Sample Script to work with date command output

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Requirement:-

To work on date/time difference calculation along with time conversion to EPOC from Normal and vice versa

Inputs:-

# sh date.sh

Usage: date.sh {ETON|NTOE|COM}

     : for ETON - EPOC/UNIX Format value (i.e.  1448337029  )

     : for NTOE - Normal Format value (i.e.  23 Nov 2015 09:50:29   24 hour clock )

     : for COM - Normal Format two values (i.e.  23 Nov 2015 09:50:29   24 hour clock  )

Outputs:-

# sh date.sh COM

Normal Time values Comparision for difference calculation in Seconds

Normal Format date value1 (i.e.  23 Nov 2015 09:50:29   24 hour clock  ): 23 Nov 2015 09:50:29

Normal Format date value2 (i.e.  23 Nov 2015 09:50:29   24 hour clock  ): 23 Nov 2015 08:50:29

1448293829 is greater than 1448290229 and difference is of 3600 seconds

# sh date.sh NTOE

Normal to Epoc Time Conversion

Normal Format value (i.e.  23 Nov 2015 09:50:29   24 hour clock ):23 Nov 2015 09:50:29

Normal to Epoc Time Conversion

1448293829

# sh date.sh ETON

Epoc to Normal Time Conversion

EPOC/UNIX Format value (i.e.  1448337029  ):1448337029

Mon 23 Nov 2015 09:50:29 PM CST

Mon-Nov-23-21.50.29-CST-2015

Script:-

#!/bin/bash

# To check whether input argument is passed to the script or not

####

epoctonormal ()

{

VALUE=$1

if [ $# -ne 1 ]

then

  echo "Function Usage Example: epoctonormal 1448337029 "

else

  # To convert input argument data of Unix Epoc to Normal Timestamp pattern

  date -d @$VALUE +%c                    # Format with spaces like "Mon 23 Nov 2015 09:50:29 PM CST"

  # To convert input argument data of Unix Epoc to Normal Timestamp pattern without any space (For filename usage)

  date -d @$VALUE +%a-%b-%e-%H.%M.%S-%Z-%Y       # Format with spaces removed like "Mon-Nov-23-21.50.29-CST-2015"

fi

}

####

normaltoepoc ()

{

VALUE=$@

if [ $# -eq 0 ] && [ $# -gt 4 ]

then

  echo "Function Usage Example: normaltoepoc 23 Nov 2015 09:50:29   "

  exit

else

  date -d "$VALUE"  +%s

fi

}

####

comparenormal ()

{

if [ $# -eq 0 ] && [ $# -gt 8 ]

then

  echo "Function Usage Example: comparedate VALUE1 VALUE2"

  exit

fi

VALUE1=`date -d "$1 $2 $3 $4 " +%s`

VALUE2=`date -d "$5 $6 $7 $8 " +%s`

let DIFF=$VALUE1-$VALUE2

DIFF=${DIFF/-/}

if [ $VALUE1 -gt $VALUE2 ]

then

  echo $VALUE1 is greater than $VALUE2 and difference is of $DIFF seconds

elif [ $VALUE1 -eq $VALUE2 ]

then

  echo $VALUE1 is equal to $VALUE2

else

  echo $VALUE1 is smaller than $VALUE2 and difference is of $DIFF seconds

fi

}

####

main ()

{

case "$1" in

  ETON)

        echo "Epoc to Normal Time Conversion"

        echo -n "EPOC/UNIX Format value (i.e.  1448337029  ):"; read VALUE

        epoctonormal $VALUE

        ;;

  NTOE)

        echo "Normal to Epoc Time Conversion"

        echo -n "Normal Format value (i.e.  23 Nov 2015 09:50:29   24 hour clock ):"; read VALUE

        normaltoepoc $VALUE

        ;;

  COM)

        echo "Normal Time values Comparision for difference calculation in Seconds"

        echo -n "Normal Format date value1 (i.e.  23 Nov 2015 09:50:29   24 hour clock  ): "; read VALUE1

        echo -n "Normal Format date value2 (i.e.  23 Nov 2015 09:50:29   24 hour clock  ): "; read VALUE2

        comparenormal  $VALUE1 $VALUE2

        ;;

  *)

        echo "Usage: $0 {ETON|NTOE|COM}"

        echo "     : for ETON - EPOC/UNIX Format value (i.e.  1448337029  )"

        echo "     : for NTOE - Normal Format value (i.e.  23 Nov 2015 09:50:29   24 hour clock )"

        echo "     : for COM - Normal Format two values (i.e.  23 Nov 2015 09:50:29   24 hour clock  )"

esac

}

####

main $1

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