In the planning board you can set the period to day, week or month.
Using the arrows you can browse to the previous or next period. When you click on today, you automatically go to today's period.
It is also possible to use keyboard shortcuts, so you can switch even faster to the period you want to see. These are the keyboard shortcuts: "D", "W" and "M".
D: zoom by day
W: zoom by week
M: zoom by month