DateAndTimeInput
DateAndTimeInput is a Rails extension, providing a form input for DateTime attributes arranged as two input fields, for date and time, respectively.
Installation
$ gem install date_and_time_input
Usage
To use DateAndTimeInput in your view templates, you need to specify the input presentation as follows:
date_and_time_field :letter, :sent_at
or, as a form_for field:
f.date_and_time :sent_at
and that's it.