(beginning Asterisk 1.4)
Converts a formatted date and time string into a Unix timestamp.
; Save the date/time in the format YYYY-MM-DD HH:MM:SS in the variable ${time}:
exten => 123,1,Set(time=${STRFTIME(${EPOCH},America/Los_Angeles,"%Y-%m-%d %H:%M:%S")})
; Convert ${time} into Unix time:
exten => 123,n,Set(timestamp=${STRPTIME(${time}|America/Los_Angeles|%Y-%m-%d %H:%M:%S)} 


Internal help for this application in Asterisk 1.4:
  -= Info about function 'STRPTIME' =- 


Returns the epoch of the arbitrary date/time string structured as described in the format.

This is useful for converting a date into an EPOCH time, possibly to pass to
an application like SayUnixTime or to calculate the difference between two
date strings.

  ${STRPTIME(2006-03-01 07:30:35|America/Chicago|%Y-%m-%d %H:%M:%S)} returns 1141219835
diff output to internal help in Asterisk 1.2:
-- not available in Version 1.2 --