晚上子（鼠）時(shí)是十一到一點(diǎn),以十二點(diǎn)為正點(diǎn)；丑（牛）時(shí)是一點(diǎn)到三點(diǎn),以兩點(diǎn)為正點(diǎn)；寅（虎）時(shí)是三點(diǎn)到五點(diǎn),以四點(diǎn)為正點(diǎn)；卯（兔）時(shí)是五點(diǎn)到七點(diǎn),以六點(diǎn)為正點(diǎn)；辰（龍）時(shí)是七點(diǎn)到九點(diǎn),以八點(diǎn)為正點(diǎn)；巳（蛇）時(shí)是九點(diǎn)到十一點(diǎn),以十點(diǎn)為正點(diǎn)；午（馬）時(shí)是十一點(diǎn)到一點(diǎn),以十二點(diǎn)為正點(diǎn)；未（羊）時(shí)是一點(diǎn)到三點(diǎn),以兩點(diǎn)為正點(diǎn)；申（猴）時(shí)是三點(diǎn)到五點(diǎn),以四點(diǎn)為正點(diǎn)；酉（雞）時(shí)是五點(diǎn)到七點(diǎn),以六點(diǎn)為正點(diǎn)；戌（狗）時(shí)是七點(diǎn)到九點(diǎn),以八點(diǎn)為正點(diǎn)；亥（豬）時(shí)是九點(diǎn)到十一點(diǎn),以十點(diǎn)為正點(diǎn).
因此晚上八點(diǎn)是戌時(shí)正點(diǎn).