I am calling a web service from the Appian using the web service smart service.

Where is the WSDL hosted? Does the web service host timezone match that of your Appian server?

Service is hosted in EST timezone. Appian is cloud instance & EST time Zone is selected under internationalization settings.

Wrap it in the gmt function. Example

gmt(pv!DATE_RETRIEVED_GOES_HERE,usertimezone())

or simply: gmt(pv!DATE_RETRIEVED_GOES_HERE)

Actually We are pulling & pushing data by services.The services and Database are hosted in EST Timezone.

Since WCF services does not support Data data type we are getting date time data type in the Request/ Response interfaces, but in the UI we using date component to display it.
In out project only data is significant part & times doesn't. We are showing only date we are showing/ updating on UI.

Do I need to use gmt function when i am pulling &pushing data ?

Since dates are expected to be in GMT for Appian to transform them to the end user's timezone then yes, I suggest you test this:

For reading: gmt(pv!DATE_RETRIEVED_GOES_HERE,usertimezone())
For inserting: local(pv!DATE_RETRIEVED_GOES_HERE,usertimezone())

Hi Eduardo, is there any way which we can avoid this timezone conversion when we get the data from the Services???
Its happening that, when we get the data itself, in d response the data coming is a converted one. can t we stop this and get the same datetime as returned by the service?? withouhg using any timezone functions?

Per the documentation Appian stores all dates in GMT to be able to display them in the end user's preferred timezone, therefore you need to do the necessary conversion to make sure Appian stores them in GMT given they come in a different time zone.

This is not needed when the date-time is provided within Appian because Appian is able to transform it and store it GMT.