This KB will show you how to configure a user mailbox time zone settings on Exchange 2013 and 2013 using PowerShell.
To configure the Time Zone we need to use the Exchange Shell and use the cmdlets:
Set –mailboxregionalconfiguration
To view the settings type:
get –mailboxregionalconfiguration –administrator |ft
To set a new time zone type:
Set-mailboxregionalconfiguration administrator –timezone “aus Eastren Standard Time”
To reset the configuration type:
Set-mailboxregionalconfiguration administrator –timezone $null
Users can also change the time zone from OWA by going to Options -> Settings -> Regional -> Current time zone:
