Get date of Portfile

[Scott Haneda]

How can I get the date that the portfile was last updated? Looking at some ports, many do not have livecheck, so I want to know if it is current.  I am surprised, but there are many a site that make it pretty darn hard to find out what is their current release version.

If I can tell if the Portfile is 12 months old, I know I should look into reving it.
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