Shell Programming and Scripting

Hi

I need to write a shell script (bash) that takes a date as an
in-parameter an decides if its winter or summer time.

I have diffrent dates like 20150112 , 200901028 , 200100605 etc.

The rule for winter/summer time is :
Summer time spans between the last Sunday in march 02:00 to the last Sunday in October 03:00

I dont have access to the calender function, the only thing I can play with is date.

Any help/ideas would be appreciated

Im using Cygwin on the Windows Platform

Cheers

Hi,
I will surely be dead by then! :=)

Assuming you have GNU date on your linux emulator, you can try this:

Code:

jeanluc@ibm:~/scripts/test$ cat dst.sh 
#!/bin/bash
LANG=C
while read i;do
    dte=$(date -d"$i" +%s)
    dte_dst=$(TZ=DST date -d"$i" +%s)
    if (($(($dte_dst-$dte)) == 7200));then
        echo $i "Summer Time"
    else
        echo $i "Winter Time"
    fi
done < $1

Code:

jeanluc@ibm:~/scripts/test$ cat file
20150112
20090225
20090725
20091230

jeanluc@ibm:~/scripts/test$ ./dst.sh file
20150112 Winter Time
20090225 Winter Time
20090725 Summer Time
20091230 Winter Time

200100605

Brilliant Solution, Thank Very Much