TimeZoneInfo class in mql4

Just wondering if anybody has used the TimeZoneInfo class in Mt4/Mql4 to determine daylight savings time?

I've just had a play with it in a .NET console app and it does what I need, merely returning boolean for if a given datetime is daylight savings time for a specified timezone (NOT the server timezone).
But migrating this into MQL4 is going to be a bit more of a challenge for me and C++ code examples on the net are thin on the ground.

I'm not sure at this stage whether I should try write my own DLL for the job or not. I'd appreciate some advice if anybody has it!

I don't have the code, but I think it is in FF Cal.

Thanks, that's close but I'm not sure whether it can be used with a datetime you have passed into it. It appears to only work with the computer's time.

I have written a basic DLL that returns a bool value when you pass in the timezoneid string and date of your choice.

It's a bit rough so it won't be for public consumption - at least at this stage in its life.

I'll test with it a bit more this week but seems promising so far!