
GetSystemTime(&stSys);