Watches will forever be a classic, but they’re not as automatic as say, your iPhone when it comes to keeping the right date from month to month. The Timex Expedition Indiglo wristwatch is a reliable option that displays the time and date, has an alarm, and—here’s the best part—illuminates at the press of a button.

But before wearing your watch and relying on it throughout your day in class, at work, or while exercising, here are a few simple steps to make sure you know how to keep the date accurate as needed.

Pull the plastic guard from beneath the crown knob (located on the right edge of the watch) and push the crown knob into the watch to start your watch. You’ll see the second hand begin to move.

The crown knob has three positions: “In,” “Middle,” and “Out.” Pull the crown knob out to the middle position to set the day. Turn it clockwise to advance the days up, until the current day appears in the window on the right side of the watch face. Turn the knob counterclockwise to move the date down in number. Push the crown knob all the way in to start the watch.

If the day doesn’t change with the knob in the middle position, pull the crown knob completely out and cycle the time backward or forward through 24-hour periods until you arrive at the current day. Push the knob in to start the watch.

Pull the knob out to the middle position and adjust your date to the next month for months that have less than 31 days. Your watch will cycle through 31 days every month, so manual adjustments for shorter months are required.