http://iscoresports.com/

Is there a way to stop the game clock when there is a delay or the game is interrupted and continued to another day?

Currently no. The idea is on FTM list for enhancements

Another way is to end the game during the rain delay. Then when the players take the field again, you press 'undo' and the game will start where it left. One of the advantages is the timer will be accurate.