31. A computer program product comprising a computer-readable storage medium, for resolving ambiguities in date values associated with an attribute of an entity, the computer-readable storage medium comprising: program code for obtaining a first text string associated with an attribute of an entity, wherein the first text string is extracted from a first web document; program code for determining that the first text string conforms to one or more date formats; program code for assigning a first confidence value for each of the date formats for the first text string based on a first number of unknown variables that remain when interpreting the first text string using each of the date formats; program code for obtaining a second text string associated with the attribute of the entity, wherein the second text string is extracted from a second web document; program code for determining if that the second text string conforms to one or more of the date formats; program code for assigning a second confidence value for each of the date formats for the second text string based on a second number of unknown variables that remain when interpreting the second text string using each of the date formats; program code determining a first date string expressed in a date format with a highest first confidence value for the first text string; program code determining a second date string expressed in a date format with a highest second confidence value for the second text string; and program code for merging a first subset of the first date string and a second subset of the second date string to obtain a date value for the attribute.
31. A computer program product comprising a computer-readable storage medium, for resolving ambiguities in date values associated with an attribute of an entity, the computer-readable storage medium comprising: program code for obtaining a first text string associated with an attribute of an entity, wherein the first text string is extracted from a first web document; program code for determining that the first text string conforms to one or more date formats; program code for assigning a first confidence value for each of the date formats for the first text string based on a first number of unknown variables that remain when interpreting the first text string using each of the date formats; program code for obtaining a second text string associated with the attribute of the entity, wherein the second text string is extracted from a second web document; program code for determining if that the second text string conforms to one or more of the date formats; program code for assigning a second confidence value for each of the date formats for the second text string based on a second number of unknown variables that remain when interpreting the second text string using each of the date formats; program code determining a first date string expressed in a date format with a highest first confidence value for the first text string; program code determining a second date string expressed in a date format with a highest second confidence value for the second text string; and program code for merging a first subset of the first date string and a second subset of the second date string to obtain a date value for the attribute. 44. The computer program product of claim 31 , wherein one of the date formats is a United States date format.