#!/bin/bash

Help(){
    echo "Hello. This is script for show last N time in log"
}


Solution() {
start_time=$(date -d "$time" "+%Y-%m-%d %H:%M:%S")
stop_time=$(date -d "$time $offset second" "+%Y-%m-%d %H:%M:%S")

while read -r UserDate; do

    var=$(echo "$UserDate" | awk -F'|' '{print $2}' | sed -r 's/^\s+//g')
    time=$(date -d "$var" "+%Y-%m-%d %H:%M:%S")
    if [[ $time < $stop_time ]] || [[ $time == $stop_time ]] && [[ $time > $start_time ]] || [[ $time == "$start_time" ]]; then
        echo "$UserDate"
    fi

    if [[ $time > $stop_time ]]; then
        exit
    fi


done <"$path"

}

if [ "$*" = "" ]; then
    echo "Please enter parametres"
    exit
fi

if [ "$1" == "" ] || [ "$2" == "" ] || [ "$3" == "" ]; then
    echo "no one or more parametr. Watch help"
    Help
    exit
fi


if [[ $1 = "--help" || $1 = "-h" ]]; then
    Help
    exit

fi

if [ -f "$1" ]; then
    path=$1
else
    echo File not found
    exit
fi

time=$2
offset=$3
Solution
exit