46. A computer-implemented method for resolving ambiguities in date values associated with an attribute of an entity, the method comprising: identifying a plurality of web documents associated with an attribute of an entity; for each web document in the plurality of web documents, obtaining, from the web document, one or more text strings associated with the attribute of the entity; identifying one or more date formats for at least one of the one or more text strings; and assigning confidence values to each of the one or more date formats for the at least one of the one or more text strings based on a number of unknown variables that remain when interpreting the at least one of the one or more text strings using each of the one or more date formats; determining date strings expressed in date formats with highest confidence values for the at least one of the one or more text strings; and merging subsets of the date strings to obtain a date value for the attribute.
46. A computer-implemented method for resolving ambiguities in date values associated with an attribute of an entity, the method comprising: identifying a plurality of web documents associated with an attribute of an entity; for each web document in the plurality of web documents, obtaining, from the web document, one or more text strings associated with the attribute of the entity; identifying one or more date formats for at least one of the one or more text strings; and assigning confidence values to each of the one or more date formats for the at least one of the one or more text strings based on a number of unknown variables that remain when interpreting the at least one of the one or more text strings using each of the one or more date formats; determining date strings expressed in date formats with highest confidence values for the at least one of the one or more text strings; and merging subsets of the date strings to obtain a date value for the attribute. 47. The method of claim 46 , wherein the confidence value for a respective date format is further based on an amount of specificity of the respective date format, the amount of specificity of the respective date format being selected from the group consisting of: a number of unknown variables in the respective date format; a precision of the respective date format.