# getNotBefore method

DateTime getNotBefore()

Gets the the date in local time when a certificate becomes valid.

return The date in local time when a certificate becomes valid. throws BiosealException An error has occurred during Bioseal Library execution.

## Implementation

    DateTime getNotBefore() {
      DateTime notBefore = DateTime();
      var err = biosealSDK.id3BiosealCertificateInformation_GetNotBefore(_pHandle.value, notBefore.handle);
      if (err != BiosealError.success.value) {
        notBefore.dispose();
        throw BiosealException(err);
      }
      return notBefore;
    }