shell script to parse html and date comp ?

I would like to fetch date/time from html file, and use date comparison
and make an ics/vcal file eventually

the date comes as so:

<tr><td colspan="1" rowspan="1">Start Date Time: </td><td colspan="1"
rowspan="1">20/03/2014 1400 Thursday</td></tr>

is 'grep -o' the way to go ? what regex do I need where I put ???? ?

grep -o '<tr><td colspan="1" rowspan="1">Start Date Time: </td><td
colspan="1" rowspan="1">????</td></tr>'

?

what do I need to do with date to be able to compare it to a date range?

thanks for any pointers

Voytek

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