Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday

Units of time

The basic unit of time is the day. Times can be expressed as fractional days in decimal form to any desired precision.

Days			Hours	Minutes	Seconds	Milliseconds
1	1 day	1 d	24	1440	86 400	86 400 000
0.1	1 deciday	1 dd	2.4	144	8 640	8 640 000
0.01	1 centiday	1 cd	0.24	14.4	864	864 000
0.001	1 milliday	1 md	0.024	1.44	86.4	86 400
0.0001	100 microdays	100 μd	0.0024	0.144	8.64	8 640
0.00001	10 microdays	10 μd	0.00024	0.0144	0.864	864
0.000001	1 microday	1 μd	0.000024	0.00144	0.0864	86.4

.0 is midnight. .5 is noon. .333333 is 8:00AM. .666666 is 4:00PM.

Dates

The date is composed of the four digit year and the one, two or three digit day of the year, numbered from zero so that it also measures the time (in days) elapsed since the beginning of the year. Common Gregorian years are used, containing 365 days (366 on leap years). On leap years, the extra day in February causes the entire remainder of the year to be off by one in relation to the Gregorian calendar, compared to a common year. Do I need to fix this?

The standard date format is as follows:

YYYY DDD.TTTTTT Weekday

This format includes the four-digit year, three-digit day of year, six-digit time expressed as fractional days in decimal form, and for convenience, the day of the week. It is ordered from the most significant to least significant part, so that a simple ascending text sort will place earlier dates ahead of later ones.