validation - Symfony2 backend datetime yml validatiion -

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i've been trying validate datetime field using yml (validation.yml) file. though validates "datetime type" doesn't validate "null" or "blank". i've tried using notblank , notnull.

  expirationstartdate:         - datetime: ~         - notblank: ~      expirationenddate:         - datetime: ~         - notblank: ~


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