The basic syntax is as follows:

You can use any of the following commands:

• Zmanim - Provides requested Zmanim.  You don't actually need to type the word "Zmanim" - if your message does not begin with any of the commands listed below the bot will assume you entered a location.  Any of the following formats can be used in requesting Zmanim:
  
• Just enter a location. (Example: "New york")  This will give a standard set of Zmanim for today.
  
• Location and date separated by colons.  (Example: "New york: tomorrow" or "New york:4/16/2008")
• Location and specific zmanim separated by colons.  (Example: "New York: sunrise, earliest mincha")
• Location, date, and zmanim separated by colons. (Example: "New york: tomorrow: candlelighting" or "New york: candlelighting: April 25")

• Help - Gives information on the available commands.

• Map - Gives a link to a map of the location, with bearing to Yerushalayim calculated two different ways.  This is courtesy of KosherJava.
  Usage: "map location"
  
• List - Provides a list of all the Zmanim supported by ZmanimBot. 
• Comment - Sends a message to the people running the bot. 
• Credits - Gives basic information on the creators of ZmanimBot and what it is built on.