It basically shows 24 hours, but if you have set it up less than 24 hours ago it works but the time-line on the x-axis is a bit weird. Once you have a full 24 hours it should be fine. There will be a faint vertical line showing the date change moving across the graph.
I don't know how it handles different time zones, but the UK moved to GMT+1 (BST = British Summer Time) at 1am Sunday 29 March. For us it is now showing BST.
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Edited by RobertoS (Mon 30-Mar-20 18:13:48)