FIX: recurring was not working for some cases (eg: hours and unit > 1) (#11657)

plugins/discourse-local-dates/assets/javascripts/lib/date-with-zone-helper.js.es6

@@ -10,7 +10,7 @@ const { getProperties } = Ember;
   - isDST() allows to know if a date in a specified timezone is currently under DST
   - datetimeWithZone(timezone) returns a new moment object with timezone applied
   - datetime returns the moment object
-  - repetitionsBetweenDates(duration, date) return the number of repertitions of
+  - unitRepetitionsBetweenDates(duration, date) return the number of repertitions of
   duration between two dates, eg for duration: "1.weeks", "2.months"...
 */
 export default class DateWithZoneHelper {
@@ -35,11 +35,18 @@ export default class DateWithZoneHelper {
     return this.datetime.tz(this.localTimezone).isDST();
   }
 
-  repetitionsBetweenDates(duration, date) {
+  unitRepetitionsBetweenDates(duration, date) {
     const [count, unit] = duration.split(".");
-    const diff = this.datetime.diff(date, unit);
-    const repetitions = diff / parseInt(count, 10);
-    return Math.abs((Math.round(repetitions * 10) / 10).toFixed(1));
+    // get the diff in the specified units with decimals
+    const diff = Math.abs(this.datetime.diff(date, unit, true));
+    // get integer count of duration in diff, eg: 4 hours diff is 2 for 2.hours duration
+    const integer = Math.trunc(diff / count);
+    // get fractional to define if we have to add one "duration"
+    const fractional = (diff / count) % 1;
+
+    return (
+      integer * parseInt(count, 10) + (fractional > 0 ? parseInt(count, 10) : 0)
+    );
   }
 
   add(count, unit) {

plugins/discourse-local-dates/assets/javascripts/lib/local-date-builder.js.es6

@@ -48,14 +48,14 @@ export default class LocalDateBuilder {
     });
 
     if (this.recurring && moment().isAfter(localDate.datetime)) {
-      const [count, type] = this.recurring.split(".");
+      const type = this.recurring.split(".")[1];
 
-      const repetitionsForType = localDate.repetitionsBetweenDates(
+      const repetitionsForType = localDate.unitRepetitionsBetweenDates(
         this.recurring,
         moment.tz(this.localTimezone)
       );
 
-      localDate = localDate.add(repetitionsForType + parseInt(count, 10), type);
+      localDate = localDate.add(repetitionsForType, type);
     }
 
     const previews = this._generatePreviews(localDate, displayedTimezone);

plugins/discourse-local-dates/test/javascripts/lib/date-with-zone-helper-test.js.es6

@@ -28,7 +28,7 @@ test("#format", function (assert) {
   assert.equal(date.format(), "2020-03-15T15:36:00.000+01:00");
 });
 
-test("#repetitionsBetweenDates", function (assert) {
+test("#unitRepetitionsBetweenDates", function (assert) {
   let date;
 
   date = buildDateHelper({
@@ -39,7 +39,7 @@ test("#repetitionsBetweenDates", function (assert) {
     timezone: PARIS,
   });
   assert.equal(
-    date.repetitionsBetweenDates(
+    date.unitRepetitionsBetweenDates(
       "1.hour",
       moment.tz("2020-02-15 15:36", SYDNEY)
     ),
@@ -55,7 +55,7 @@ test("#repetitionsBetweenDates", function (assert) {
     timezone: PARIS,
   });
   assert.equal(
-    date.repetitionsBetweenDates(
+    date.unitRepetitionsBetweenDates(
       "1.minute",
       moment.tz("2020-02-15 15:36", PARIS)
     ),
@@ -71,7 +71,7 @@ test("#repetitionsBetweenDates", function (assert) {
     timezone: PARIS,
   });
   assert.equal(
-    date.repetitionsBetweenDates(
+    date.unitRepetitionsBetweenDates(
       "1.minute",
       moment.tz("2020-02-15 15:37", PARIS)
     ),
@@ -87,11 +87,11 @@ test("#repetitionsBetweenDates", function (assert) {
     timezone: PARIS,
   });
   assert.equal(
-    date.repetitionsBetweenDates(
-      "2.minute",
+    date.unitRepetitionsBetweenDates(
+      "2.minutes",
       moment.tz("2020-02-15 15:41", PARIS)
     ),
-    2.5,
+    6,
     "it correctly finds difference with a multiplicator"
   );
 });

plugins/discourse-local-dates/test/javascripts/lib/local-date-builder-test.js.es6

@@ -233,6 +233,21 @@ test("option[recurring]", function (assert) {
       "it works for a future date"
     );
   });
+
+  freezeTime({ date: "2021-01-08 11:16" }, () => {
+    assert.buildsCorrectDate(
+      {
+        date: "2021-01-05",
+        time: "14:00",
+        recurring: "2.hours",
+        timezone: NEW_YORK,
+      },
+      {
+        formated: "Today 12:00 PM",
+      },
+      "it works with hours"
+    );
+  });
 });
 
 test("option[countown]", function (assert) {