YYYYMMDD or YYYYMMDDHHMMSS

Means a date or a date and time.

Example: 20040210 would indicate 10 February 2004.

If this is used as the first part of each filename the computer will sort the files by chronological order.

This can be expanded to include the hours, minutes, and seconds as shown below

Example: 20040401174233 indicates 01 April 2004 at 17 hrs 42 min and 33 seconds

20040401174233 bold shows the year

20040401174233 bold shows the month of the year

20040401174233 bold shows the day of the month

20040401174233 bold shows the hour of the day in 24 hour notation

20040401174233 bold shows the minute of the hour

20040401174233 bold shows the seconds of the minute