The widespread use of temporal aspects in user modeling indicates their importance, and their consideration showed to be highly effective in various domains related to user modeling, especially in recommender systems. Still, past and ongoing research, spread over several decades, provided multiple ad-hoc solutions, but no common understanding of the issue. There is no standardization and there is often little commonality in considering temporal aspects in different applications. This may ultimately lead to the problem that application developers define ad-hoc solutions for their problems at hand, sometimes missing or neglecting aspects that proved to be effective in similar cases. Therefore, a comprehensive survey of the consideration of temporal aspects in recommender systems is required. In this work, we provide an overview of various time-related aspects, categorize existing research, present a temporal abstraction and point to gaps that require future research. We anticipate this survey will become a reference point for researchers and practitioners alike when considering the potential application of temporal aspects in their personalized applications.

时间方面在用户建模中的广泛使用表明了它们的重要性，并且它们的考虑在与用户建模相关的各个领域中显示出非常有效，特别是在推荐系统中。尽管如此，过去和正在进行的研究，跨越了几十年，提供了多种临时解决方案，但对这个问题没有达成共识。没有标准化，在考虑不同应用程序中的时间方面通常很少有共同点。这可能最终导致应用程序开发人员为他们手头的问题定义临时解决方案的问题，有时会遗漏或忽略在类似情况下被证明有效的方面。因此，需要对推荐系统中时间方面的考虑进行全面调查。在这项工作中，我们概述了与时间相关的各个方面，对现有研究进行分类，提出时间抽象并指出需要未来研究的差距。我们预计这项调查将成为研究人员和从业人员在考虑时间方面在其个性化应用中的潜在应用时的参考点。