diff --git a/README.md b/README.md
index 97a4ab6..0122869 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ The application production technology stack includes:
 - React Hook Form - form management
 - Zod - schema-based validation
 - Lodash - utility functions
-- DayJS - date utility functions
+- date-fns - date utility functions
 - i18next - internationalization framework
 
 The application development technology stack includes:
diff --git a/package-lock.json b/package-lock.json
index 8684981..0c02770 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -26,7 +26,7 @@
         "@tanstack/react-query-devtools": "5.91.3",
         "axios": "1.13.5",
         "classnames": "2.5.1",
-        "dayjs": "1.11.19",
+        "date-fns": "4.1.0",
         "i18next": "25.8.13",
         "i18next-browser-languagedetector": "8.2.1",
         "lodash": "4.17.23",
@@ -1918,6 +1918,15 @@
         "balanced-match": "^1.0.0"
       }
     },
+    "node_modules/@capacitor/assets/node_modules/chownr": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-2.0.0.tgz",
+      "integrity": "sha512-bIomtDF5KGpdogkLd9VspvFzk9KfpyyGlS8YFVZl7TGPBHL5snIOnxeshwVgPteQ9b4Eydl+pVbIyE1DcvCWgQ==",
+      "license": "ISC",
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/@capacitor/assets/node_modules/glob": {
       "version": "9.3.5",
       "resolved": "https://registry.npmjs.org/glob/-/glob-9.3.5.tgz",
@@ -1944,9 +1953,9 @@
       "license": "ISC"
     },
     "node_modules/@capacitor/assets/node_modules/minimatch": {
-      "version": "8.0.5",
-      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-8.0.5.tgz",
-      "integrity": "sha512-85MramurFFFSes0exAhJjto4tC4MpGWoktMZl+GYYBPwdpITzZmTKDJDrxhzg2bOyXGIPxlWvGl39tCcQBkuKA==",
+      "version": "8.0.7",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-8.0.7.tgz",
+      "integrity": "sha512-V+1uQNdzybxa14e/p00HZnQNNcTjnRJjDxg2V8wtkjFctq4M7hXFws4oekyTP0Jebeq7QYtpFyOeBAjc88zvYg==",
       "license": "ISC",
       "dependencies": {
         "brace-expansion": "^2.0.1"
@@ -1967,6 +1976,31 @@
         "node": ">=8"
       }
     },
+    "node_modules/@capacitor/assets/node_modules/minizlib": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/minizlib/-/minizlib-2.1.2.tgz",
+      "integrity": "sha512-bAxsR8BVfj60DWXHE3u30oHzfl4G7khkSuPW+qvpd7jFRHm7dLxOjUk1EHACJ/hxLY8phGJ0YhYHZo7jil7Qdg==",
+      "license": "MIT",
+      "dependencies": {
+        "minipass": "^3.0.0",
+        "yallist": "^4.0.0"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/@capacitor/assets/node_modules/minizlib/node_modules/minipass": {
+      "version": "3.3.6",
+      "resolved": "https://registry.npmjs.org/minipass/-/minipass-3.3.6.tgz",
+      "integrity": "sha512-DxiNidxSEK+tHG6zOIklvNOwm3hvCrbUrdtzY74U6HKTJxvIDfOUL5W5P2Ghd3DTkhhKPYGqeNUIh5qcM4YBfw==",
+      "license": "ISC",
+      "dependencies": {
+        "yallist": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/@capacitor/assets/node_modules/path-scurry": {
       "version": "1.11.1",
       "resolved": "https://registry.npmjs.org/path-scurry/-/path-scurry-1.11.1.tgz",
@@ -2010,6 +2044,33 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/@capacitor/assets/node_modules/tar": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-6.2.1.tgz",
+      "integrity": "sha512-DZ4yORTwrbTj/7MZYq2w+/ZFdI6OZ/f9SFHR+71gIVUZhOQPHzVCLpvRnPgyaMpfWxxk/4ONva3GQSyNIKRv6A==",
+      "deprecated": "Old versions of tar are not supported, and contain widely publicized security vulnerabilities, which have been fixed in the current version. Please update. Support for old versions may be purchased (at exorbitant rates) by contacting i@izs.me",
+      "license": "ISC",
+      "dependencies": {
+        "chownr": "^2.0.0",
+        "fs-minipass": "^2.0.0",
+        "minipass": "^5.0.0",
+        "minizlib": "^2.1.1",
+        "mkdirp": "^1.0.3",
+        "yallist": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/@capacitor/assets/node_modules/tar/node_modules/minipass": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/minipass/-/minipass-5.0.0.tgz",
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+      "license": "ISC",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/@capacitor/assets/node_modules/xml2js": {
       "version": "0.5.0",
       "resolved": "https://registry.npmjs.org/xml2js/-/xml2js-0.5.0.tgz",
@@ -2032,6 +2093,12 @@
         "node": ">=4.0"
       }
     },
+    "node_modules/@capacitor/assets/node_modules/yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "license": "ISC"
