I still use a diary to chronicle the comings and goings of my life, in the summer months especially I still have to keep a colour coded note of who is staying in which room and for how long - otherwise I would get totally confused when visitors arrive. All my appointments, husband’s business trips, childminding duties get recorded - plus ‘to do’ notes etc.
I have only recently discarded some of my older diaries and flicking through them transported me back to my university days, and to counselling and social work jobs. There were details of funerals and weddings I’ve had a role in, hospital stays, random notes about family and friends - reminders, gardening notes etc. I would have saved them except I know they were meaningful only to me and my children wouldn’t be very interested in their contents, having lived through the same events one step removed.