Define Source Drawing Modification Time

Purpose

The Define Source Drawing Modification Time function provides information to DWF reading applications about when the source file of the .dwf file was last modified.

Syntax

Time The number of seconds elapsed since midnight (00:00:00), January 1, 1970, coordinated universal time (GMT)

Desc Any humanly readable description of the time when the source file to the .dwf file was last modified

Details

Some DWF reading applications may need to "know" when the source file that was used to generate the .dwf file was last changed. The DWF generating application can satisfy this with the SourceModified opcode:

(SourceModified 820497600 'January 1, 1996')

Notes

DWF reading applications should not expect to be able to parse the Desc argument, though it could be shown to a user.

A .dwf file should contain at most one occurrence of the source modification time opcode, which by convention should be nested inside a Define Drawing Information Block opcode.

Default

By default no source drawing modification time is defined, which is equivalent to

(SourceModified 0 unknown)

Implementation in WHIP! Versions

See Also

Define Drawing Creation Time, Define Source Drawing Creation Time, Define Drawing Modification Time, and Define Drawing Information Block