China DOS Union

Originally posted by 26933062 at 2008-6-2 00:43:

Isn't this subtracting exactly 2 months?
First subtract the minutes, hours, and days, the result is: 19:09 on April 1, 2008
Then subtract 2 full months, that is: 4 minus 2, getting 19:09 on February 1, 2008

Please look at my calculation order. If you change the days to 10 days ago, it won't be subtracting exactly 2 months, right?

Headache, not tested in detail

@echo off

set/p times=Enter year month day hour minute

for /f "tokens=1-5 delims= " %%a in ("%times%") do set /a yy=%%a,mm=%%b,tt=%%c,hh=%%d,ss=%%e

  for /f "tokens=1-3 delims=-/\:. " %%i in ("%date%") do set /a p1=%%i,p2=100%%j%%100,p3=100%%k%%100

    for /f "tokens=1-3 delims=:" %%i in ('time/t') do set /a t1=100%%i%%100,t2=100%%j%%100

        set/a s2=ss%%60,t1-=ss/60%%24,t2-=s2,hh+=ss/60

        if %t2% lss 0 set/a t2+=60

        if %t1% lss 0 set/a t1+=24

        set/a h1=hh%%24,tt+=(hh-h1)/24,t1-=h1

        if %t1% lss 0 set/a t1+=24,tt+=1

        set/a p1-=yy

        set/a m2=mm%%12,p1-=(mm+p2)/12,p2-=m2

        if %p2% leq 0 set/a p2+=12

        if %p3% gtr %TT% goto ppp

:nxt

set/a p2-=1

if %p2% equ 0 set/a p1-=1&&set p2=12

     set/a PN2="!(p1%%4) & !(!(p1%%100)) | !(p1%%400)",PN2=28+PN2

     for /f "tokens=%p2%" %%i in ("31 %pN2% 31 30 31 30 31 31 30 31 30 31") do set/a p3=%p3%+%%i

     if %p3% leq %tt% goto nxt

:ppp

     set/a p3=%p3%-%tt%

     setlocal enabledelayedexpansion

     for %%i in (p2 p3 t1 t2) do if !%%i! lss 10 set %%i=0!%%i!

     echo %p1% year %p2% month %p3% day %t1% hour %t2% minute

pause&goto :eof

Having the courage to try is a good thing!!