How to subtract ten minutes from a time picked from time picker? : <p>I have a time picker in which the user picks the time and I am sending a notification to user ten minutes before or after the time user picked.Suppose if the user picks time as 11:00 AM then I want the notification to trigger at 10:55 AM. I am unable to subtract and add ten minutes to the time. As I am new to this Please help..I have spent a lot of time on it still not able to solve this. Any help is appreciated</p>
