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List Manipulation- Advanced beginner question


I am trying to add multiple lists together and am looking for some
guidance. My data is in the form of multiple time series, with dates
that overlap one another. I need to merge the lists, add all of the
values together  for the dates that overlap and output a single list
that only has one entry for each date.

For example, if I have three values for September 15 (8,14,10), I only
want a single entry for September 15 in the final list with a value of
32. The data is in standard date spec form: { {{Date 1}, Value 1},
{{Date 2}, Value 2},  {{Date 3}, Value 3}, ....... {{Date n}, Value
n}, }.


Thanks,

NVF




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