Yesterday (Wednesday) I received a small job due on the morning of the 20th. I glanced at it, confirmed to myself that it was very small and easy and would take an hour tops, more likely half an hour, and decided to do it on Thursday. Last night, people were discussing the solstice. Somehow I got it in my mind that the 21st was on Friday, with the result that this morning I woke up and immediately thought "Shit, that job's due in at 08:00 - and is that BST or CET? - and I haven't even started it yet!" So I jumped out of bed, put some coal in the computer and got to work, in my best office pyjamas.
Luckily it was indeed a small and easy job, even if the person who'd worked on it before me seemed more akin to google translate than anything human, and probably more time was spent accessing systems (Across, are you listening?) than correcting. Sent it off, made my son's school lunch, took him to school, all calm - and then realised it's only the 19th today.