We have been using numbers very often in our programs. This time we do some text manipulation. The data type used for text is called String. We discover how we can use the "+" character to join strings and test date and time functions like year(), month(), day(), hour(), minute() and second(). We create a small running clock and discover how to force a number to be printed always using two digits using the nf() function. nf() means "number format". To end the episode, we use a function called charAt(0) which returns one of the characters of a string (for example the first letter, or the third one), and another function called indexOf("t"), which tells us where in the string a certain letter is found. For example, find out where inside our string is the letter "t". Processing will return a number indicating the position, or -1 if the letter is not found.