Uniqueness validation based on the date in a datetime field

Uniqueness validation based on the date in a datetime field

References

Reference NO 1

http://stackoverflow.com/questions/15205321/uniqueness-validation-based-on-the-date-in-a-datetime-field

Reference NO 2

http://book.cakephp.org/2.0/en/models/data-validation.html

Reference NO 3

https://docs.djangoproject.com/en/dev/ref/models/fields/

Reference NO 4

http://office.microsoft.com/en-us/access-help/create-a-validation-rule-to-validate-data-in-a-field-HA010096312.aspx

Reference NO 5

https://mongoengine-odm.readthedocs.org/en/latest/guide/defining-documents.html

Reference NO 6

https://github.com/srkirkland/DataAnnotationsExtensions/issues/46

Reference NO 7

http://login.salesforce.com/help/doc/en/tips_on_building_formulas.htm

Reference NO 8

http://mongoid.org/en/mongoid/docs/validation.html