Timezone and DstFl are available in the ListUsers output. DstFl indicates that the user is *currently* using Daylight Saving/Summer Time. Timezone is standard timezone offset & name (windows style, not IANA)
(UTC-05:00) Eastern Time (US & Canada)
(UTC) Coordinated Universal Time
(UTC+00:00) Dublin, Edinburgh, Lisbon, London
etc.
TPAM use .NET APIs to do all the timezone / dst conversions.