| REVDATE | Inserts or updates a block containing user name, current time and date, and drawing name |
| TIME | Displays the date and time statistics of a drawing
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| DATE | Stores the current date and time represented as a Julian date and fraction in a real number |
| TDCREATE | Stores the time and date the drawing was created |
| TDUPDATE | Stores the time and date of last update/save
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