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Why does the date/time scale info vary with the timezone of the machine running the browser?

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I have a system monitoring application (Uptime) that displays graphs with time/date data. The times displayed on a given set of data vary depending on where the browser is located. For example the site is hosted on a server in the US running on EDT. I select data for a period say midnight to 6am EDT. If I display that on a Firefox client also running on EDT the timescale shows 00:00 to 06:00. If I display that same data on a browser on a desktop in London it shows a timescale of 05:00 to 11:00.

I have a system monitoring application (Uptime) that displays graphs with time/date data. The times displayed on a given set of data vary depending on where the browser is located. For example the site is hosted on a server in the US running on EDT. I select data for a period say midnight to 6am EDT. If I display that on a Firefox client also running on EDT the timescale shows 00:00 to 06:00. If I display that same data on a browser on a desktop in London it shows a timescale of 05:00 to 11:00.