AWS authentication requires a valid Date or x-amz-date header curl

I am trying for simple image upload using cURL by passing the required headers that is requested by AWS but I'm getting the below error...

<Code>AccessDenied</Code><Message>AWS authentication requires a valid Date or x-amz-date header</Message>

Below is the authorization header I'm passing in..

curl -X PUT -T "/some/file.jpg" \
-H "Host: bucket.s3.amazonaws.com" \
-H "Date: date" \
-H "Content-Type: image/jpg" \
-H "Authorization: AWS XXXXXXX:XXXXXXXXXX" \
  http://ift.tt/1vUvm8a

and below is how the signature is made,

signature=`echo -en ${stringToSign} | openssl sha1 -hmac ${s3Secret} -binary | base64`

I've tried passing the date in stringToSign and in the headers, but no luck.. Please help ..