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Domenick
Helper IV
Helper IV

How do I create a custom global function? (for time zone conversion)

I want to write a custom function to convert datetime from UTC to PST/PDT. Can someone point me in the right direction? I want to use the function across multiple reports. The only guidance I've found is file-specific.

 

Also would be cool if you just knew of an already existing function that easily converts to a different timezone; that would be great.

2 ACCEPTED SOLUTIONS
jdbuchanan71
Super User
Super User

@Domenick 

You can add a custom column in PowerQuery to adjust the UTC back like this.

[Date] + #duration(0,-8,0,0)

jdbuchanan71_0-1662574502625.png

 

View solution in original post

Domenick
Helper IV
Helper IV

I solved this by adding a Custom Column in Query Editor which brings the time in as UTC and converts it to PST or PDT based appropriately. The -7 and the -8 are the offset hours (Pacific time is either 7 or 8 hours behind UTC depending on the time of year). I strung this solution together with the help of this guidance by @Rickmaurinus : https://gorilla.bi/power-query/last-refresh-datetime/  

 

 

let
UTC_DateTimeZone = DateTimeZone.UtcNow(),
UTC_Date = Date.From(UTC_DateTimeZone),
StartSummerTime = Date.StartOfWeek(#date(Date.Year(UTC_Date), 3, 31), Day.Sunday),
StartWinterTime = Date.StartOfWeek(#date(Date.Year(UTC_Date), 10, 31), Day.Sunday),
UTC_Offset = if UTC_Date >= StartSummerTime and UTC_Date < StartWinterTime then -7 else -8,
PST_Timezone = DateTimeZone.SwitchZone(UTC_DateTimeZone, UTC_Offset)
in
PST_Timezone

View solution in original post

6 REPLIES 6
jdbuchanan71
Super User
Super User

Nice, thank you for sharing your final solution @Domenick .

Domenick
Helper IV
Helper IV

I solved this by adding a Custom Column in Query Editor which brings the time in as UTC and converts it to PST or PDT based appropriately. The -7 and the -8 are the offset hours (Pacific time is either 7 or 8 hours behind UTC depending on the time of year). I strung this solution together with the help of this guidance by @Rickmaurinus : https://gorilla.bi/power-query/last-refresh-datetime/  

 

 

let
UTC_DateTimeZone = DateTimeZone.UtcNow(),
UTC_Date = Date.From(UTC_DateTimeZone),
StartSummerTime = Date.StartOfWeek(#date(Date.Year(UTC_Date), 3, 31), Day.Sunday),
StartWinterTime = Date.StartOfWeek(#date(Date.Year(UTC_Date), 10, 31), Day.Sunday),
UTC_Offset = if UTC_Date >= StartSummerTime and UTC_Date < StartWinterTime then -7 else -8,
PST_Timezone = DateTimeZone.SwitchZone(UTC_DateTimeZone, UTC_Offset)
in
PST_Timezone

Domenick, 

 

I think the function you used is the easiest approach. At this point we can't make it a global function though. I hope the Microsoft Team will release a functionality that does support this in the future. 

 

Until then, save the query somewhere or copy it from the blogpost 🙂

 

Enjoy!

Rick

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If this post helps, then please consider accepting it as the solution to help other members find it more quickly.

jdbuchanan71
Super User
Super User

No, because UTC is not affected by daylight saving time.

jdbuchanan71
Super User
Super User

@Domenick 

You can add a custom column in PowerQuery to adjust the UTC back like this.

[Date] + #duration(0,-8,0,0)

jdbuchanan71_0-1662574502625.png

 

Will that account for daylight savings?

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