11130 » Another way to calculate date plus or minus n days? (27-Dec-06)
I had scripted previous date calculations, some of which are:
8293 » How can I return the date that is plus or minus n days from today?
9977 » How can I calculate the difference between two short dates?
0721 » General purpose date math routine.
I have now scripted PorMdays.bat to return a date in YYYY-MM-DD format that is the result of adding or subtracting
n days from a short date, or from TODAY.
The syntax for using PorMdays.bat is:
[call] PorMdays NewYYYY-MM-DD DATEorTODAY +or-NN
Where:
NewYYYY-MM-DD is a call directed numeric environment variable that will contain the resulting YYYY-MM-DD.
DATEorTODAY is a valid short date, or the literal TODAY.
+or-NN is the number to add or subtract from DATEorTODAY, like 0, or +1, or -1, or +365.
NOTE: Because NewYYYY-MM-DD is a valid short date, it can be used in subsequent calculations, as in the following silly
example:call PorMdays Thisday today 0
call PorMdays Yesday %Thisday% -1
call PorMdays Tomday %Yesday% +2
@echo Today is %Thisday%, Yesterday was %Yesday%, and Tomorrow is %Tomday%
PorMdays.bat contains:
@echo off
if {%4} NEQ {} @echo Syntax: [call] PorMdays NewYYYY-MM-DD DATEorTODAY +or-NN (call PorMdays YMD today -1)&goto :EOF
if {%3} EQU {} @echo Syntax: [call] PorMdays NewYYYY-MM-DD DATEorTODAY +or-NN (call PorMdays YMD today -1)&goto :EOF
setlocal
if /i "%2" EQU "TODAY" (
set DT=now
) else (
set DT="%2"
)
set RND=%RANDOM%
@echo.s=DateAdd("d",%3,%DT%) >"%temp%\%~n0_%RND%.vbs"
@echo.WScript.Echo year(s)^&right(100+month(s),2)^&right(100+day(s),2) >>"%temp%\%~n0_%RND%.vbs"
for /f %%a in ('cscript //nologo "%temp%\%~n0_%RND%.vbs"') do set YYYYMMDD=%%a
del /q "%temp%\%~n0_%RND%.vbs"
set YMD=%YYYYMMDD:~0,4%-%YYYYMMDD:~4,2%-%YYYYMMDD:~6,2%
endlocal&set %1=%YMD%
End of Article
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