diff --git a/package-lock.json b/package-lock.json
index 89077d9..2087709 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -33,7 +33,8 @@
         "rimraf": "^3.0.2",
         "rss-parser": "^3.12.0",
         "rxjs": "^7.2.0",
-        "socket.io": "^4.4.1"
+        "socket.io": "^4.4.1",
+        "working-time-calculator": "^0.0.2"
       },
       "devDependencies": {
         "@nestjs/cli": "^8.0.0",
@@ -7615,6 +7616,25 @@
         "mkdirp": "bin/cmd.js"
       }
     },
+    "node_modules/moment": {
+      "version": "2.30.1",
+      "resolved": "https://registry.npmjs.org/moment/-/moment-2.30.1.tgz",
+      "integrity": "sha512-uEmtNhbDOrWPFS+hdjFCBfy9f2YoyzRpwcl+DqpC6taX21FzsTLQVbMV/W7PzNSX6x/bhC1zA3c2UQ5NzH6how==",
+      "engines": {
+        "node": "*"
+      }
+    },
+    "node_modules/moment-timezone": {
+      "version": "0.5.45",
+      "resolved": "https://registry.npmjs.org/moment-timezone/-/moment-timezone-0.5.45.tgz",
+      "integrity": "sha512-HIWmqA86KcmCAhnMAN0wuDOARV/525R2+lOLotuGFzn4HO+FH+/645z2wx0Dt3iDv6/p61SIvKnDstISainhLQ==",
+      "dependencies": {
+        "moment": "^2.29.4"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/moo": {
       "version": "0.5.2",
       "resolved": "https://registry.npmjs.org/moo/-/moo-0.5.2.tgz",
@@ -7756,6 +7776,17 @@
         "webidl-conversions": "^3.0.0"
       }
     },
+    "node_modules/node-ical": {
+      "version": "0.12.9",
+      "resolved": "https://registry.npmjs.org/node-ical/-/node-ical-0.12.9.tgz",
+      "integrity": "sha512-5nUEZfZPpBpeZbmYCCmNRLsoP08+SGZy/fKxNBX9k67JMUTMFPLEyZ0CXApPDIExX0izMRndG1PsymhEkkSL2Q==",
+      "dependencies": {
+        "moment-timezone": "^0.5.31",
+        "request": "^2.88.2",
+        "rrule": "2.6.8",
+        "uuid": "^8.3.1"
+      }
+    },
     "node_modules/node-int64": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/node-int64/-/node-int64-0.4.0.tgz",
@@ -8805,6 +8836,31 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/rrule": {
+      "version": "2.6.8",
+      "resolved": "https://registry.npmjs.org/rrule/-/rrule-2.6.8.tgz",
+      "integrity": "sha512-cUaXuUPrz9d1wdyzHsBfT1hptKlGgABeCINFXFvulEPqh9Np9BnF3C3lrv9uO54IIr8VDb58tsSF3LhsW+4VRw==",
+      "dependencies": {
+        "tslib": "^1.10.0"
+      },
+      "optionalDependencies": {
+        "luxon": "^1.21.3"
+      }
+    },
+    "node_modules/rrule/node_modules/luxon": {
+      "version": "1.28.1",
+      "resolved": "https://registry.npmjs.org/luxon/-/luxon-1.28.1.tgz",
+      "integrity": "sha512-gYHAa180mKrNIUJCbwpmD0aTu9kV0dREDrwNnuyFAsO1Wt0EVYSZelPnJlbj9HplzXX/YWXHFTL45kvZ53M0pw==",
+      "optional": true,
+      "engines": {
+        "node": "*"
+      }
+    },
+    "node_modules/rrule/node_modules/tslib": {
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
+      "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg=="
+    },
     "node_modules/rss-parser": {
       "version": "3.13.0",
       "resolved": "https://registry.npmjs.org/rss-parser/-/rss-parser-3.13.0.tgz",
@@ -10657,6 +10713,23 @@
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
       "integrity": "sha512-gvVzJFlPycKc5dZN4yPkP8w7Dc37BtP1yczEneOb4uq34pXZcvrtRTmWV8W+Ume+XCxKgbjM+nevkyFPMybd4Q=="
     },
+    "node_modules/working-time-calculator": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/working-time-calculator/-/working-time-calculator-0.0.2.tgz",
+      "integrity": "sha512-HhHRna3MIQlKirGGNfALVl567hfza4qBoo0KwRO7D5WZzeREFBT9hgUHVVOCHA0znJnc5VmWbtMagnG41TWVCA==",
+      "dependencies": {
+        "luxon": "^1.25.0",
+        "node-ical": "^0.12.1"
+      }
+    },
+    "node_modules/working-time-calculator/node_modules/luxon": {
+      "version": "1.28.1",
+      "resolved": "https://registry.npmjs.org/luxon/-/luxon-1.28.1.tgz",
+      "integrity": "sha512-gYHAa180mKrNIUJCbwpmD0aTu9kV0dREDrwNnuyFAsO1Wt0EVYSZelPnJlbj9HplzXX/YWXHFTL45kvZ53M0pw==",
