Omega Constellation watches have a long-standing reputation as fine timepieces. They are also durable, with many of them still fully operable decades after their manufacture. If you have come across one of these watches somewhere or had one handed down to you, you may be unfamiliar with all of its functions. A first glance at the Constellation may lead you to believe that adjusting its settings is difficult, but setting the date is straightforward.
Start the process of changing the date on your Omega Constellation sometime between 2 a.m. and 8 p.m. and avoid the opposite hours (8 p.m. and 2 a.m.). Do this so that you are not changing the settings while the watch is going through its automatic date-change.
Pull the crown of the watch out to position two. You can identify this position by feel. As you pull the crown head away from the watch, stop once you feel the first "click." If you feel two clicks, you have gone too far, and you need to push the crown back toward the watch one click.
Watch the date display and turn the crown backward or forward to change the date. Move it as needed to get the correct date.
Push the crown back up against the watch to complete the job.