How to use GetTimeZoneInformation

[eranga262154]

Hi all,

I'm working on a dialog base application, dealing with the time zone details.

In the dialog box there is a text box to enter the time offset. Then user click the display button, on the next text box display the timezone name. If the given time offset have more than one timezone name, very first timezone name should be display.

That's my question.

I'm going to use Windows API for this. So that I want to read the timezone list. How can I do that using API with GetTimeZoneInformation()

[chemicalNova]

As I've mentioned to you multiple times.. there is no such thing as a "Timezone List". The timezones aren't stored on the computer anywhere (that is.. you can't use some magical API to list the timezones for you). Its just as useless as having an API that prints the numbers 0-100 for you on screen.. useless.

GetTimeZoneInformation, gets the offset for you.. thats it. You have to pre-program the timezone names, and offsets into your program. Then, use GetTimeZoneInformation to determine what the offset is, and have the default selection correspond to that.

chem

[eranga262154]

Ok, I'll explain it in this way.

Say I have a time offset, as a example +6:00, and I want to find the time zone name. That mean I have to read the list in the registry. So how can I do that.

Here is the list I'm talking about.

[chemicalNova]

Where is this list in the registry?

chem

[eranga262154]

This list is not in the registry, only the details of all time zones. Those are in following path.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones

[chemicalNova]

I don't have that information in my registry..

chem

[eranga262154]

I've work on XP, how about you.

[chemicalNova]

XP also..

chem

[eranga262154]

So it is there, actually not the list in my image. But all the details are provided. So, it should be there in the registry.

[chemicalNova]

It isn't.. I just checked.

It could possibly be added there by a program you have installed..

chem

[eranga262154]

I don't have installed any program. How did you check the registry, I mean how to login.

[chemicalNova]

Start >> Run >> regedit.

chem

[eranga262154]

Ok, using admin account as well? So it should be there.

[chemicalNova]

Yes.. there is only an Administrator account on this PC.. theres nothing there.

chem

[eranga262154]

Oh dear, I don't why is that. I've check it on few machines and it is there in all of them.

[eranga262154]

Dose anyone know how to work with RegEnumValue() to enumerate the registry keys.