This sounds a bit like the town in Canada whose mayor must sign a proclamation each year to observe Daylight Savings Time by a certain date. If the mayor happens to be out fishing when this deadline comes and goes, DST does not get observed by the town.

 

I can't for the life of me remember the name of that place.

 

Cliff Hancuff

 

I think I understand now your reason for wanting dual time zones now, 
thanks.

I think, though, that Jonathan Hassid has his the nail on the head as 
far as Xinjiang time is concerned with his access to Guo's article, 
that there is no single change or date from Xinjiang time to Beijing 
time. It seems rather that different ministries and different 
localities switched at different times.