v={'12:57:33' '36.6' '0.857101'
'12:57:51' '37.0' '0.891594'
'12:58:37' '37.7' '0.898841'
'12:59:49' '38.8' '0.893043'}
out=[datenum(v(:,1)) str2double(v(:,2:3))]
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