Get time from other country

[MyEarth]

Hi guys

I need to get time of different city, London, Jerusalem, Mosca and many others. My starting script:

#include <Date.au3>

Local $iUTC, $iHour, $iMinute, $iSecond
$iUTC = _Date_Time_GetSystemTime()
$iHour = DllStructGetData($iUTC, "Hour")
$iMinute = DllStructGetData($iUTC, "Minute")
$iSecond = DllStructGetData($iUTC, "Second")
ConsoleWrite("+UTC: " & $iHour & ":" & $iMinute & ":" & $iSecond & @CRLF)

My idea was start from UTC time and then add-remove hours. But what about the DST, Daylight Savings Time? How i can know if in a country is active or not? There is an API? Example with _Date_Time_GetTimeZoneInformation it will give the current time zone settings and not for other time zone. I don't have understand if is possible or not 

On the help i have found SystemTimeToTzSpecificLocalTime but i don't have understand how to use for other time zone...

Thanks

Edited February 16, 2017 by MyEarth

[rootx]

TIMEZONE                    SOLAR           LEGAL
Eastern Time Zone           EST (UTC-5)     EDT (UTC-4)
Central Time Zone           CST (UTC-6)     CDT (UTC-5)
Mountain Time Zone          MST (UTC-7)     MDT (UTC-6)
Pacific Time Zone           PST (UTC-8)     PDT (UTC-7)
Alaska Time Zone            AKST (UTC-9)    AKDT (UTC-8)
Hawaii-Aleutian Time Zone   HAST (UTC-10)   Hawaii do not use it

to do what you want before you have to understand some differences, so start from here and then calculates the differences

[MyEarth]

I have make some progress:

EDIT: Removed, see #10

I still need to know WHEN the DST (Daylight Savings Time) start and when end! Please an help with that, thanks

Check this page for more info:

TIME_ZONE_INFORMATION structure

Edited February 25, 2017 by MyEarth

[JLogan3o13]

One of our regex gurus would be better able to assist with the parsing, but have you thought about just querying Google and then parsing your response? Something like:

https://www.google.com/?gws_rd=ssl#q=time+in+london

 

 

[mLipok]

Maybe this solution:

??

 

[LarsJ]

Take a look at World Clock(s) - (by cities) . Some COM code is broken in AutoIt 3.3.14 but it runs very well in 3.3.12.

[MyEarth]

If i need to use internet i prefer to switch to something "professional" like an NTP server like windows does but the problem is still the same, the DST. I don't know how to extract this information from the TIME_ZONE_INFORMATION structure, are both there ( StandardDate and DaylightDate )

Edited February 20, 2017 by MyEarth

[MyEarth]

This article is very intresting:

A Time Zone API supplement

Someone can traslate it? Please

It will resolve all my problem. Enumerate time zones and check the DST...

Sorry for the new post, a refresh problem of the browser.

Edited February 20, 2017 by MyEarth

[MyEarth]

Let we check at one of the function?

expandcollapse popup

/*
 * TZIEnum
 *
 * Get the list of TimeZones
 * Param:
 *      TIME_ZONE_INFORMATION pTZI  : The Time Zone Infomation array
 *      UINT cbTZI                  : Size of Array to fill
 * Return:
 *      UINT                        : Count of TZI structures enumerated
 *      The structures will be filled in in the TZI array
 */

extern "C"
UINT WINAPI TZIEnum(TIME_ZONE_INFORMATION *pTZI, UINT cbTZI)
{
    HKEY hKey;

     // Open the registry key where MS hides the Time Zones
    if( RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones"), 0, KEY_READ, &hKey) == ERROR_SUCCESS )
    {
         // Get the number of time zones
        DWORD dwKeyCount;
        if( RegQueryInfoKey(hKey, NULL, NULL, NULL, &dwKeyCount, NULL, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS )
        {
             // Empty?
            if( cbTZI == 0 )
            {
                RegCloseKey(hKey);
                return (UINT)dwKeyCount;
            }
             // Limit to what is available
            if( cbTZI > (UINT)dwKeyCount ) 
                cbTZI = (UINT)dwKeyCount;

             // Fill in the Standard Names
            for( UINT iIndex = 0; iIndex < cbTZI; ++iIndex )
            {
                DWORD dwLen = _countof(pTZI[0].StandardName);
                RegEnumKeyEx(hKey, iIndex, pTZI[iIndex].StandardName, &dwLen, NULL, NULL, NULL, NULL);
            }

             // Loop through the list using the standard names
            TZREG   tzr;
            for(UINT i = 0; i < cbTZI; ++i)
            {
                HKEY hKeyItem;
                 // Open the TZREG structure
                if( RegOpenKeyEx(hKey, pTZI[i].StandardName, 0, KEY_READ, &hKeyItem) == ERROR_SUCCESS )
                {
                     // Get the TZREG structure
                    DWORD dwLen = sizeof(pTZI[0].DaylightName);
                    DWORD dwType = REG_SZ;
                    RegQueryValueEx(hKeyItem, _T("Dlt"), NULL, &dwType, (LPBYTE)pTZI[i].DaylightName, &dwLen);
                    dwLen = sizeof(TZREG);
                    dwType = REG_BINARY;
                    RegQueryValueEx(hKeyItem, _T("TZI"), NULL, &dwType, (LPBYTE)&tzr, &dwLen);

                     // Copy the TZREG to the TZI
                    pTZI[i].Bias = tzr.Bias;
                    pTZI[i].DaylightBias = tzr.DaylightBias;
                    pTZI[i].DaylightDate = tzr.DaylightDate;
                    pTZI[i].StandardBias = tzr.StandardBias;
                    pTZI[i].StandardDate = tzr.StandardDate;

                     // Close the item
                    RegCloseKey(hKeyItem);
                }
            }
        }
         // Close the registry
        RegCloseKey(hKey);
    }
    else
        return 0;

     // Return the count
    return cbTZI;
}

 // Standard DoW calculation
static
int dayofweek(int y, int m, int d) /* 0 = Sunday / int y, m, d; / 1 <= m <= 12, y > 1752 or so */ 
{ 
    static int t[] = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4}; 
    y -= m < 3; 
    if( m > 1 ) --m;
    return (y + y/4 - y/100 + y/400 + t[m%12] + d) % 7; 
}

As you can see most of the code is the same of what i have done at #3, looking at the key and get the info. Missing the last part, convert registry TZI values into TIME_ZONE_INFORMATION struct

// Copy the TZREG to the TZI
pTZI[i].Bias = tzr.Bias;
pTZI[i].DaylightBias = tzr.DaylightBias;
pTZI[i].DaylightDate = tzr.DaylightDate;
pTZI[i].StandardBias = tzr.StandardBias;
pTZI[i].StandardDate = tzr.StandardDate;

 

Edited March 1, 2017 by MyEarth

[MyEarth]

edit

Edited March 1, 2017 by MyEarth
wrong code