Ruby / Ruby on Rails : How to get local time without Daylight Savings from the local time with Daylight Savings specified by the user ?
===

In a web application I'm developing (Ruby on Rails), the user can specify a local time of any location in the world. 
(That location is nothing to do with the user's location or the server's location.) 

And if Daylight Savings time is used at that location, the user types that time. 
I need to get the local time without Daylight Savings for the location from the specified Daylight Savings time. 

e.g. The server is in San Francisco. The user is in New York. During the summer time, the user enters the local time (with Daylight Savings) of Minneapolis. And I need to get the equivalent local time of Minneapolis without Daylight Savings offset. 

How can I do this? 

Any help will be greatly appreciated? 

