Daylight Saving Time changes for UK

Question

We switch our primary timezone from GMT to GMT+1 in the Appian admin console during UK daylight saving time. 
 In the application, we display all dates using a text() function, like this: 
 
 if ( 
 a ! isNotNullOrEmpty ( ri ! dateTime ) , 
 text ( ri ! dateTime , "dd/MM/yyyy hh:mm AM/PM" ) , 
 "" 
 ) 
 
 However, as soon as the timezone is updated in the admin console, the displayed date values shift according to the new timezone. This causes the date and time shown in the UI to change even though the stored datetime has not changed. 
 Is there any way to keep the displayed date consistent regardless of timezone changes?

Stefan Helzle · Answer

Why do you change the timezone? By default the timezone setting includes daylight saving when using timezones have a city or country name in it. 
 This is not something you should have to do.

Shubham Aware · Answer

Don't manually change Admin timezone for DST. Set Primary Timezone to Europe/London instead of GMT/GMT+1. Appian automatically handles DST - no UI date shifts, no code changes needed.