Online resources have become more plentiful nowadays, thanks to the popularization of Internet services. In order to achieve accurate search results for the users, it is necessary to analyze web pages precisely. ‘Date’ is one of the most important fields of metadata in web pages. Due to the special date displaying formats using in Taiwan, it has made the automatic cataloging on date for webpage more difficult. The major purpose of this research is to thoroughly analyze different types of date displaying formats applied to Chinese web pages. These findings will be used to increase the precision on the date auto extraction of web pages. The procedures of experiment are as follows. Firstly, samples were randomly selected from Internet. Secondly, the statistic analysis on the date displaying format of each web pages was conducted. Lastly, Regular Expression was used to abstract the dates of each web page, while the accuracy ratio was also calculated. The difficulties and feasibility of auto date extraction are discussed in the end of this work. The results of the experiment suggest the accuracy ratio of web pages with date information is 61%. On the other hand, the accuracy ratio of web pages without date information is 62%. The average error of those web pages with date information is 0.62 year. The results of this research suggest that the auto date extraction mechanism can be used to improve the efficiency on webpage information retrieval.