First decide what you would like to happen. Guessing that if 0700 is after sunrise, don’t do anything?
If your Sunrise_Event Item really is a short-lived event, rather than a steady “daytime” indicator … you probably want to create a daytime Item. Then in your cron rule (and any other lighting rules) you can test to see if is dark (i.e.not daylight) before action.
Various helpful bits here
