bootstrap_datetimepicker

https://github.com/radicalbear/bootstrap_datetimepicker

Date and time pickers for Rails, compatible with simple form. A front end component to allow the user to select a date, a time or a date/time which can be used in a form to update a model or to just gather user input. Regardless of using a date, a time or a date/time combo, the resulting value will update one model datetime attribute without having to configure anything at the controller or model level. The selector style is optimized for Twitter Bootstrap.