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/wrap-ansi": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
@@ -16562,6 +16635,19 @@
         "minimist": "^1.2.6"
       }
     },
+    "moment": {
+      "version": "2.30.1",
+      "resolved": "https://registry.npmjs.org/moment/-/moment-2.30.1.tgz",
+      "integrity": "sha512-uEmtNhbDOrWPFS+hdjFCBfy9f2YoyzRpwcl+DqpC6taX21FzsTLQVbMV/W7PzNSX6x/bhC1zA3c2UQ5NzH6how=="
+    },
+    "moment-timezone": {
+      "version": "0.5.45",
+      "resolved": "https://registry.npmjs.org/moment-timezone/-/moment-timezone-0.5.45.tgz",
+      "integrity": "sha512-HIWmqA86KcmCAhnMAN0wuDOARV/525R2+lOLotuGFzn4HO+FH+/645z2wx0Dt3iDv6/p61SIvKnDstISainhLQ==",
+      "requires": {
+        "moment": "^2.29.4"
+      }
+    },
     "moo": {
       "version": "0.5.2",
       "resolved": "https://registry.npmjs.org/moo/-/moo-0.5.2.tgz",
@@ -16681,6 +16767,17 @@
         }
       }
     },
+    "node-ical": {
+      "version": "0.12.9",
+      "resolved": "https://registry.npmjs.org/node-ical/-/node-ical-0.12.9.tgz",
+      "integrity": "sha512-5nUEZfZPpBpeZbmYCCmNRLsoP08+SGZy/fKxNBX9k67JMUTMFPLEyZ0CXApPDIExX0izMRndG1PsymhEkkSL2Q==",
+      "requires": {
+        "moment-timezone": "^0.5.31",
+        "request": "^2.88.2",
+        "rrule": "2.6.8",
+        "uuid": "^8.3.1"
+      }
+    },
     "node-int64": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/node-int64/-/node-int64-0.4.0.tgz",
@@ -17462,6 +17559,28 @@
         "glob": "^7.1.3"
       }
     },
+    "rrule": {
+      "version": "2.6.8",
+      "resolved": "https://registry.npmjs.org/rrule/-/rrule-2.6.8.tgz",
+      "integrity": "sha512-cUaXuUPrz9d1wdyzHsBfT1hptKlGgABeCINFXFvulEPqh9Np9BnF3C3lrv9uO54IIr8VDb58tsSF3LhsW+4VRw==",
+      "requires": {
+        "luxon": "^1.21.3",
+        "tslib": "^1.10.0"
+      },
+      "dependencies": {
+        "luxon": {
+          "version": "1.28.1",
+          "resolved": "https://registry.npmjs.org/luxon/-/luxon-1.28.1.tgz",
+          "integrity": "sha512-gYHAa180mKrNIUJCbwpmD0aTu9kV0dREDrwNnuyFAsO1Wt0EVYSZelPnJlbj9HplzXX/YWXHFTL45kvZ53M0pw==",
+          "optional": true
+        },
+        "tslib": {
+          "version": "1.14.1",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
+          "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg=="
+        }
+      }
+    },
     "rss-parser": {
       "version": "3.13.0",
       "resolved": "https://registry.npmjs.org/rss-parser/-/rss-parser-3.13.0.tgz",
@@ -18879,6 +18998,22 @@
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
       "integrity": "sha512-gvVzJFlPycKc5dZN4yPkP8w7Dc37BtP1yczEneOb4uq34pXZcvrtRTmWV8W+Ume+XCxKgbjM+nevkyFPMybd4Q=="
     },
+    "working-time-calculator": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/working-time-calculator/-/working-time-calculator-0.0.2.tgz",
+      "integrity": "sha512-HhHRna3MIQlKirGGNfALVl567hfza4qBoo0KwRO7D5WZzeREFBT9hgUHVVOCHA0znJnc5VmWbtMagnG41TWVCA==",
+      "requires": {
+        "luxon": "^1.25.0",
+        "node-ical": "^0.12.1"
+      },
+      "dependencies": {
+        "luxon": {
+          "version": "1.28.1",
+          "resolved": "https://registry.npmjs.org/luxon/-/luxon-1.28.1.tgz",
+          "integrity": "sha512-gYHAa180mKrNIUJCbwpmD0aTu9kV0dREDrwNnuyFAsO1Wt0EVYSZelPnJlbj9HplzXX/YWXHFTL45kvZ53M0pw=="
+        }
+      }
+    },
     "wrap-ansi": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
diff --git a/package.json b/package.json
index e3eab36..2a39e82 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,8 @@
     "rimraf": "^3.0.2",
     "rss-parser": "^3.12.0",
     "rxjs": "^7.2.0",
-    "socket.io": "^4.4.1"
+    "socket.io": "^4.4.1",
+    "working-time-calculator": "^0.0.2"
   },
   "devDependencies": {
     "@nestjs/cli": "^8.0.0",