Sp-dev-docs: TimeZoneInfo wrong daylightDate and standardDate

[mirkori]

Category

• [x] Bug

Expected Behavior

TimeZoneInfo on context.pageContext.user should enable me to convert UTC to local time.

e.g. for timezone "(UTC+1) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna" (TimeZoneId 4)
daylightDate should be: March 31 2019 02:00 CET

Observed Behavior

TimeZoneInfo returns wrong dates for daylightDate (Day 5 of Month 3) and standardDate (Day 5 of Month 10) .
dates are returned as ISPSystemTime

I want to convert UTC to local time. Conversion with the formula from https://docs.microsoft.com/en-us/javascript/api/sp-page-context/sptimezone?view=sp-typescript-latest gives wrong results.

[msft-github-bot]

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[mirkori]

This issue seems to be not only present in the spfx WebPartContext class but also in sync with _spPageContextInfo.userTimeZoneData on classic sites and pages, where the same wrong DaylightDate and StandardDate objects are returned.

[mirkori]

Any updates on this one? Its one week until summer time DST in Europe.

[ghost]

@mirkori Are you still seeing issues here?

[msft-github-bot]

This issue has been automatically marked as stale because it has marked as requiring author feedback but has not had any activity for 7 days. It will be closed if no further activity occurs within next 7 days of this comment. Thank you for your contributions to SharePoint Developer activities.

[mirkori]

This issue still exists for probably all timezones.

Daylight Savings for Pacific Time:

_spPageContextInfo.userTimeZoneData:

[ahessami]

Hey there... is there any progress on this issue? I'm also experiencing the same issue with the incorrect daylightDate (screenshot below):

[kemesfun]

The calculation of the date is correct, but the daylightDate doesn't have a public documentation, so the values will seem misleading. Here are the some of the non obvious property descriptions for daylightDate:
DayOfWeek = 0-6, Sunday - Saturday
Day = the Nth DayOfWeek in that month
@ahessami that example would be interpreted as the 2nd Sunday of March (March 10th)
There will be an update to the public API.

[mirkori]

Thank you for the clarification @kemesfun . Should "day" be actually named "weekOfMonth" in this case, to align to the "dayOfWeek" naming?

[kemesfun]

@mirkori The variable name change is something we may consider, but whether or not this api will go beyond beta is still unknown.

[msft-github-bot]

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