diff --git a/packages/gatsby/src/schema/infer-graphql-type.js b/packages/gatsby/src/schema/infer-graphql-type.js
index 21a32864f58ca..b699716346169 100644
--- a/packages/gatsby/src/schema/infer-graphql-type.js
+++ b/packages/gatsby/src/schema/infer-graphql-type.js
@@ -127,6 +127,12 @@ function inferGraphQLType({
             measurement years, months, weeks, days, hours, minutes,
             and seconds.`,
         },
+        locale: {
+          type: GraphQLString,
+          description: oneLine`
+            Configures the locale Moment.js will use to format the date.
+          `,
+        },
       },
       resolve(object, { fromNow, difference, formatString, locale = `en` }) {
         let date