Converting a Date Time Field to Another Time Zone Accounting for Daylight Savings

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Converting a Date Time Field to Another Time Zone Accounting for Daylight Savings

Published: 19 Apr 2017
Last Modified Date: 09 Jan 2019

Question

How to convert a date time field to another time zone accounting for daylight savings. For example:

Arizona uses MT but does not use daylight savings
Washington uses PDT starting March 12 and ending November 5
Therefore, between March 12 and November 5, there is no time difference between Washington and Arizona, but the rest of the year Arizona is one hour ahead.

Environment

Tableau Desktop

Answer

Create a calculation that conditionally adds a different number of hours based on what the date is. Based on the above example, the following formula could be used:

IF [Date Field] >= DATE( "3/12/" + YEAR( [Date Field] ) )
AND TODAY < DATE( "11/5/" + YEAR( [Date Field] ) )
THEN [Date Field]
ELSE DATEADD( 'hour', 1, [Date Field] )
END