+    },
     "node_modules/@capacitor/cli": {
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@@ -2065,16 +2132,6 @@
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-      "dev": true,
-      "license": "BlueOak-1.0.0",
-      "engines": {
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@@ -2118,19 +2175,6 @@
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-      "resolved": "https://registry.npmjs.org/minizlib/-/minizlib-3.1.0.tgz",
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-      "license": "MIT",
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-      "engines": {
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@@ -2138,23 +2182,6 @@
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-      "resolved": "https://registry.npmjs.org/tar/-/tar-7.5.9.tgz",
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-      "dev": true,
-      "license": "BlueOak-1.0.0",
-      "dependencies": {
-        "@isaacs/fs-minipass": "^4.0.0",
-        "chownr": "^3.0.0",
-        "minipass": "^7.1.2",
-        "minizlib": "^3.1.0",
-        "yallist": "^5.0.0"
-      },
-      "engines": {
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     "node_modules/@capacitor/cli/node_modules/tslib": {
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@@ -2162,16 +2189,6 @@
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-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-5.0.0.tgz",
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-      "dev": true,
-      "license": "BlueOak-1.0.0",
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+      "resolved": "https://registry.npmjs.org/@types/node/-/node-25.3.2.tgz",
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@@ -5122,9 +5139,9 @@
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+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-10.2.4.tgz",
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       "dev": true,
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@@ -5691,9 +5708,9 @@
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@@ -5873,9 +5890,9 @@
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@@ -6314,12 +6331,13 @@
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-      "license": "ISC",
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+      "dev": true,
+      "license": "BlueOak-1.0.0",
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-        "node": ">=10"
+        "node": ">=18"
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@@ -7418,6 +7436,16 @@
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+      "resolved": "https://registry.npmjs.org/date-fns/-/date-fns-4.1.0.tgz",
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+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/kossnocorp"
+      }
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+      "dev": true,
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@@ -9510,6 +9539,12 @@
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@@ -10726,36 +10761,18 @@
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-      "version": "3.3.6",
-      "resolved": "https://registry.npmjs.org/minipass/-/minipass-3.3.6.tgz",
-      "integrity": "sha512-DxiNidxSEK+tHG6zOIklvNOwm3hvCrbUrdtzY74U6HKTJxvIDfOUL5W5P2Ghd3DTkhhKPYGqeNUIh5qcM4YBfw==",
-      "license": "ISC",
-      "dependencies": {
-        "yallist": "^4.0.0"
+        "minipass": "^7.1.2"
       },
       "engines": {
-        "node": ">=8"
+        "node": ">= 18"
       }
     },
-    "node_modules/minizlib/node_modules/yallist": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
-      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
-      "license": "ISC"
-    },
     "node_modules/mkdirp": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-1.0.4.tgz",
@@ -11637,13 +11654,6 @@
         "url": "https://github.com/chalk/ansi-styles?sponsor=1"
       }
     },
-    "node_modules/pretty-format/node_modules/react-is": {
-      "version": "17.0.2",
-      "resolved": "https://registry.npmjs.org/react-is/-/react-is-17.0.2.tgz",
-      "integrity": "sha512-w2GsyukL62IJnlaff/nRegPQR94C/XXamvMWmSHRJ4y7Ts/4ocGRmTHvOs8PSE6pB3dWOrD/nueuU5sduBsQ4w==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/process": {
       "version": "0.11.10",
       "resolved": "https://registry.npmjs.org/process/-/process-0.11.10.tgz",
@@ -11693,6 +11703,12 @@
         "react-is": "^16.13.1"
       }
     },
