Often it is needed to put the current date in a file. At later times it will then be clear in what order parts of a program were made. This can be an invaluable tool for maintaining complicated software. The command <ctrl> - (control key and minus sign) puts the date in the text at the current position of the cursor. The date is given in the European format but with the month represented by three characters to avoid all misunderstanding. The date 23-jan-1990 was put in the text with the <ctrl> - command.