Early/Late Zi Hour

Early/Late Zi Hour

Early/Late Zi Hour

The early/late Zi hour refers to the period between 23:00-24:00, with different methods affecting the day stem and branch.

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What is Early/Late Zi Hour?

The Zi hour (子时) is the first of the twelve double-hours, corresponding to 23:00-01:00. Since it spans two days, it is divided into early Zi hour (23:00-24:00) and late Zi hour (00:00-01:00).

Two Methods for Calculating Zi Hour

There are two traditional views on which day the stem-branch belongs to for births between 23:00-24:00:

  • Method 1: Treat 23:00-24:00 as the next day
  • Method 2: Treat 23:00-24:00 as the current day (more common)

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