Screenshot filename format changed recently (macOS Catalina, 10.15.6)

In the Terminal:

defaults write com.apple.screencapture name "Screenshot"
killall SystemUIServer

There appears to be no means to alter the strftime(1) formatting of the date/time stamp, or remove the word "at" in the output filename, as these are incorporated within the application itself.

My com.apple.screencapture.plist located in ~/Library/Preferences contains the following key that changes the Screen Shot text to Screenshot:

<key>name</key>
<string>Screenshot</string>

I don't know how to remove the at text.

You are welcome. I was aware of the Language & Region custom configuration for dates and times, but did not see where you were wishing to change that, so did not mention it. That would also alter the displayed date/time in the menu bar too.

Yes, sed to the rescue again. 🤓

I have the same question, and also a related one.

First, I certainly would want control over the date-time format. By default it should be taken from my system preferences setting.

Second, I use jpeg rather than png as png is a lot larger than jpeg. However, I seem no longer to be able to set the file name extension to "jpeg", it has become "jpg", thus leaving out the "experts" (as Microsoft used to do). We're beyond three-letter extension limits...

I want to set the format of the screenshot to jpeg, the file name to CCYY-MM-DD HH:MM:SS and the file name extension to .jpeg.

Should not be a great problem.

Sigh.