I am using jquery flot for showing graph. Everything is working fine but vertical line are wrong.

Feb 16 vertical line should be move to the left size.
I tested with number and it’s working perfect. It only problem in x aixs.
var plot = $.plot($("#placeholder"),
[ { data: data1, label: "data1"} , {data:users, label:"users"}], {
series: {
lines: { show: true },
points: { show: true }
},
xaxes: [ {mode: "time"} ],
grid: { hoverable: true, clickable: false },
legend: {container: $("#labeler")}
});
Found a problem.
PHP date string to timestamp * 1000 is a wrong way.
Correct one is