luci-app-nlbwmon: Fixed incorrect period parameter/display

Switch from using the unreliable string data constructor syntax to
a more explicit year / month / day variant and pass through the
period value as-is in order to ensure that the proper start date
is requested from the backend.

This should fix issues with prevent the display of older data
periods in the nlbwmon gui.

Ref: https://github.com/jow-/nlbwmon/issues/25
Ref: https://github.com/openwrt/luci/pull/2496
Suggested-by: Aktanusa <chanam.geo@yahoo.com>
[squashed commits, add a more thorough commit message]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 6 insertions, 4 deletions

diff --git a/applications/luci-app-nlbwmon/htdocs/luci-static/resources/view/nlbw.js b/applications/luci-app-nlbwmon/htdocs/luci-static/resources/view/nlbw.js
index e5ae69b3a..8a01b1db4 100644
--- a/applications/luci-app-nlbwmon/htdocs/luci-static/resources/view/nlbw.js
+++ b/applications/luci-app-nlbwmon/htdocs/luci-static/resources/view/nlbw.js
@@ -226,13 +226,15 @@ function renderPeriods()
 	var sel = document.getElementById('nlbw.period');
 
 	for (var e, i = trafficPeriods.length - 1; e = trafficPeriods[i]; i--) {
-		var d1 = new Date(e);
-		var d2, pd;
+		var ymd1 = e.split(/-/);
+		var d1 = new Date(+ymd1[0], +ymd1[1] - 1, +ymd1[2]);
+		var ymd2, d2, pd;
 
 		if (i) {
-			d2 = new Date(trafficPeriods[i - 1]);
+			ymd2 = trafficPeriods[i - 1].split(/-/);
+			d2 = new Date(+ymd2[0], +ymd2[1] - 1, +ymd2[2]);
 			d2.setDate(d2.getDate() - 1);
-			pd = '%04d-%02d-%02d'.format(d1.getFullYear(), d1.getMonth() + 1, d1.getDate());
+			pd = e;
 		}
 		else {
 			d2 = new Date();