a5cc447a-58b7-45b8-a6eb-227a192ca86e 5 9 12 decimal

&[DATE] &[TIME] - &[FILENAME]

Calendar Dates 1/1 MCD

date JDay Y date 104 -^* trunc : M 102 -^date Y 104^* - (* trunc : D date Y 104^* - M 100 * - : M 3 < M M 12 + : Y Y 1 - : 21 line recover JDay(date) if a 153 M * 457 - 5 / trunc 365 Y * + : b Y 4 / Floor Y 100 / Floor - Y 400 / Floor + : JDay a b + D + 1721118.5 + : 71 line :

JDay(date) . . .

calculates the Julian day from the Gregorian Calendar

(the calendar we currently use) espressed in

YYYYMMDD.DD format (the .DD is the decimal

fraction of the day). The Julian day for a date is the

number of days that have elapsed between the date

and January 1,4713 BC. The elapse number of days

between two dates is simply the difference between

their Julian day numbers.

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Mathsoft day
today Smath JDay_0 20010610.5 JDay : JDay_1 20190715 JDay : 21 sys

JDay_0 JDay_1 21 mat 2452071 2458679.5 21 mat

Days laps between JDay[0-1] JDay_1 JDay_0 - 6608.5

Day of week from Calendar Date date DOW i date JDay 1.5 + Floor 7 mod : DOW Sunday : i 0 ≡ DOW Monday : i 1 ≡ DOW Tuesday : i 2 ≡ DOW Wednesday : i 3 ≡ DOW Thursday : i 4 ≡ DOW Friday : i 5 ≡ DOW Saturday : cases 21 line :

Pearl Harbor 19411207 DOW Sunday

Mathsoft day 20010610 DOW Sunday

GP-pops was born 19401009 DOW Wednesday

Normandie D-Day 19440606 DOW Tuesday

converts Julian day to Gregorian Calendar date jdn CDate Z jdn 1721118.5 - Floor : R jdn 1721118.5 - Z - : G Z 0.25 - Floor : A G 36524.25 / Floor : B A A 4 / Floor - : year B G + 365.25 / Floor : C B Z + 365.25 year * Floor - : month 5 C * 456 + 153 / trunc : day C 153 month * 457 - 5 / trunc - R + : month 12 > year year 1 + : month month 12 - : 21 line End conversion if CDate year 104^* month 100 * + day + : 111 line :

2452081.5 Mathsoft Julian day 2452081.5 CDate 20010621

programmers time laps since
1970:01:0:0:0:0:0:0 
result is by default ... ms 1 time 13207707341.695 s *

The Gregorian calendar is the calendar used in most of the world. It is named after Pope Gregory XIII, who introduced it in October 1582. The calendar spaces leap years to make the average year 365.2425 days long, approximating the 365.2422-day tropical year that is determined by the Earth's revolution around the Sun.