Some states require a specific number of instructional days or hours. Others require nothing at all. Before building any tracking habit, find out which applies to you, because tracking attendance you will never be asked for is pure overhead.
Where it is required, the record needed is usually far lighter than people assume. A count of days, not a timetable.
What counts as a school day
More than people expect. A museum visit, a long piece of reading, a project afternoon, a cooking session that was genuinely maths, and a day spent on one subject all generally count.
Requirements are usually expressed as days of instruction or hours of instruction, not as days that resembled a classroom. Learning that happened outside a table and a workbook still happened.
The lightest record that works
If your state counts days, this is enough.
3 things to do
Ticks are for this visit only. Nothing here is saved anywhere.
Count as you go, because June reconstruction does not work
Reconstructing a year of attendance from memory is genuinely impossible, and unlike subject records there is nothing physical to work backwards from. There is no pile of undated worksheets that proves you did one hundred and eighty days.
A grid you tick takes seconds a day. It is the one part of homeschool record keeping where doing it live is not merely better but effectively the only option.
What is pointless
Logging start and finish times, unless your state specifically requires hours. Recording which parent taught. Breaking a day into subject-by-subject minutes.
None of that is asked for anywhere, and every additional column is a reason the habit dies by half term.
Where to check what applies to you
State requirements vary widely and change, so confirm with your state association or department of education. The overall picture is in record keeping requirements by state.