handle ISO format dates. Issue #149 (#151)

server/occurrence.go

@@ -796,6 +796,15 @@ func (p *Plugin) onEN(when string, user *model.User) (times []time.Time, err err
 	chronoTime := "9:00AM"
 	if len(dateTimeSplit) > 1 {
 		chronoTime = dateTimeSplit[1]
+	} else {
+		timeTest := strings.Split(chronoDate, " ")
+		if len(timeTest) > 1 {
+			check := timeTest[len(timeTest)-1]
+			if strings.Contains(check, ":") {
+				chronoDate = strings.Join(timeTest[:len(timeTest)-1], " ")
+				chronoTime = check
+			}
+		}
 	}
 
 	dateUnit, ndErr := p.normalizeDate(chronoDate, user)

server/occurrence_test.go

@@ -496,6 +496,12 @@ func TestOn(t *testing.T) {
 		assert.True(t, times[0].In(location).Month() == 1 && times[0].In(location).Day() == 1 &&
 			times[0].In(location).Hour() == 0)
 
+		times, err = p.onEN("on 2020-08-10 13:55", user)
+		assert.Nil(t, err)
+		assert.True(t, times[0].In(location).Year() == 2020 &&
+			times[0].In(location).Month() == 8 && times[0].In(location).Day() == 10 &&
+			times[0].In(location).Hour() == 13 && times[0].In(location).Minute() == 55)
+
 	})
 }
 

server/parse.go

@@ -677,6 +677,31 @@ func (p *Plugin) normalizeDate(text string, user *model.User) (string, error) {
 		}
 		return parts[2] + "-" + parts[0] + "-" + parts[1] + "T00:00:00Z", nil
 
+	} else if match, _ := regexp.MatchString("^([0-9]{4}-[0-9]{2}-[0-9]{2})", date); match {
+
+		date := p.regSplit(date, "-")
+
+		switch len(date) {
+		case 3:
+			year, yErr := strconv.Atoi(date[0])
+			if yErr != nil {
+				return "", yErr
+			}
+			month, mErr := strconv.Atoi(date[1])
+			if mErr != nil {
+				return "", mErr
+			}
+			day, dErr := strconv.Atoi(date[2])
+			if dErr != nil {
+				return "", dErr
+			}
+
+			return time.Date(year, time.Month(month), day, 0, 0, 0, 0, location).Format(time.RFC3339), nil
+
+		default:
+			return "", errors.New("unrecognized date")
+		}
+
 	} else if match, _ := regexp.MatchString("^(([0-9]{2}|[0-9]{1})(-|/)([0-9]{2}|[0-9]{1})((-|/)([0-9]{4}|[0-9]{2}))?)", date); match {
 
 		date := p.regSplit(date, "-|/")