CometDates

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Comet Dates

-- Note this applies to comet 32 only.

CometDates are integers specifying the number of days before or after January 1, 1800. Positive numbers are after that date and negative numbers are before that date. To illustrate, the CometDate of -1 represents the date December 31,1799, and the CometDate of 1 represents January 2,1800.

The practical range of CometDates are -657071 (01/01/0001) to 2994987 (12/31/9999). CometDates outside of that range may give strange results.

There are several ways to make a CometDate.

• The Date2Num Function
• The DateToNum Function
• Or preferably, the CometDate Function

• Date Arithmetic -- Since CometDates are numbers, all arithmetic operators will work on them. Keep in mind that all of the conversion routines below will use just the integer portion of the CometDate presented. Make sure that any variable that can contain a CometDate has at least 7 digits as its integer part since CometDates can be that long.

• Conversion Functions
  • Date2Num -- Converts a date string to a CometDate.
  • DateToNum -- Converts a date string to a CometDate.
  • CometDate -- Converts month, day, year numbers into a CometDate.
  • Num2Date -- Represents a CometDate in various ways.
  • NumToDate -- Represents a CometDate in various ways.
  • Year -- Returns the year from a CometDate.
  • Month -- Returns the Month from a CometDate in the form "January", "February", etc.
  • Day -- Returns the Day of the week from a CometDate in the form "Monday", "Tuesday", etc.
  • DayOfYear -- Returns the Day of the year as an integer.
  • DayOfWeek -- Returns the Day of the week as an integer from 1 to 7, where Sunday = 1, Monday = 2 etc.
  • DayOfWorkWeek -- Returns the Day of the week as an integer from 1 to 7, where Monday = 1, Tuesday = 2 etc.
  • IsLeapYear -- Returns TRUE or FALSE depending on whether the CometDate falls within a Leap Year.