There’s a thin bit of Afghanistan separating Pakistan and Tajikistan, and it reaches all the way to the Chinese border. That tiny bit of border (which is closed on the Chinese side and also a mountain pass thousands of metres high, but it is indeed a border) has a three and a half hour difference
Biggest difference i found was the china pakistan border, 3 hours. China is also all in one timezone which must create problems.
There’s a thin bit of Afghanistan separating Pakistan and Tajikistan, and it reaches all the way to the Chinese border. That tiny bit of border (which is closed on the Chinese side and also a mountain pass thousands of metres high, but it is indeed a border) has a three and a half hour difference
Honestly, it probably solves more problems.