Given the following backup sets ...

Found primary backup chain with matching signature chain:
-------------------------
Chain start time: Tue Jun 21 11:27:26 2011
Chain end time: Tue Jun 21 11:27:59 2011
Number of contained backup sets: 2
Total number of contained volumes: 2
Type of backup set:                            Time:      Num volumes:
     Full         Tue Jun 21 11:27:26 2011                 1
     Incremental         Tue Jun 21 11:27:59 2011                 1

If i run the following command, it works (1308655646 was converted from Tue Jun 21 11:27:26 2011):

duplicity --no-encryption --restore-time 1308655646 --file-to-restore ORIG_FILE \
file:///storage/test/ restored-file.txt

However, if I run the following command, it restores the from the latest set.

duplicity --no-encryption --restore-time 2011-06-21T11:27:26 --file-to-restore \
ORIG_FILE file:///storage/test/ restored-file.txt

What am I doing wrong w/ the time? I prefer the second option only because I don't want to have to do the conversion manually.