Fix timezone error on metric point api.

[Sevenn83]

It would fix #3794, #2459.

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[jbrooksuk]

Looks like the tests need updating.

[zanechua]

Can confirm that this fix does fix the timezone issue on the latest 2.4 branch (cfd173c).

• Set system timezone
• Set .env timezone
• Set timezone in app

[rpartapsing]

For me it crashed the metric section Leaving me with a "loading data" screen

[westej2]

these fixes worked for me.

[jbrooksuk]

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