Umstellung Auf h:mm in verwaltung

public/js/format-hours.js

@@ -15,5 +15,65 @@
     var prefix = sign < 0 ? '-' : '';
     return prefix + h + 'h ' + min + 'min';
   }
+
+  /** Dezimalstunden in h:mm (z. B. 1.5 -> "1:30", -0.75 -> "-0:45") */
+  function decimalHoursToHhMm(decimalHours) {
+    if (decimalHours == null || !Number.isFinite(Number(decimalHours))) return '0:00';
+    var n = Number(decimalHours);
+    var sign = n < 0 ? -1 : 1;
+    var absVal = Math.abs(n);
+    var h = Math.floor(absVal);
+    var min = Math.round((absVal - h) * 60);
+    if (min >= 60) {
+      h += 1;
+      min = 0;
+    }
+    var prefix = sign < 0 ? '-' : '';
+    return prefix + h + ':' + String(min).padStart(2, '0');
+  }
+
+  /**
+   * Parst h:mm oder Xh Ymin zu Dezimalstunden.
+   * Beispiele: "1:30" -> 1.5, "-0:45" -> -0.75, "1h 30min" -> 1.5.
+   * @returns {number|null} Dezimalstunden oder null bei ungültiger Eingabe
+   */
+  function parseHoursMin(str) {
+    if (str == null) return null;
+    var s = String(str).trim();
+    if (s === '') return 0;
+    var sign = 1;
+    if (s.charAt(0) === '-') {
+      sign = -1;
+      s = s.slice(1).trim();
+    } else if (s.charAt(0) === '+') {
+      s = s.slice(1).trim();
+    }
+    // h:mm oder h:mm:ss
+    var colonMatch = s.match(/^(\d+):(\d{1,2})(?::(\d{1,2}))?$/);
+    if (colonMatch) {
+      var hours = parseInt(colonMatch[1], 10);
+      var minutes = parseInt(colonMatch[2], 10);
+      if (minutes >= 60) return null;
+      var sec = colonMatch[3] != null ? parseInt(colonMatch[3], 10) : 0;
+      if (sec >= 60) return null;
+      var decimal = hours + minutes / 60 + sec / 3600;
+      return sign * decimal;
+    }
+    // Xh Ymin (optional Leerzeichen)
+    var hmMatch = s.match(/^(\d+)\s*h\s*(\d{1,2})?\s*min$/i);
+    if (hmMatch) {
+      var h = parseInt(hmMatch[1], 10);
+      var m = (hmMatch[2] != null) ? parseInt(hmMatch[2], 10) : 0;
+      if (m >= 60) return null;
+      return sign * (h + m / 60);
+    }
+    // Nur Zahl (Dezimalstunden) zulassen als Fallback
+    var num = parseFloat(s.replace(',', '.'));
+    if (!Number.isFinite(num)) return null;
+    return sign * num;
+  }
+
   window.formatHoursMin = formatHoursMin;
+  window.decimalHoursToHhMm = decimalHoursToHhMm;
+  window.parseHoursMin = parseHoursMin;
 })();