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copied!<p>I'm guessing you're using the <code>date_select</code> helper to generate the tags for the date. Another way you could do it is to use select form helper for the day, month, year fields. Like this (example I used is the created_at date field):</p> <pre><code><%= f.select :month, (1..12).to_a, selected: @user.created_at.month %> <%= f.select :day, (1..31).to_a, selected: @user.created_at.day %> <%= f.select :year, ((Time.now.year - 20)..Time.now.year).to_a, selected: @user.created_at.year %> </code></pre> <p>And in the model, you validate the date:</p> <pre><code>attr_accessor :month, :day, :year validate :validate_created_at private def convert_created_at begin self.created_at = Date.civil(self.year.to_i, self.month.to_i, self.day.to_i) rescue ArgumentError false end end def validate_created_at errors.add("Created at date", "is invalid.") unless convert_created_at end </code></pre> <p>If you're looking for a plugin solution, I'd checkout the <a href="http://github.com/adzap/validates_timeliness/" rel="noreferrer">validates_timeliness</a> plugin. It works like this (from the github page):</p> <pre><code>class Person < ActiveRecord::Base validates_date :date_of_birth, on_or_before: lambda { Date.current } # or validates :date_of_birth, timeliness: { on_or_before: lambda { Date.current }, type: :date } end </code></pre> <p>The list of validation methods available are as follows:</p> <pre><code>validates_date - validate value as date validates_time - validate value as time only i.e. '12:20pm' validates_datetime - validate value as a full date and time validates - use the :timeliness key and set the type in the hash. </code></pre>

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