Anecdotal evidence: timezone-aware precision might be only necessary for those pushing it to very edge of the allowances, but travel log spreadsheet was very very real for me, and everyone else in my own immigrant bubble. I still have it somewhere.

UK officials seem to operate on vibes though, not obsessive precision - I witnessed missed presence days being successfully propped up with a good sob story, but I can imagine it still being useful if you need to appeal a case where vibe turned against you.

Then was a short rest between making oath and Brexit, and here we are at that shit again - spreadsheet is back, and there's a script for Schengen rolling days.

“Vibes” sometimes work against you. This is a great app for documenting that you met the rules if you need to.

Back in 2000, entry to Canada was based on vibes. I had no idea what I was doing but looking back I don’t think they’d let someone in who forgets their DL, passport, and is on a “management consultant visa”.