+    "node_modules/prop-types/node_modules/react-is": {
+      "version": "16.13.1",
+      "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.13.1.tgz",
+      "integrity": "sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ==",
+      "license": "MIT"
+    },
     "node_modules/proxy-from-env": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/proxy-from-env/-/proxy-from-env-1.1.0.tgz",
@@ -11879,9 +11895,10 @@
       }
     },
     "node_modules/react-is": {
-      "version": "16.13.1",
-      "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.13.1.tgz",
-      "integrity": "sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ==",
+      "version": "17.0.2",
+      "resolved": "https://registry.npmjs.org/react-is/-/react-is-17.0.2.tgz",
+      "integrity": "sha512-w2GsyukL62IJnlaff/nRegPQR94C/XXamvMWmSHRJ4y7Ts/4ocGRmTHvOs8PSE6pB3dWOrD/nueuU5sduBsQ4w==",
+      "dev": true,
       "license": "MIT"
     },
     "node_modules/react-refresh": {
@@ -11947,6 +11964,12 @@
         "isarray": "0.0.1"
       }
     },
+    "node_modules/react-router/node_modules/react-is": {
+      "version": "16.13.1",
+      "resolved": "https://registry.npmjs.org/react-is/-/react-is-16.13.1.tgz",
+      "integrity": "sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ==",
+      "license": "MIT"
+    },
     "node_modules/read-pkg": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/read-pkg/-/read-pkg-3.0.0.tgz",
@@ -13415,21 +13438,20 @@
       }
     },
     "node_modules/tar": {
-      "version": "6.2.1",
-      "resolved": "https://registry.npmjs.org/tar/-/tar-6.2.1.tgz",
-      "integrity": "sha512-DZ4yORTwrbTj/7MZYq2w+/ZFdI6OZ/f9SFHR+71gIVUZhOQPHzVCLpvRnPgyaMpfWxxk/4ONva3GQSyNIKRv6A==",
-      "deprecated": "Old versions of tar are not supported, and contain widely publicized security vulnerabilities, which have been fixed in the current version. Please update. Support for old versions may be purchased (at exorbitant rates) by contacting i@izs.me",
-      "license": "ISC",
+      "version": "7.5.9",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-7.5.9.tgz",
+      "integrity": "sha512-BTLcK0xsDh2+PUe9F6c2TlRp4zOOBMTkoQHQIWSIzI0R7KG46uEwq4OPk2W7bZcprBMsuaeFsqwYr7pjh6CuHg==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
       "dependencies": {
-        "chownr": "^2.0.0",
-        "fs-minipass": "^2.0.0",
-        "minipass": "^5.0.0",
-        "minizlib": "^2.1.1",
-        "mkdirp": "^1.0.3",
-        "yallist": "^4.0.0"
+        "@isaacs/fs-minipass": "^4.0.0",
+        "chownr": "^3.0.0",
+        "minipass": "^7.1.2",
+        "minizlib": "^3.1.0",
+        "yallist": "^5.0.0"
       },
       "engines": {
-        "node": ">=10"
+        "node": ">=18"
       }
     },
     "node_modules/tar-fs": {
@@ -13457,21 +13479,16 @@
         "streamx": "^2.15.0"
       }
     },
-    "node_modules/tar/node_modules/minipass": {
+    "node_modules/tar/node_modules/yallist": {
       "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/minipass/-/minipass-5.0.0.tgz",
-      "integrity": "sha512-3FnjYuehv9k6ovOEbyOswadCDPX1piCfhV8ncmYtHOjuPwylVWsghTLo7rabjC3Rx5xD4HDx8Wm1xnMF7S5qFQ==",
-      "license": "ISC",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-5.0.0.tgz",
+      "integrity": "sha512-YgvUTfwqyc7UXVMrB+SImsVYSmTS8X/tSrtdNZMImM+n7+QTriRXyXim0mBrTXNeqzVF0KWGgHPeiyViFFrNDw==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
       "engines": {
-        "node": ">=8"
+        "node": ">=18"
       }
     },
-    "node_modules/tar/node_modules/yallist": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
-      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
-      "license": "ISC"
-    },
     "node_modules/teex": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/teex/-/teex-1.0.1.tgz",
diff --git a/package.json b/package.json
index 569d41d..c1dadfa 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
     "@tanstack/react-query-devtools": "5.91.3",
     "axios": "1.13.5",
     "classnames": "2.5.1",
-    "dayjs": "1.11.19",
+    "date-fns": "4.1.0",
     "i18next": "25.8.13",
     "i18next-browser-languagedetector": "8.2.1",
     "lodash": "4.17.23",
diff --git a/src/common/api/useGetUserTokens.ts b/src/common/api/useGetUserTokens.ts
index 4312545..705cdc0 100644
--- a/src/common/api/useGetUserTokens.ts
+++ b/src/common/api/useGetUserTokens.ts
@@ -1,5 +1,5 @@
 import { useQuery } from '@tanstack/react-query';
-import dayjs from 'dayjs';
+import { isBefore } from 'date-fns';
 
