CometDate
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| - | ''' | + | '''CometDate Function''' |
'''Syntax:''' CometDate(Month, Day, Year) | '''Syntax:''' CometDate(Month, Day, Year) | ||
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The CometDate function respects the rules for leap years (i.e., the years 1800 and 1900 were not leap years, but the year 2000 is a leap year). | The CometDate function respects the rules for leap years (i.e., the years 1800 and 1900 were not leap years, but the year 2000 is a leap year). | ||
| - | The numeric arguments, Month, Day and Year are not checked for validity. Physical errors will not result from insane day-month combinations like the 87th day of the 45th month, but the results will obviously not make much sense. | + | The numeric arguments, Month, Day and Year are '''not''' checked for validity. Physical errors will not result from insane day-month combinations like the 87th day of the 45th month, but the results will obviously not make much sense. You must include all digits of the year, i.e. if you want 2013 you must indicate 2013, not just 13. |
| - | + | The practical range of CometDates is -657071 (01/01/01) to 2994623 (12/31/9999) but dates outside of that range may be usable in some contexts. There is no year 0 AD, The date goes from 1BC to 1AD. | |
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| + | *'''Date Arithmetic''' -- Since CometDates are numbers, all arithmetic operators will work on them. Keep in mind that all conversion routines will use just the integer portion of the CometDate presented. | ||
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| + | For a reference of all of the functions associated with CometDates see this page [[CometDates]]. | ||
Latest revision as of 23:13, 14 February 2013
CometDate Function
Syntax: CometDate(Month, Day, Year)
Discussion: The CometDate function converts three numeric arguments into a CometDate Date Serial Number. CometDates are based on a date of January 1, 1800. CometDates before that date are negative and after are positive.
The CometDate function respects the rules for leap years (i.e., the years 1800 and 1900 were not leap years, but the year 2000 is a leap year).
The numeric arguments, Month, Day and Year are not checked for validity. Physical errors will not result from insane day-month combinations like the 87th day of the 45th month, but the results will obviously not make much sense. You must include all digits of the year, i.e. if you want 2013 you must indicate 2013, not just 13.
The practical range of CometDates is -657071 (01/01/01) to 2994623 (12/31/9999) but dates outside of that range may be usable in some contexts. There is no year 0 AD, The date goes from 1BC to 1AD.
- Date Arithmetic -- Since CometDates are numbers, all arithmetic operators will work on them. Keep in mind that all conversion routines will use just the integer portion of the CometDate presented.
For a reference of all of the functions associated with CometDates see this page CometDates.
