Explain time zone of the lookback parameter

[yurishkuro]

Moved from jaegertracing/jaeger#372

When "Custom Time Range" is specified, it would be good to show in which time zone the entered values are interpreted, either via (?) icon or explicitly "Start Time (TZ=New York [UTC-0500])".

[tiffon]

Sounds good.

Is UTC-0500 always the relevant time-zone?

Also, as a bit of an aside, I'll add a note to the "Tags" info tooltip noting only exact matches are supported.

[black-adder]

Can you identify the timezone from the browser so that's it's always relevant to the user?

[tiffon]

Yes, we can get the timezone the browser is using, but, what timezone does the query-service generally interpret the date/time as?

[yurishkuro]

query-service doesn't interpret it, because UI is passing a Unix timestamp, which is relative to an absolute point in time, midnight of Jan 1 1970 in UTC time.

[tiffon]

Got it. Yes, I can add a note stating the time-values being entered are in local timezone of the browser and will be converted to UTC when sent to the server.

[yurishkuro]

"local" is good, but actually showing what it is is even better.

[tiffon]

@yurishkuro I agree, 100%.