I play tournament Texas Holdem each week starting at 6.00 PM and setup the following timer to handle the blinds increasing every 30 minutes.

Start by Setting a Calendar Event as follows:

Select Date and Enter Following Event

Title:
ROUND 1
BLINDS $100 $200

Details:
Start Time: 6:00 PM
End Time: 6:30 PM
SET Alarm: 0 Minutes

Category: Edit to create New "Poker" entry. This will prevent viewing of your personal events if others look at it.