diff --git a/core/js/dist/login.js b/core/js/dist/login.js
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diff --git a/core/js/dist/main.js b/core/js/dist/main.js
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diff --git a/core/js/dist/maintenance.js b/core/js/dist/maintenance.js
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diff --git a/core/src/OC/util.js b/core/src/OC/util.js
index f8f7c05e6e8cb25ca6722881cc8fc17257b7bf09..67f00bf30d3b69317522e176e2712520be87ca6f 100644
--- a/core/src/OC/util.js
+++ b/core/src/OC/util.js
@@ -114,6 +114,7 @@ export default {
 	 * @returns {string} timestamp formatted as requested
 	 */
 	formatDate: function(timestamp, format) {
+		console.warn('OC.Util.formatDate is deprecated and will be removed in Nextcloud 21. See @nextcloud/moment')
 		format = format || 'LLL'
 		return moment(timestamp).format(format)
 	},
@@ -123,6 +124,7 @@ export default {
 	 * @returns {string} human readable difference from now
 	 */
 	relativeModifiedDate: function(timestamp) {
+		console.warn('OC.Util.relativeModifiedDate is deprecated and will be removed in Nextcloud 21. See @nextcloud/moment')
 		const diff = moment().diff(moment(timestamp))
 		if (diff >= 0 && diff < 45000) {
 			return t('core', 'seconds ago')