Remove unnecessary helper function `DateFmtLong` (#24343)

After #24317 this function is only used in one place where it is not
needed. I confirmed the timestamp still renders correctly

Signed-off-by: Yarden Shoham <git@yardenshoham.com>

modules/templates/helper.go

@@ -141,9 +141,6 @@ func NewFuncMap() []template.FuncMap {
 		"TimeSinceUnix": timeutil.TimeSinceUnix,
 		"DateTime":      timeutil.DateTime,
 		"Sec2Time":      util.SecToTime,
-		"DateFmtLong": func(t time.Time) string {
-			return t.Format(time.RFC3339)
-		},
 		"LoadTimes": func(startTime time.Time) string {
 			return fmt.Sprint(time.Since(startTime).Nanoseconds()/1e6) + "ms"
 		},

templates/admin/cron.tmpl

@@ -21,7 +21,7 @@
 						<td><button type="submit" class="ui green button" name="op" value="{{.Name}}" title="{{$.locale.Tr "admin.dashboard.operation_run"}}">{{svg "octicon-triangle-right"}}</button></td>
 						<td>{{$.locale.Tr (printf "admin.dashboard.%s" .Name)}}</td>
 						<td>{{.Spec}}</td>
-						<td>{{DateTime "full" (DateFmtLong .Next)}}</td>
+						<td>{{DateTime "full" .Next}}</td>
 						<td>{{if gt .Prev.Year 1}}{{DateTime "full" .Prev}}{{else}}N/A{{end}}</td>
 						<td>{{.ExecTimes}}</td>
 						<td {{if ne .Status ""}}data-tooltip-content="{{.FormatLastMessage $.locale}}"{{end}} >{{if eq .Status ""}}—{{else if eq .Status "finished"}}{{svg "octicon-check" 16}}{{else}}{{svg "octicon-x" 16}}{{end}}</td>