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10.8: Get Calendar to use System Highlight Color System 10.8
In iCal (10.7.4 and below) there was a Debug menu that among other handy features allowed the enabling of iCal to use the system highlight color for today. The feature still exists in Calendar (10.8 and above), but must be added manually to the preferences.

In order to enable this feature without the Debug menu all you must do is add the CalUIUseSystemHighlightColorForToday key to the ~/Library/Preferences/ preferences file using any plain text editor (both TextEdit and TextWrangler would work).

First quit Calendar, then edit the plist, and upon relaunching Calendar it should be using the system highlight color selected in the General» Appearance panel in System Preferences.

[crarko adds: I tried this with the 10.8.2 and I believe it worked. I opened the plist in BBEdit and copied and pasted an existing key/value combination, edited the key to match the name above, and set the value to true. I saw some highlighting respect this, although I can't say I'm completely sure what all the intended effects are. Perhaps the submitter will see this and clarify what to look for.]
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10.8: Get Calendar to use System Highlight Color | 3 comments | Create New Account
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10.8: Get Calendar to use System Highlight Color
Authored by: alexclst on Jan 08, '13 07:56:36AM

The only highlighting that this setting changes the behavior of is that of the highlighting of "today" in Week and Month views. Highlighted text, like when editing event details, already respected the system highlight color. It is worth noting that the highlighting for "today" uses the system highlight color, but uses a lighter shade of it than is used with text or file selection system-wide as can be seen when selecting text in an event's edit pane. Also, Calendar's default behavior follows the default highlight color, so unless you have chosen a different system highlight color in the General pane of System Preferences you probably won't see any effects of this hidden Calendar preference.

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10.8: Get Calendar to use System Highlight Color
Authored by: keirthomas on Jan 08, '13 12:47:53PM

Why edit the plist file?

Just use this command to activate the feature (quit Calendar first):

defaults write CalUIUseSystemHighlightColorForToday -bool TRUE

and this command to deactivate it (again, quit Calendar first):

defaults delete CalUIUseSystemHighlightColorForToday

Keir Thomas

Author of Mac Kung Fu
Over 400 tips, tricks, hints and hacks for OS X

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10.8: Get Calendar to use System Highlight Color
Authored by: petersconsult on Nov 20, '13 12:50:37AM

this does not seem to work for me in 10.9 (Mavericks)

Does anyone have this experience?

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