title: This code crashes for input 08 and 09
body: <p>When I try to run the below code and give start time as 08:00 or 09:00 it crashes immediately. Even values like 08:45 ,09:45 etc etc dont work.</p>
  
  <p>Can someone please help me out what is wrong.
  Thanks in advance.</p>
  
  <hr>
  
  <pre><code>@ECHO OFF 
  ECHO Task calculation
  
  
  set /P st=Please enter the CRQ Start time(hh:mm)
  
  
  set calc1=00:30
  set calc2=01:00 
  set calc3=01:00
  set calc4=00:30
  
  
  set task1=st
  
  
  set /A centis=(%st:~0,2%)*3600+(%st:~3,2%)*60
  if %centis% GTR 86400 set centis=0
  set /A c1=(%calc1:~0,2%)*3600+(%calc1:~3,2%)*60
  set /A c2=(%calc2:~0,2%)*3600+(%calc2:~3,2%)*60
  set /A c3=(%calc3:~0,2%)*3600+(%calc3:~3,2%)*60
  set /A c4=(%calc4:~0,2%)*3600+(%calc4:~3,2%)*60
  
  
  set /a t1=centis+c1
  if %t1% GTR 86400 set t1=0
  set /a t1h=t1/3600
  set /a t1m=(t1-(t1h*3600))/60
  
  
  set /a t2=t1+c2
  if %t2% GTR 86400 set t2=0
  set /a t2h=t2/3600
  set /a t2m=(t2-(t2h*3600))/60
  
  
  set /a t3=t2+c3
  if %t3% GTR 86400 set t3=0
  set /a t3h=t3/3600
  set /a t3m=(t3-(t3h*3600))/60
  
  
  set /a t4=t3+c4
  if %t4% GTR 86400 set t4=0
  set /a t4h=t4/3600
  set /a t4m=(t4-(t4h*3600))/60
  
  
  
  
  echo TASK1 StartTime :%st%
  echo Task1 EndTime :%t1h%:%t1m%
  
  
  echo Task2 StartTime :%t1h%:%t1m%
  echo Task2 EndTime :%t2h%:%t2m%
  
  
  echo Task3 StartTime :%t2h%:%t2m%
  echo Task3 EndTime :%t3h%:%t3m%
  
  
  echo Task4 StartTime :%t3h%:%t3m%
  echo Task4 EndTime :%t4h%:%t4m%
  
  
  echo CRQ EndTime :%t4h%:%t4m%
  
  
  pause&gt;null
  </code></pre>