ANSWER:

  
10.20에서 /var/adm/sw/patch/PATCH.log 화일과 같이 11.X에서는 swlist 에서install_date 이라는 attribute를 주어서 찾아볼 수 있습니다.
    
According to the sd(4) man page, the install_date attribute (-a)
gives you, "The installation date of the product or bundle."

  

# swlist -l patch -a install_date   PHKL_18543  
# Initializing...
# Contacting target "chicago"...
#
# Target:  chicago:/
#
# PHKL_18543                            200110221605.53
# PHKL_18543.C-INC                      200108171859.16
# PHKL_18543.CORE-KRN                   200108171859.16
# PHKL_18543.CORE2-KRN                  200108171859.16
# PHKL_18543.KERN2-RUN                  200108171859.16
# PHKL_18543.VXFS-ADV-KRN               200110221605.53
# PHKL_18543.VXFS-BASE-KRN              200108171859.16
# PHKL_18543.VXFS-PRG                   200108171859.16


이때 오른쪽에 나오는 숫자를 다음과 같이 날짜로 계산하면 됩니다.

YYYYMMDDHHMM.SS = 200108171859.16 = August 17, 2001 18:59:16

"install_date" attribute 대신에 "date"를 써도 비슷한 결과를 얻을 수 있습니다.

  

# swlist -l patch -a date   PHKL_18543 # Initializing...
# Contacting target "chicago"...
#
# Target:  chicago:/
#
# PHKL_18543/                           Mon Oct 22 16:05:53 EDT 2001
# PHKL_18543.C-INC                      Fri Aug 17 18:59:16 EDT 2001
# PHKL_18543.CORE-KRN                   Fri Aug 17 18:59:16 EDT 2001
# PHKL_18543.CORE2-KRN                  Fri Aug 17 18:59:16 EDT 2001
# PHKL_18543.KERN2-RUN                  Fri Aug 17 18:59:16 EDT 2001
# PHKL_18543.VXFS-ADV-KRN               Mon Oct 22 16:05:53 EDT 2001
# PHKL_18543.VXFS-BASE-KRN              Fri Aug 17 18:59:16 EDT 2001
# PHKL_18543.VXFS-PRG                   Fri Aug 17 18:59:16 EDT 2001