Write your own browser extension
In my day to day work I’m often reading a lot of database records that are sorted by time, usually using unix timestamps. The problem I usually have with this is when I view these records via some sort of web portal the numbers are a bit meaningless - I can’t tell by eye if 1575468821
is an older date than 1575598821
without a little reading. Realising that I could do with a tool that automatically converted these for me I decided to bite the bullet and write a simple extension called stampy for Chrome (and Firefox). It turns out writing one is easy and this post details how I wrote mine.