Sharepoint Regional settings based on host's IP

I am trying to change regional settings for a user based on location from where he/she opens a SharePoint site . Right now there are a few APIs that provide such functionality based on host's IP address, but we cannot use them.

Suppose a I am accessing site from any location in India, Time zone in my regional settings should be  (UTC+05:30) Chennai, Kolkata, Mumbai, New Delhi and it should change if I open site from another location. Any JavaScript , c sharp code or approach that can achieve this will be helpful.

Thanks in advance for your help,

Vivek