input.txt
1 date | value 2 2011-01-03 | 3 3 2011-01-03 | 2 4 2011-01-03 | 1 5 2011-01-03 | 1.2 6 2011-01-09 | 1 7 2012-01-11 | -1 8 2001-42-42 9 2012-01-11 | 1 10 2012-01-11 | 2147483648
1 date | value 2 2011-01-03 | 3 3 2011-01-03 | 2 4 2011-01-03 | 1 5 2011-01-03 | 1.2 6 2011-01-09 | 1 7 2012-01-11 | -1 8 2001-42-42 9 2012-01-11 | 1 10 2012-01-11 | 2147483648