Importing data w/ Unix timestamp

I want to copy in some data from a tab-delimited flat file, but one of the
columns that should translate into a datetime is in Unix timestamp format
(seconds since epoch).

The data should go into this table:
create table logins (
uname varchar(100),
timein datetime,
duration int,
cid varchar(20),
natip varchar(20)
);

But it looks like this in the comma-delimited flatfile:

bob 957974401 17 8325824 210.16.68.250
james 957974401 13 3737270 210.16.68.250
edwin 957974402 201 3672136 210.16.68.250
steph 957974404 25 9398998 210.16.68.250
mitch 957974406 7 7221757 210.16.68.250

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