C.W.Holeman III

HST Clock


Writing Projects

The Dance in the Deeps
First Draft

A Clockwork Armada
First Draft

Quote of the Week

"You're in America now," I said. "Our idea of diplomacy is showing up with a gun in one hand and a sandwich in the other and asking which you'd prefer."

--Harry Dresden [Turn Coat, by Jim Butcher]

Joke of the Week

There are only 10 kinds of people in the world: Those who know binary, and those who don't.

Twitter Updates

Holeman Simplified Calendar: Earth

A less radical redesign of the calendar than the interplanetary calendar (HSK), the "Holeman Simplified Calendar: Earth" (HSKE) is a slightly modified form of the International Fixed Calendar. The purpose of HSKE is to simplify time keeping. IFC was found to be inconvenient due to months after June (the 6th month) having different month numbers compared to the Gregorian Calendar, and the placement of the leap day in IFC further complicated issues. The primary differences between the IFC & HSKE are the location & names of days and months. Each year coincides with the corresponding Gregorian year, so the first of January in the HSKE always falls on the first day of January in the Gregorian calendar.

In HSKE there are 13 months of 28 days apiece. Each month in HSKE has 4 weeks of 7 days. All weeks start on Monday and end on Sunday. Additionally, the last day of the year is a month-less, day-of-the-week-less day called New Year's Eve. The 13th month is called Shirsan, which is derived from the Chinese word "thirteen" (十三, "Shísān").

Leap years add an additional, 366th day called simply Leap Day. Like Year's End Day, Leap Day is month-less & day-of-the-week-less. This day falls, when needed, directly after Year's End Day. The leap day schedule follows the Gregorian method: there is a leap year in every year whose number is divisible by 4, but not if the year number is divisible by 100, unless it is also divisible by 400.

One objection raised to a 13 month calendar is the complication of dividing the year into quarters, and halves. In the Gregorian calendar this is typically done by taking 3 or 6 months. However, this actually leads to each quarter or half year to be a different length as each month has differing lengths. In HSKE, each quarter is exactly 3 months and 1 week (13 weeks). Each half a year is exactly 6 months and two weeks (26 weeks).

Every month:

List of months. Start & End are in relation to the Gregorian calendar.
1JanuaryJan.Jan. 1Jan. 28
2FebruaryFeb.Jan. 29Feb. 25
3MarchMar.Feb. 26Mar. 25*
4AprilApr.Mar. 26Apr. 22
5MayMayApr. 23May 20
6JuneJuneMay 21Jun. 17
7JulyJulyJun. 18Jul. 15
8AugustAug.July 16Aug. 12
9SeptemberSept.Aug. 13Sept. 9
10OctoberOct.Sept. 10Oct. 7
11NovemberNov.Oct. 8Nov. 4
12DecemberDec.Nov. 5Dec. 2
13ShirsanShir.Dec. 3Dec. 30
New Years's EveDec. 31
Leap Day (When needed)Dec. 32 (Replaces Feb. 29)

*All dates after this are a day off in a leap year, which is yet another reason to use the HSKE.

Notable Holidays.
HolidayHSKE DateGregorian Date
New Year's DayJan. 1Jan. 1
Valentine's Day Feb. 17Feb. 14
Washington's Birthday Feb. 23Feb. 20
Pi DayMar. 14Mar. 14
Saint Patrick's DayMar. 20Mar. 17
First day of SpringMar. 24Mar. 21
EasterMar. 28The first Sunday after the first Full Moon occurring on or after the March equinox.
Memorial DayMay 22The last Monday in May
First day of SummerJuly 4June 21
Independence DayJuly 17July 4
Labor DaySept. 1The first Monday in September.
Columbus DayOct. 12Oct. 12, actual. Second Monday in October, traditional.
First day of Autumn / FallOct. 1221 Sept.
HalloweenNov. 24Oct. 31
Veterans DayDec. 7Nov. 11
ThanksgivingDec. 25The fourth Thursday in November.
First day of WinterShir. 19Dec. 21 or Dec. 22
Christmas EveShir. 22Dec. 24
ChristmasShir 23Dec. 25
New Year's Eve-Dec. 31


Convert Gregorian dates to HSKE dates.

Leap year?