The shortest day of the year happened over the weekend. The first day of winter was Saturday. It should also serve as a reminder to check your smoke detector. Fire officials say the batteries in your smoke detector should be changed every 6 months. They add that while you have your smoke detector down, you should also check the manufacture date. If it’s older than 10-years, it’s time to get a new one. You can find out more by going to SLO City dot Org.