How to obtain the Julian date, Day of Year and Day of Week

Keywords: day of week TimeDayofWeek 

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Question:

In my latest version of WinBatch (ver 96m, DLL 2.3mbn) a request for a julian date returns a 6 character numeric. But running the same routine from older versions (ver 95d, Wil Interpreter 2.2abm) , using 'run WIL file', returns a 5 character numeric. Is this my imagination or is there an explanation for this difference?

Answer:

This was a change put in for year 2000 compliance.

There are a lot of different definitions of exactly what is a julian date.

Definition: A Julian representation is simply a count of days since some fixed day in the past.

Originally, I think we started counting from Jan 1 1900, but with the change we started from Jan 1 0000, adding about 730000 days to the number.

You can extract the current day of the week using the following script:

;This example grabs the Time/Day of the Week.
a=TimeYmdHms()
b=TimeJulianDay(a) 
c=(b+5) mod 7
day=ItemExtract(c+1, "Sun Mon Tue Wed Thu Fri Sat", " ")
line=StrCat("Julian Date-> ", b,@CRLF,"Day of week-> ",day)
Message(TimeDate(), line)

If you want to determine what day of the week a specific date is, you would substitute the exact date for the "a" variable, as in:

;This example grabs the Time/Day of the Week.
a="96:04:12:15:24:00"	; where this is the date for which you want the day of week
b=TimeJulianDay(a) 
c=(b+5) mod 7
day=ItemExtract(c+1, "Sun Mon Tue Wed Thu Fri Sat", " ")
line=StrCat("Julian Date-> ", b,@CRLF,"Day of week-> ",day)
Message(TimeDate(), line)

This example show how to get day Julian date, Day of Year and Day of Week:

ToDate=TimeYmdHms()
ThisYear=ItemExtract(1,ToDate,":")
JanFirst="%thisyear%:01:01:00:00:00"
JanFirstJulian=TimeJulianDay(JanFirst)
ToJulian=TimeJulianDay(ToDate) 
dayofyear=ToJulian-JanFirstJulian+1
dayofweekcode=(ToJulian+5) mod 7
day=ItemExtract(dayofweekcode+1, "Sun Mon Tue Wed Thu Fri Sat", " ")
line=StrCat("Julian Date-> ", ToJulian,@CRLF,"Day of Year->",DayofYear,@CRLF,"Day of week-> ",day)
Message(TimeDate(), line)

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Article ID:   W13876

Filename:   Obtain the Julian day of year and week.txt