Hi,
Thanks .. I find the answer
Get-NaSnapshot FFDxxxxxxxxx_SQL_DB | select name, @{Name="AccessTime"; Expression={[timezone]::CurrentTimeZone.ToLocalTime(([datetime]'1/1/1970').AddSeconds($_.AccessTime))}}
Name AccessTime
---- ----------
sqlsnap__ffdxxxxxxxxx_02-23-2012_19.00.26__daily 2/23/2012 7:02:21 PM
sqlsnap__ffdxxxxxxxxx_02-24-2012_19.45.21__daily 2/24/2012 7:46:49 PM
sqlsnap__ffdxxxxxxxxx_02-25-2012_19.00.12__daily 2/25/2012 7:01:51 PM
sqlsnap__ffdxxxxxxxxx_02-27-2012_19.00.10__daily 2/27/2012 7:01:34 PM
sqlsnap__ffdxxxxxxxxx_02-28-2012_19.00.28__daily 2/28/2012 7:02:33 PM
sqlsnap__ffdxxxxxxxxx_02-29-2012_19.00.12__daily 2/29/2012 7:02:07 PM