Interstitial journaling is a productivity/journaling technique where you add timestamped journal entries on what you were doing whenever you take a break or switch what you work on.
Anne-Laure Le Cunff shared this example in Interstitial journaling: combining notes, to-do & time tracking
The basic idea of interstitial journaling is to write a few lines every time you take a break, and to track the exact time you are taking these notes. For instance:
10:04 - Going to finish the first draft of the mindful productivity article. 10:46 - I fell into a Twitter blackhole again! Back to work. 11:45 - Made good progress. Need to get ready for meeting with Charlie. 11:49 - Reviewed agenda and docs. Feeling a bit anxious, but I think it will go fine. Need to call Anna after the meeting to debrief.
For Obsidian, there’s a community plugin Timestamper that allows you to define a format and then attach the action to a hotkey.
This is used in My productivity app is a never-ending txt file by Jeff Huang.
You can also use Record journal entries from command line with jrnl to do interstitial journaling directly from command line.