You can add special text to notes and commands that will expand to something meaningful when the reminder is run.
Ex: It is currently +dayname+ and you are listening to +soundfile+!
Translation: It is currently Thursday and you are listening to alarm01.ogg
+date+
The current date as specified by the format in preferences
Ex: 12/13/2012
+month+
The current month as a number
Ex: 12
+monthname+
The full name of the current month
Ex: December
+day+
The current day of the month
Ex: 13
+dayname+
The current day of the week
Ex: Thursday
+yearday+
The current day of the year
Ex: 235
+year+
The current year
Ex: 2012
+time+
The current time as specified by the format in preferences
Ex: 8:44PM
+hour+
The current hour (in 24 hour time)
Ex: 14
+hour12+
The current hour (in 12 hour time)
Ex: 1
+minute+
The current minute
Ex: 44
+second+
The current seconds
Ex: 01
+microsecond+
The current microsecond
Ex: 023
+soundfullfile+
The soundfile (with the path) used in this reminder
Ex: /home/user/music/alarm01.ogg
+soundfile+
The soundfile (without the path) used in this reminder
Ex: alarm01.ogg
+command+
The command used in this reminder
Ex: firefox http://google.com
Note: you can't use this as an insert for commands