Binding a Grails date from params in a controller

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Grails Version >= 2.3

A setting in Config.groovy defines the date formats which will be used application-wide when binding params to a Date

grails.databinding.dateFormats = [
        'MMddyyyy', 'yyyy-MM-dd HH:mm:ss.S', "yyyy-MM-dd'T'hh:mm:ss'Z'"
]

The formats specified in grails.databinding.dateFormats will be attempted in the order in which they are included in the List.

You can override these application-wide formats for an individual command object using @BindingFormat

import org.grails.databinding.BindingFormat

class Person { 
    @BindingFormat('MMddyyyy') 
    Date birthDate 
}

Grails Version < 2.3

i can’t and will not belief that extracting the date by hand is nessesary!

Your stubbornness is rewarded, it has been possible to bind a date directly since long before Grails 1.3. The steps are:

(1) Create a class that registers an editor for your date format

import org.springframework.beans.PropertyEditorRegistrar
import org.springframework.beans.PropertyEditorRegistry
import org.springframework.beans.propertyeditors.CustomDateEditor
import java.text.SimpleDateFormat

public class CustomDateEditorRegistrar implements PropertyEditorRegistrar {

    public void registerCustomEditors(PropertyEditorRegistry registry) {

        String dateFormat="yyyy/MM/dd"
        registry.registerCustomEditor(Date, new CustomDateEditor(new SimpleDateFormat(dateFormat), true))
    }
}

(2) Make Grails aware of this date editor by registering the following bean in grails-app/conf/spring/resources.groovy

beans = {
    customPropertyEditorRegistrar(CustomDateEditorRegistrar)
}

(3) Now when you send a date in a parameter named foo in the format yyyy/MM/dd it will automatically be bound to a property named foo using either:

myDomainObject.properties = params

or 

new MyDomainClass(params)

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