if a users text = !gmt + 3

$1 == !gmt
$2 == +
$3 == 3

They are seperated by spaces.

Text = Hello my name is Travis.
$1 = Hello
$2 = my
$3 = name
$4 = Travis.

Quote:

User Text = !gmt + 3

echo -a $asctime($calc($gmt $2 ($3 * 3600)))