line 58: -ne: command not found
line 58: [: missing `]'

cat file
2013-03-31 09 23
2013-03-31 09 23
#2013-03-31 09 32

./myscript file

#!/bin/sh
#########################################################################
DATE=$1
HOUR=$2
MN=$3
function g1 () {
  EC=0
  case "$1" in

    ([1-9][0-9][0-9][0-9]-0[1-9]-0[1-9] | [1-9][0-9][0-9][0-9]-0[1-9]-1[0-9] | [1-9][0-9][0-9][0-9]-0[1-9]-2[0-9] | [1-9][0-9][0-9][0-9]-0[1-9]-3[0-1] | [1-9][0-9][0-9][0-9]-1[0-2]-0[1-9] | [1-9][0-9][0-9][0-9]-1[0-2]-1[0-9] | [1-9][0-9][0-9][0-9]-1[0-2]-2[0-9] | [1-9][0-9][0-9][0-9]-1[0-2]-3[0-1])
# nothing, OK !
    ;;
    (*)
      echo 'Fatal, $1 = '"'$1'"', Date not conform OR absent' >&2
      EC=1
    ;;
  esac

   case "$2" in
     ([01][0-9] | 2[0-3])
        # nothing, OK !
    ;;
    (*)
      echo 'Fatal, $2 = '"'$2'"', Hour in 2 digits between 00 and 23' >&2
      EC=1
    ;;
   esac

   case "$3" in

    ([01][0-9] | [2-5][0-9])
      # nothing, OK !
     ;;
    (*)
      echo 'Fatal, $3 = '"'$3'"', Minute in two digits between 00 and 59' >&2
      EC=1
    ;;
   esac
   [ "$EC" = 1 ]
}

f1() {
echo -e "$DATE $HOUR $MIN"
}

case $# in
        0)      echo -e "# comment1\n# comment2" > list_file
                read -p "Please fill in this list_file: "

                echo $REPLY
                ;;
        1)     if [ ! -f "$1" ]
               then  > $1 && echo -e "# comment1\n# comment1" > $1
                        read -p "Please fill in "$1": "

                        echo $REPLY
               else
                        if [ -f "$1" -a $(grep -v '^#' "$1" | wc -l ) -ne 0 | $(g1 $arg1 $arg2 $arg3) -ne 0 ] # line 58
                        then
                                grep -v '^#' "$1" |
                                                while read arg1 arg2 arg3
                                                do f1 $arg1 $arg2 $arg3
                                                done
                         else
                                        echo "Errors found in date/time - exiting now" >&2
                                        exit 1
                          fi
                                read -p "Please fill in "$1": "
                                echo $REPLY
                fi
               ;;

        3)      echo -e "# Fill in the 3 variables below\n# DATE HOUR MN" > $1
                echo $2 $3 $4 >> "$1"                  # concatenation of variables in $ 1
                                grep -v '^#' "$1" | # Omits the comments
                                while read arg1 arg2 arg3 # Parse the parameters
                                do f1 $arg1 $arg2 $arg3 # Processing parameters for the function f1
                                done
                ;;
 *)      echo "error msg"; exit
esac