 import { UserTokens } from 'common/models/auth';
 import { QueryKey, StorageKey } from 'common/utils/constants';
@@ -20,8 +20,8 @@ export const useGetUserTokens = () => {
       if (storedTokens) {
         // tokens found
         const tokens = JSON.parse(storedTokens) as unknown as UserTokens;
-        const now = dayjs();
-        if (now.isBefore(tokens.expires_at)) {
+        const now = new Date();
+        if (isBefore(now, new Date(tokens.expires_at))) {
           // tokens not expired
           return resolve(tokens);
         } else {
diff --git a/src/common/components/Input/DateInput.tsx b/src/common/components/Input/DateInput.tsx
index 77dc470..6e0ffdb 100644
--- a/src/common/components/Input/DateInput.tsx
+++ b/src/common/components/Input/DateInput.tsx
@@ -3,7 +3,7 @@ import { ModalCustomEvent } from '@ionic/core';
 import { DatetimeCustomEvent, IonButton, IonDatetime, IonInput, IonModal } from '@ionic/react';
 import { Control, FieldPath, FieldValues, useController } from 'react-hook-form';
 import classNames from 'classnames';
-import dayjs from 'dayjs';
+import { format } from 'date-fns';
 
 import './DateInput.scss';
 import { PropsWithTestId } from '../types';
@@ -83,7 +83,7 @@ const DateInput = <T extends FieldValues>({
   const onChange = async (e: DatetimeCustomEvent): Promise<void> => {
     const value = e.detail.value as DateValue;
     if (value) {
-      const isoDate = dayjs(value).format('YYYY-MM-DD');
+      const isoDate = format(new Date(value), 'yyyy-MM-dd');
       field.onChange(isoDate);
     } else {
       field.onChange(null);
@@ -117,7 +117,7 @@ const DateInput = <T extends FieldValues>({
 
   // format the value for the IonDatetime. it must be a local ISO date or null/undefined
   const datetimeValue = useMemo(() => {
-    return field.value ? dayjs(field.value).format('YYYY-MM-DD[T]HH:mm') : null;
+    return field.value ? format(new Date(field.value), "yyyy-MM-dd'T'HH:mm") : null;
   }, [field.value]);
 
   return (
diff --git a/src/common/components/Input/DatetimeInput.tsx b/src/common/components/Input/DatetimeInput.tsx
index 42467b8..d8edf43 100644
--- a/src/common/components/Input/DatetimeInput.tsx
+++ b/src/common/components/Input/DatetimeInput.tsx
@@ -3,7 +3,7 @@ import { ModalCustomEvent } from '@ionic/core';
 import { DatetimeCustomEvent, IonButton, IonDatetime, IonInput, IonModal } from '@ionic/react';
 import { Control, FieldPath, FieldValues, useController } from 'react-hook-form';
 import classNames from 'classnames';
-import dayjs from 'dayjs';
+import { format } from 'date-fns';
 
 import './DatetimeInput.scss';
 import { PropsWithTestId } from '../types';
@@ -94,7 +94,7 @@ const DatetimeInput = <T extends FieldValues>({
   const onChange = async (e: DatetimeCustomEvent): Promise<void> => {
     const value = e.detail.value as DatetimeValue;
     if (value) {
-      const isoDate = dayjs(value).toISOString();
+      const isoDate = new Date(value).toISOString();
       field.onChange(isoDate);
     } else {
       field.onChange(null);
@@ -129,7 +129,7 @@ const DatetimeInput = <T extends FieldValues>({
 
