It's almost done (it would take one or two weeks to clean it up for FOSS release). It's a CLI tool. It works great for my use case, but I'm wondering if there's any interest in a tool like this.
Say you have a simple time-tracking tool that tracks what you do daily. The only problem is that there are gaps and whatnot, which might not look nice if you need to send it to someone else. This tool fixes pretty much all of that.
Main format is a JSON with a "description", and either "duration" or a "start"/"end" pair. It supports the Timewarrior format out of the box (CLI Time tracking tool).
I do my time tracking in org-mode, and export it to JIRA once a day or so. It is quite a specific/tailored setup, written in a mix of elisp and, well, org-mode (specific names and tags are used to configure some settings), but I'd love to look at this tool to see if I can extend my workflow by using it for the "massaging into a nicer shape" part. I might end up writing some extensions for either side (org-mode input format and JIRA REST calls output format).
My current tooling quantizes everything by rounding start and end times to the nearest full 15 minutes, and starting a new task at the end time of the previous one when clocking in, so that my team lead does not have to report so many fractions of hours to higher layers.