Many older people lose track of time and become anxious and confused when they don’t remember what time it is or if it is day or night. Clocks help reduce anxiety about the time of day and will be a reminder for your Dad to get up, eat, or watch his favorite TV show, but you need one that he can easily see. You might need clocks in multiple rooms so he can find the time where ever he is. Here are some websites that offer clocks with big letters and displays AM and PM, or Day and Night.
http://www.day-clock.com (Displays words.Example ‘Now it‘s Monday Morning’)