calculate the mean(middle) of points with the format dd:mm:ss.x

Namba Takaya <[email protected]>
Newsgroups gmane.comp.gis.gmt.user
Message-ID <[email protected]>
Dear Sir
I would like to calculate the mean(middle) of points such as polygon with the format dd:mm:ss.x by GMT command.
For example, this is data of longitudes as below and I wish to calculate the mean of all the longitudes by GMT.
04:14:36.004:23:33.604:34:52.504:14:27.004:14:10.5...............
regards,
takaya
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