Those instructions are for use with TiddlyWiki Classic.
Modern TiddlyWiki (v5+) uses a different approach.
To change the display of the modification date in the tiddler header:
1) from the sidebar, open the "advanced search" tiddler (click on the magnifying glass next to the search input field)
2) in the "Shadows" tab, search for
$:/core/ui/ViewTemplate/subtitle
3) open that tiddler, and edit it
4) note this widget:
<$view field="modified" format="relativedate"/>
5) To format the date the way you want, change this to:
<$view field="modified" format="date" template="YYYY-0MM-0DD 0hh:0mm"/>
It's even easier to change the date format used in the Recent tab in the sidebar:
Using the "advanced search" tab again, search for
$:/language/RecentChanges/DateFormat
Then, edit that tiddler and change the content to your desired date format string.
That should do it.
enjoy,
-e
Eric Shulman
ELS Design Studios
TiddlyTools - "Small Tools for Big Ideas!"
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