Linux Windows Timer modifies system time

#/bin/bash#befortime=02:00aftertime=08:00befortime=$ (echo  $beforTime  | awk -F :  {' print $1 '}) aftertime=$ (echo  $afterTime  | awk -f : {' print $1 ') Flag=0while truedo     sleep 2s    echo  "date: $ (date +"%y-%m-%d  %h:%m:%s ")"     if [ $ (date +%h)  -eq  $beforTime  ];  then        curdate=$ (date +%d)          changedate=$ (expr  $CurDate  - 1)          date -s  ' $ (date + "%y-%m-$ChangeDate  %h:%m:%s")          if [ $? -eq 0 ]; then             echo  "changed date: $ (date +"%y-%m-$ChangeDate  %h :%m:%s ")"             flag=1             break        fi      fidoneif [  $Flag  -eq 1 ];then    while true     do    sleep 2s    echo  "date: $ (date + "%y-%m-%d %h:%m:%s") "    if [ $ (date +%h)  -eq $ aftertime ]; then        curdate=$ (date +%d)          changedate=$ (expr  $CurDate  + 1)          date -s  ' $ (date + "%y-%m-$ChangeDate  %h:%m:%s")          if [ $? -eq 0 ]; then             echo  "changed date: $ (date +"%y-%m-$ChangeDate  %h:%m:%s ")"              Flag=0             break        fi      fi   donefi

@echo  off@set startdate=05@set changedate=04@set changetime=18:59@set endtime=19:00@ echo  start Task: No. 05, 1 Change Time @set errnum=0:processdate@if %errnum% equ 1  (ping /n  5 127.0.0.1 > nul) @for  /f  "usebackq tokens=1,2,3 delims=-/ "  %%i in  (' date /t ')  do  (  set year=%%i  set mon=%% j  set todaydate=%%k  echo real_date: %%i-%%j-%%k  %todaydate%) @ if %todaydate% neq %startdate%  (  set errnum=1  goto : processdate ):P rocesstime@if %todaydate% equ %startdate%  (   for  /f  "usebackq tokens=1,2 delims=-/ "  %%a in  (' time /t ')  do  (      if  "%%a"  NEQ  "%changetime%"  goto :P rocesstime      if&nBSP; " %%a " == "%changetime% " call :ChangeCurDate   :P rocesstime_2 for / f  "usebackq tokens=1,2 delims=-/ "  %%a in  (' time /t ')  do  (        if  "%%a"  ==  "%endtime%"   (      echo %Year%-%Mon%-%TodayDate%         date  %year%-%mon%-%todaydate%         goto :eof        )  else  (         goto : processtime_2       )      )          ): changecurdateecho change_date: %year%-%mon%-%changedate% @date   %year%-%mon%-%changedate%  @goto  :eof

This article is from "Focus on Oracle Performance Tuning" blog, declined reprint!