Different Program per day

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I just thought that it would be great to be able to have a specific program to follow for different days of the week. For example, one may be able to set the "day" mode to be active during in the evening during weekdays, and follow the natural cycle on weekends. This will be helpful for those who have work and only get to enjoy their tanks at night (instead of just seeing the night mode) and on weekends (during daytime).