Update set messsage API to parse expires_at with offset

When a user, who is in a different timezone from the server,
attempts to update the message, this API is called with an
offset for expires_at. With this change, such users should
be able to update the banner as well.

Change-Id: Ia362389ceecc4a2c7ad09c79cede47d93c6e3e27
1 file changed