This  is good for people who use notepad to write down any info on a day to day basis..
1. Open a blank Notepad  file.
2. Write .LOG (in CAPS only)  as the first line of the file, followed by an Enter. Save the File and close it. 
3. Double-click the file to open it and notice that Notepad appends the  Current Date and Time to the end of the file and places the cursor on the Line  after.
4. Type your notes and then save and close the file.
5. Each time  you open the file, Notepad repeats the process, appending the Date and Time to  the end of the file and placing the cursor below it.