Set time zones based on client

[roughpandaz]

Description:

We should enable the page to resolve the the local timezone.
This can be achieved through:
Intl.DateTimeFormat().resolvedOptions().timeZone

Questions: Is there a reason why this isn't done?
Happy to create PR for this.

[wslyvh]

Hi, no specific reason why this isn't done, no. But it obviously makes sense.
Would be great if you can submit a PR.

[roughpandaz]

@wslyvh Would be happy to do it.
To help me get started, could you let me know which file(s) I should be looking at?
I see these files so far:

• ethgaswatch/web/src/components/gasprices.tsx

  Line 46 in 0277d2f

  <small className="text-muted">Last update: {TimestampToTimeAgo(gasData.lastUpdated)}</small>

• https://github.com/wslyvh/ethgaswatch/blob/23d3ab793f884e20fed94eaf3fa494ac59b0a4df/web/src/components/gaschart.tsx