子时 · 23:00 至 00:59

The Rat hour, the hour of Zi (子时): the two hours of the clock it covers, from 23:00 to 00:59, and the element and hidden stems it gives the hour pillar.

子时跨午夜：晚子时算哪一天 The Zi hour crosses midnight: which day does a late Zi birth belong to?

子时是唯一横跨午夜的时辰。23:00–23:59 称晚子时，00:00–00:59 称早子时。晚子时出生的人，日柱算哪一天，有两种做法：

子时起算次日，是把子时当作一天的开始；晚子时算当天，是以午夜换日。两派都有传承，排出来的日柱差一天。本站默认晚子时算当天：日柱不变，时干按次日推。想按子时起算次日排，可以在流派设置里改。

The Zi hour is the only one that crosses midnight. 23:00 to 23:59 is the late Zi hour, and 00:00 to 00:59 is the early Zi hour. For a birth in the late Zi hour, the schools disagree on which day it belongs to. One school treats the Zi hour as the start of a new day. The other changes the day at midnight. Both have a long tradition, and the day pillars they give are one day apart. This site's default keeps the late Zi hour on the day of birth: the day pillar stays the same, and only the hour stem is taken from the next day. To use the other school, change it on the Conventions page.

关于时辰的两个提醒 Two things to know about the hours

一、时辰应以真太阳时计算，不是手表时间。新加坡现在用 UTC+8，钟表以东经 120° 为准，但新加坡地处东经约 104°，真太阳时比钟表慢约 65 分钟。1982 年以前，新加坡的钟表多为 UTC+7:30，那时约慢 35 分钟（1930–1932 年为 UTC+7，1933 年至 1941 年 8 月为 UTC+7:20，1942 年 2 月至 1945 年 9 月为 UTC+9）。另有均时差，全年在约 -14 至 +16 分钟之间。出生在时辰交界前后的人，可能因此差出一个时辰。在排盘里输入出生城市，会按出生当天的时区与均时差自动换算。

First, count the hours in true solar time, the time by the sun at the place of birth, not by the clock. Singapore uses UTC+8 today, which is set for longitude 120° east, but Singapore lies at about 104° east, so true solar time runs about 65 minutes behind the clock. Before 1982, Singapore's clocks were mostly on UTC+7:30, and true solar time then ran about 35 minutes behind the clock (a few shorter periods used other offsets). On top of that, the sun runs a little early or late through the year, by about -14 to +16 minutes (the equation of time). If you were born near the boundary of two hours, this can put you in a different hour altogether. Enter your city of birth on the chart form, and the form converts your clock time into true solar time, using the time zone and the equation of time for your date of birth.

二、时辰不确定时，宁可标明不确定，也不要猜。时柱影响子女宫与晚年运，猜错会带偏整张盘。

Second, if you are not sure of the hour, say so rather than guess. The hour pillar bears on children and on later life, and a wrong guess pulls the whole chart off course.

十二时辰 All twelve hours

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