By default all AzureDevOps accounts are set by UTC (Coordinated Universal Time) irrespective of what zones they are hosted in. Even if you migrate from TFS to AzureDevOps you will be still in UTC time.
Changing the timezone will not change the timezone for all the users (Users have an individual preference to choose their timezone)
Let us see how to change the timezone
Step 1: Go to Settings —> Overview
Step 2: Scroll to TimeZone
Step 3: Select the Timezone of your choice and click on save at the bottom of page