install package

package.json

@@ -207,6 +207,7 @@
     "i18next-browser-languagedetector": "^4.0.1",
     "imports-loader": "^0.8.0",
     "jest": "^25.1.0",
+    "jest-date-mock": "^1.0.8",
     "jquery-slimscroll": "^1.3.8",
     "jquery-ui": "^1.12.1",
     "jquery.cookie": "~1.4.1",

yarn.lock

@@ -8161,6 +8161,11 @@ jest-config@^25.1.0:
     pretty-format "^25.1.0"
     realpath-native "^1.1.0"
 
+jest-date-mock@^1.0.8:
+  version "1.0.8"
+  resolved "https://registry.yarnpkg.com/jest-date-mock/-/jest-date-mock-1.0.8.tgz#13468c0352c5a3614c6b356dbc6b88eb37d9e0b3"
+  integrity sha512-0Lyp+z9xvuNmLbK+5N6FOhSiBeux05Lp5bbveFBmYo40Aggl2wwxFoIrZ+rOWC8nDNcLeBoDd2miQdEDSf3iQw==
+
 jest-diff@^25.1.0:
   version "25.1.0"
   resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-25.1.0.tgz#58b827e63edea1bc80c1de952b80cec9ac50e1ad"