_____________________________________________ From: Palmen, KEV (Karl) Sent: 25 September 1998 13:45 To: 'East Carolina University Calendar discussion List' Subject: 24-30 Hour Clock for Flexible Date Start
Dear Calendar People
When I got back to Reading just after midnight of my way back from Holiday, I looked at the timetable and at first I could see trains after midnight!
But then I did by looking at the top of the timetable. Isn't midnight sometimes an awkward time to start a date!
It would be convenient to have a later date start (e.g. 03:00 = 3am). So I came up with a generalisation of the 24 hour clock that allows one to delay the date start without interfering with daytime
of evening clock times.
The date can begin anytime between 00:00 and 06:00, preferably on an hour. No matter when a date begins, hours are counted from the midnight on or before the date start. For example if you start
your date at 04:00, the hours are from 04 to 27 inclusive. 02:00 would be 26:00.
For dates beginning on whole hours, hours are counted as shown below:
Date Start Hours
00:00 00 - 23
01:00 01 - 24
02:00 02 - 25
03:00 03 - 26
04:00 04 - 27
05:00 05 - 28
06:00 06 - 29
It is not necessary to communicate the date start to just give such a time. For example 25:45 Friday is always equivalent to 01:45 Saturday.
The scheme can be adapted to a 12 hour clock. New initials would be needed for times between midnight and the end of the date.
It can also be modified for use by calendars whose date begins at sunrise or sunset. For dates beginning on sunset hours could be counted from the previous noon. If sunset were 5:44 p.m.
hours would then run from 05:44 to about 17:44 . If the days were lengthening there would be no ambiguity as in the expression "5:44pm this date". It would not matter if the sunset time were a little wrong (29:45 this date = 05:45 next date).