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Calendar basicsTraditional culture

Four Pillars inputs: from birth records to calendar boundaries

Compiled by the Space Between editorial team4 min readContent library updated
Four ink pillars beside a clock and calendar Enlarge diagram

Four ink pillars beside a clock and calendar

Original Space Between diagram. Lines explain spatial or rule relationships; see the article for the conditions.

Trace each pillar to its inputs and check time zone, leap month, solar month and day boundary before interpreting a chart.

Four Pillars records a time as four stem-branch pairs for year, month, day and hour. Their neat appearance hides different conversions. Without a known time or boundary convention, a complete chart may merely reflect defaults.

Inputs must contain more than eight characters

Keep the original date, time, birthplace, calendar and applicable time zone; lunar input needs a leap-month flag. Accepted input is not necessarily unambiguous. Mark oral recollections as approximate, and flag uncertainty about historical daylight saving, local timekeeping or conversion versions.

Year and month pillars are not copied from the civil calendar

Some Four Pillars traditions change the year at Start of Spring and the month at twelve jie. These are not 1 January, civil month starts or lunar new moons. After finding the month branch, derive its stem from the year stem. Renaming civil months with branches is insufficient; check the source’s convention.

The day boundary can also change the hour stem

The twelve double-hours commonly place Zi at 23:00–01:00. The start of Zi and a stem-branch day boundary are not identical in every school: conventions use 23:00, distinguish early/late Zi, or handle midnight separately. Since the hour stem depends on the day stem, a boundary change can affect both pillars.

Verify one conversion step at a time

In the Observatory’s table 4, Yin month of a Jia or Ji year takes Bing, giving Bing-Yin. Table 5 gives Jia-Zi for Zi hour on a Jia or Ji day. The first uses the year stem; the second uses the day stem. These check table lookup, not a complete personal chart without a full date.

Do not present defaults as birth facts

Keep unknown times blank or show a range. Any apparent-solar-time correction needs a stated basis and the original civil time retained. Do not adjust inputs to obtain a preferred interpretation. Four Pillars can index historical texts; consistent calculation is not reliable evidence about health, career or relationships.

Sources and further reading

These sources help clarify the concepts and their origins. Explaining a traditional term does not establish that it can predict outcomes.