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rating_with_timestamp.mat 

rating.mat includes the rating information with time points when ratings are created. The time points are splited into 11 timestamps. There are six columns and they are userid, productid, categoryid, rating, helpfulness and  time stamps respectively.

For example, for one row
(1,2,3,4,5, 6)

It means that user 1 gives a rating of 4 to the product 2 from the category 3. The helpfulness of this rating is 5 in the time stamp 6.




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epinion_trust_with_timestamp.mat

epinion_trust_with_timestamp.mat includes the trust relations between users with the time stamps when the relations were established. There are three columns: the first two columns are userid and the third column is timestamp .

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for example, for one row,
(1,2,3)

it means that user 1 trusts user 2 at timestamp 3.
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References
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@Conference{tang-etal12a,
  title={m{T}rust: {D}iscerning multi-faceted trust in a connected world},
  author={Tang, J. and Gao, H. and Liu, H.},
  booktitle={Proceedings of the fifth ACM international conference on Web search and data mining},
  pages={93--102},
  year={2012},
  organization={ACM}
}


@Confernce{tang-etal12b,
  title={e{T}rust: {U}nderstanding trust evolution in an online world},
  author={Tang, J.and Gao, H. and Liu, H.  and Das Sarma, A.},
  booktitle={Proceedings of the 18th ACM SIGKDD international conference on Knowledge discovery and data mining},
  pages={253--261},
  year={2012},
  organization={ACM}
}