Really love this. I try to keep my contracting work time tracking as simple as possible, but I really hate using the spreadsheet I use now. Going to give this a shot!
I use Excel and with a few simple formulas it creates a pivot table that prints a replica of exactly what to type into my time card at the end of the day.
I don't have access to org mode or any third party software so it works for me.
Also just realized you wrote it in Go. I’ve been slowly trying to pick up Go myself and digging through your source could help.