Sometimes you can narrow it down by starting with the color scheme and then comparing the components which change over time. Bikepedia lists the Sedona as being built from 1995 to 2015. You can see all of the versions here 2012 Giant Sedona - BikePedia. Look at the year list on the right and see which ones match the color. An even quicker way is to look at the inner side of the crank arms. Most major manufacturers stamp a date code into the metal - month and year it was made. It's a good place to start out. You may also find date codes on the hubs but that is less frequent than crank arms.