   // format the value for the IonDatetime. it must be a local ISO date or null/undefined
   const datetimeValue = useMemo(() => {
-    return field.value ? dayjs(field.value).format('YYYY-MM-DD[T]HH:mm') : null;
+    return field.value ? format(new Date(field.value), "yyyy-MM-dd'T'HH:mm") : null;
   }, [field.value]);
 
   return (
diff --git a/src/pages/Account/AccountPage.tsx b/src/pages/Account/AccountPage.tsx
index 392d41f..76f8351 100644
--- a/src/pages/Account/AccountPage.tsx
+++ b/src/pages/Account/AccountPage.tsx
@@ -12,7 +12,7 @@ import {
 } from '@ionic/react';
 import { useState } from 'react';
 import { useTranslation } from 'react-i18next';
-import dayjs from 'dayjs';
+import { format } from 'date-fns';
 
 import { PropsWithTestId } from 'common/components/types';
 import { config } from 'common/utils/config';
@@ -31,7 +31,7 @@ const AccountPage = ({ testid = 'page-account' }: PropsWithTestId) => {
   const router = useIonRouter();
   const { t } = useTranslation();
 
-  const versionTs = dayjs(config.VITE_BUILD_TS).format('YY.MM.DD.hhmm');
+  const versionTs = format(new Date(config.VITE_BUILD_TS), 'yy.MM.dd.HHmm');
   const sha = config.VITE_BUILD_COMMIT_SHA.substring(0, 7);
   const version = `${versionTs}.${sha}`;
 
diff --git a/src/pages/Account/components/Diagnostics/BuildDiagnostics.tsx b/src/pages/Account/components/Diagnostics/BuildDiagnostics.tsx
index 6036d71..12e7796 100644
--- a/src/pages/Account/components/Diagnostics/BuildDiagnostics.tsx
+++ b/src/pages/Account/components/Diagnostics/BuildDiagnostics.tsx
@@ -1,6 +1,6 @@
 import { IonItem, IonLabel, IonListHeader, IonText } from '@ionic/react';
 import classNames from 'classnames';
-import dayjs from 'dayjs';
+import { format } from 'date-fns';
 import { useTranslation } from 'react-i18next';
 
 import { BaseComponentProps } from 'common/components/types';
@@ -31,7 +31,9 @@ const BuildDiagnostics = ({ className, testid = 'diagnostics-build' }: BaseCompo
       </IonItem>
       <IonItem className="text-sm">
         <IonLabel className="font-medium ion-margin-end">{t('diagnostics.label.time', { ns: 'account' })}</IonLabel>
-        <IonText data-testid={`${testid}-time`}>{dayjs(config.VITE_BUILD_TS).format('YYYY-MM-DD HH:mm:ss Z')}</IonText>
+        <IonText data-testid={`${testid}-time`}>
+          {format(new Date(config.VITE_BUILD_TS), 'yyyy-MM-dd HH:mm:ss xxx')}
+        </IonText>
       </IonItem>
       <IonItem className="text-sm">
         <IonLabel className="font-medium ion-margin-end">{t('diagnostics.label.sha', { ns: 'account' })}</IonLabel>
diff --git a/src/pages/Auth/SignIn/api/useSignIn.ts b/src/pages/Auth/SignIn/api/useSignIn.ts
index 0132324..b596c8e 100644
--- a/src/pages/Auth/SignIn/api/useSignIn.ts
+++ b/src/pages/Auth/SignIn/api/useSignIn.ts
@@ -1,6 +1,6 @@
 import { useMutation, useQueryClient } from '@tanstack/react-query';
 import find from 'lodash/find';
-import dayjs from 'dayjs';
+import { add } from 'date-fns';
 
 import { User } from 'common/models/user';
 import { UserTokens } from 'common/models/auth';
@@ -40,7 +40,7 @@ export const useSignIn = () => {
       storage.setItem(StorageKey.User, JSON.stringify(user));
 
       // simulate the creation of authentication tokens
-      const expires_at = dayjs().add(1, 'hour').toISOString();
+      const expires_at = add(new Date(), { hours: 1 }).toISOString();
       const tokens: UserTokens = {
         access_token: 'access_token',
         id_token: 'id_token',