set_date_sent

Sets sent date (the Date header) of the associated message.

This property is considered static, in a meaning that it should not change during the life-time of the this, the same as it doesn't change in the associated message.

If the this changed, the 'dirty' flag and the 'folder-flagged' flag are set automatically, unless the this is aborting notifications. There is not emitted folder's "changed" signal for this this.

Parameters:

this	a MessageInfo
date_sent	a sent date to set

Returns:

Whether the value changed.