diff --git a/SnowflakeTraffic.sh b/SnowflakeTraffic.sh
index a1b1cbd..0cc93e4 100644
--- a/SnowflakeTraffic.sh
+++ b/SnowflakeTraffic.sh
@@ -1,38 +1,98 @@
-#!/bin/bash
+#!/usr/bin/env bash
+set -euo pipefail
 
-docker logs snowflake-proxy 2>&1 | awk '
+# Standardwerte für die Parameter (leer = kein Filter)
+START_DATE="${1:-}"
+END_DATE="${2:-}"
+
+# Validierung der Datumseingaben
+validate_date() {
+    local date="$1"
+    [[ -z "$date" ]] && return 0
+    if [[ ! "$date" =~ ^[0-9]{4}-[0-9]{2}-[0-9]{2}$ ]]; then
+        echo "Fehler: Ungültiges Datumsformat für '$date' (erwartet: YYYY-MM-DD)" >&2
+        exit 1
+    fi
+}
+
+validate_date "$START_DATE"
+validate_date "$END_DATE"
+
+docker logs snowflake-proxy 2>&1 | awk -v start_date="$START_DATE" -v end_date="$END_DATE" '
 function human_readable(kb,    units, size, i) {
     split("KB MB GB TB PB", units)
     size = kb
-    for (i = 1; size >= 1024 && i < 5; i++) {
+    for (i = 1; size >= 1024 && i <= length(units); i++) {
         size = size / 1024
     }
     return sprintf("%.2f %s", size, units[i])
 }
 
-{
-    # Datumserkennung und Formatierung
-    if (split($1, date_part, "/") == 3) {
-        current_date = $1
-        gsub(/\//, "-", current_date)  # Ersetze / durch -
-        if (!first_date) first_date = current_date
-        last_date = current_date
+function date_to_epoch(date_str,    parts) {
+    if (split(date_str, parts, /[-\/]/) != 3) return -1
+    if (parts[1] < 1970 || parts[2] < 1 || parts[2] > 12 || parts[3] < 1 || parts[3] > 31) return -1
+    return mktime(parts[1] " " parts[2] " " parts[3] " 00 00 00")
+}
+
+BEGIN {
+    if (start_date != "" && date_to_epoch(start_date) == -1) {
+        print "Ungültiges Startdatum Format" > "/dev/stderr"
+        exit 1
+    }
+    if (end_date != "" && date_to_epoch(end_date) == -1) {
+        print "Ungültiges Enddatum Format" > "/dev/stderr"
+        exit 1
     }
 }
 
-/Traffic Relayed ↓ [0-9]+ KB .*↑ [0-9]+ KB/ {
-    for (i = 1; i <= NF; i++) {
-        if ($i == "↓") { down += $(i+1) }
-        if ($i == "↑") { up += $(i+1) }
+{
+    include_line = 0  # Zurücksetzen bei jeder neuen Zeile
+    
+    # Datumserkennung und Formatierung
+    if (match($0, /([0-9]{4}[-\/][0-9]{2}[-\/][0-9]{2})/, date_match)) {
+        current_date = date_match[1]
+        gsub(/[\/]/, "-", current_date)  # Standardisiert auf YYYY-MM-DD
+        
+        if (!first_date) first_date = current_date
+        last_date = current_date
+        
+        current_epoch = date_to_epoch(current_date)
+        if (current_epoch == -1) next  # Ungültiges Datum überspringen
+        
+        include_line = 1
+        
+        if (start_date != "") {
+            start_epoch = date_to_epoch(start_date)
+            if (current_epoch < start_epoch) include_line = 0
+        }
+        
+        if (end_date != "" && include_line) {
+            end_epoch = date_to_epoch(end_date)
+            if (current_epoch > end_epoch) include_line = 0
+        }
+    }
+}
+
+include_line && /Traffic Relayed ↓ [0-9]+ KB .*↑ [0-9]+ KB/ {
+    # Sicherere Extraktion der Werte mit regulären Ausdrücken
+    if (match($0, /↓ ([0-9]+) KB.*↑ ([0-9]+) KB/, traffic)) {
+        down += traffic[1]
+        up += traffic[2]
     }
 }
 
 END {
     printf "Statistik-Zeitraum:\n"
     printf "Erster Eintrag:  %s\n", first_date
-    printf "Letzter Eintrag: %s\n\n", last_date
+    printf "Letzter Eintrag: %s\n", last_date
     
-    printf "Gesamte Datenmengen:\n"
+    if (start_date != "" || end_date != "") {
+        printf "Gefilterter Bereich: %s bis %s\n\n", 
+            (start_date != "" ? start_date : "Anfang"), 
+            (end_date != "" ? end_date : "Ende")
+    }
+    
+    printf "\nGesamte Datenmengen:\n"
     printf "Download: %d KB (%s)\n", down, human_readable(down)
     printf "Upload:   %d KB (%s)\n", up, human_readable(up)
 }'
\ No newline at end of file