DevTools Error: Unsupported time zone specified undefined

[brunoxd13]

Initial URL: http://localhost:3000/
Chrome Version: 69.0.3497.92
Error Message: Unsupported time zone specified undefined
Stack Trace:

RangeError: Unsupported time zone specified undefined
    at new DateTimeFormat (native)
    at Date.toLocaleTimeString (native)
    at new Audits2.ReportSelector.Item (chrome-devtools://devtools/bundled/audits2/audits2_module.js:242:460)
    at Audits2.Audits2Panel._buildReportUI (chrome-devtools://devtools/bundled/audits2/audits2_module.js:184:28)
    at Audits2.Audits2Panel._startAudit (chrome-devtools://devtools/bundled/audits2/audits2_module.js:192:181)

[wardpeet]

I believe @paulirish is the best man to answer this. I don't know the devtools pipeline about lighthouse.

the issues seems to be here https://cs.chromium.org/chromium/src/out/Debug/gen/devtools/audits2/audits2_module.js?q=_buildReportUI&sq=package:chromium&dr=C&l=242

edit(paulirish): unminified, it's coming from here.

[paulirish]

@brunoxd13 thanks very much for reporting. this is quite interesting.

what operating system are you running this on?

this bug indicates your system doesn't know what time zone it's configured for. do you know if a time zone is set in your OS settings?

---

to team: we also hit this back here and fixed it on the LH side in #1067. I guess we need to try/catch it everywhere.

[paulirish]

Ah this appears to be this upstream bug: https://bugs.chromium.org/p/chromium/issues/detail?id=364374
It is fixed in Chrome, so Chrome Canary shouldn't be a problem.

@brunoxd13 if you want to try again with Chrome Canary, please let us know if it's fixed there.

[brunoxd13]

@paulirish @wardpeet I was able to solve the problem, it was my GTM configuration that was in manual mode, so I put automatic worked. Thaks a lot.

[wardpeet]

@brunoxd13 oh so we could easily reproduce this with gtm?

[brunoxd13]

@wardpeet I believe that manually changing.

[paulirish]

@brunoxd13 whats GTM? google tag manager?

[brunoxd13]

@paulirish I believe that @wardpeet meant gmt, not gmt. Is it ok?

[wardpeet]

Hehe sorry I thought you meant Google tag manager TBH 🙈. It was weird that gtm would mess with datetime settings but we had weirder issues

[paulirish]

@brunoxd13 your GMT configuration was in manual mode? this is on windows?

[brunoxd13]

@paulirish My configurations were in manual mode, I was using Ubuntu Linux

[wardpeet]

i'll spin up an ubuntu vm and try it out

[wardpeet]

@brunoxd13 how do you set it to manual mode?

are you editting /etc/timezone yourself?

[brunoxd13]

@wardpeet I edited through the interface, I did not use the file at any time.
Change the timezone and try.

[wardpeet]

I did and no error.

Could you maybe step me through

1. set timezone to.. ?
2. open chrome on a page
3. run lighthouse through the audit panel
4. lighthouse report has errors about timezone?

[brunoxd13]

@wardpeet I do not remember very well the configuration of my operating system, however I remember that when you use some website that used the time like WhatsApp, the time was changed.

[brendankenny]

closing in favor of #6691 (see #6691 (comment))