diff --git a/src/plugin/localeData/index.js b/src/plugin/localeData/index.js
index 71ded86de..b753c3d67 100644
--- a/src/plugin/localeData/index.js
+++ b/src/plugin/localeData/index.js
@@ -38,7 +38,8 @@ export default (o, c, dayjs) => { // locale needed later
       weekdaysShort: () => dayjs.weekdaysShort(),
       weekdaysMin: () => dayjs.weekdaysMin(),
       months: () => dayjs.months(),
-      monthsShort: () => dayjs.monthsShort()
+      monthsShort: () => dayjs.monthsShort(),
+      longDateFormat: format => localeObject.formats[format]
     }
   }
 
diff --git a/test/plugin/localeData.test.js b/test/plugin/localeData.test.js
index 109d4780d..a2e017e90 100644
--- a/test/plugin/localeData.test.js
+++ b/test/plugin/localeData.test.js
@@ -61,6 +61,10 @@ it('Global localeData', () => {
     expect(dayjsLocaleData.weekdays()).toEqual(momentLocaleData.weekdays())
     expect(dayjsLocaleData.weekdaysShort()).toEqual(momentLocaleData.weekdaysShort())
     expect(dayjsLocaleData.weekdaysMin()).toEqual(momentLocaleData.weekdaysMin())
+    const longDateFormats = ['LT', 'LTS', 'L', 'LL', 'LLL', 'LLLL']
+    longDateFormats.forEach((f) => {
+      expect(dayjsLocaleData.longDateFormat(f)).toEqual(momentLocaleData.longDateFormat(f))
+    })
   })
 })