My iCal invites are being sent at GMT

Hi All,

When I make an iCal invitation, the recipient is receiving something akin to the following:

XXXX has accepted your invitation to the event: XXXXX, scheduled for 12 October 2015 at 3:30 AM (GMT).

but they're not at GMT, so the time appears incorrect (this example is a 2:30pm meeting in my time zone).

If they accept the invitation, it enters it in the correct time, but the email asking for acceptance should really be in the correct timezone too.

how can I correct this?

cheers