Rails DateTime functions do not work properly

[ssandeep]

After adding runt gem to the rails project, some of the functions provided by Rails' DateTime do not work properly.

For eg,
DateTime.now + 1.day #gives some random date in 2035
DateTime.now + 2.hours #gives some random date in 2033

Any idea what might fix these issues?

[sundus-y]

This started to happen in rails 4.
What's happening is 1.day is returning a Fixnum instead of a Duration object.