Unlike English this, 這個/这个 is not used for units of time such as 年 (nián), 月 (yuè), and 日 (rì). Rather, 今 (jīn) is used. For example, 今晚 (jīnwǎn, “tonight”), ...
这个(zhège) currently has the following grammatical points associated with it: Name-calling with "zhege" (B2). Not what you're looking for? Check the wiki page ...