Internet Direct (Indy) Version 9.0.1 Beta
TIdEntityHeaderInfo.Date
Indicates the origin date and time for an HTTP message.

property Date: TDateTime;
Description
Date is a TDateTime property that indicates the origin date and time for an HTTP message. Origin servers must include a Date value in all responses, except in the following cases:

A received message without a Date header must have a Date header value constructed on the client after receipt.

A message sent by a client can contain an optional Date header value if the message has an entity body, as in HTTP PUT and POST requests.