how to create time range for every 30 mins and display in bar chart

[#1]

Hi, how do I create time range for every half an hour and display in bar chart? I have a list box called timediff that displays the time intervals I derived between 2 columns. I've been trying many codes but nothing just seems to work. Thanks.

[SergeyMak]

so. you can try to built separate column as Hour

Then use Axes\Step=0.5 to show every half an hour

PFA