Normalizing Unix seconds by the number of seconds in a day, results in Unix day, which has convenient properties, such as 5th digit after decimal point corresponding to decimal second (0.864 length of traditional second). So, dividing UNIX SECOND by 86400, we get a decimal Unix day, for example, if UNIX SECOND = 1688897360, then UNIX DAY = 19547.42315, and displaying this number with time formatting, makes it extremely easy for our time-trained eyes to interpret: 19,547 4:23:15, meaning:

   19th Unix decimal year (19 thousand days)
   547th day of the year (5-dmonth, 4-dweek, 7-dweekday)
   4:23:15 decimal time (4-dhour, 23-dminute, 15-dsecond)

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