[myth-ie] faster dates for uk_rt grabber

[Justin Mason]

Brendan Kehoe writes:
> Do any of you have an opinion which of Date::DateCalc, Date::TimeDate, 
> or Time::Time (or something else) would prove to be more efficient than 
> UnixDate for the >30,000 calls made by tv_grab_uk_rt for a 14-day pull 
> of NTL/UPC's channel list?

I suspect a benchmark run might help ;)

What kind of input is it working on?  date strings, parsed into time_t
values?  Is it caching the results?

--j.