What if your BaZi birth time is unknown?

Keep the original date visible

Write down the date exactly as it appears in your record. Include the year, the month written as a word, and the day. “6 September 1992” is easier to interpret across countries than “06/09/1992.” This example is a format, not a sample reading.

Also note which calendar the record uses. If a family record gives a Chinese lunar date, preserve that original date alongside any conversion. Do not silently relabel a lunar date as a Gregorian one. The Hong Kong Observatory publishes Gregorian–lunar conversion tables; record which table or tool you used so a conversion can be checked later.

If two records disagree, keep both versions and their sources. Choosing the date that produces a more flattering reading does not resolve the discrepancy.

Distinguish a recorded time from a memory

For a recorded time, keep the hour and minute and state whether the clock uses a 12-hour or 24-hour format. For a family recollection, use the words you were given: “around sunrise,” “before lunch,” or “about nine in the evening.” Do not turn those phrases into an exact minute.

If a record says 09:00 but a relative remembers a different time, mark the disagreement. Rounding, transcription and memory are questions to investigate, rather than reasons to present one version as certain.

If the hour is unknown, say so. Do not enter noon merely to make a required field disappear. Before using a calculator or ordering a reading, check how that service handles missing time. Any example based on an assumed hour should identify the assumption and explain which conclusions depend on it.

Record the place as well as the clock

Keep the birth city and country with the date and time. A time-zone abbreviation by itself is not a complete location. If the place name has changed, retaining the name from the original record can help someone investigate the historical context.

Do not subtract an hour for daylight saving or apply today’s UTC offset unless the calculation method explicitly requires you to do that. The IANA Time Zone Database records historical local-time rules, including changes to offsets and daylight saving. A date and location give software the context needed to select an applicable rule; a manually altered clock time can hide how the original record was interpreted.

Keep the original local clock time and any adjusted value in separate fields. Label the method used for an adjustment. This makes a calculation easier to reproduce without treating different conventions as interchangeable.

Ask what the calculation actually assumes

Two outputs are difficult to compare when their inputs and conventions are hidden. Before comparing interpretations, compare the underlying birth data, the time-zone handling and the stated calendar convention. Ask whether the tool used the recorded clock time directly or applied a further correction.

The current DI TIAN SUI preview uses the supplied local civil time and does not apply true-solar-time correction. Keep that boundary in mind when comparing it with a tool that states a different method. Our Four Pillars introduction separates the calculation layer from the traditional interpretation that follows it.

A note you can prepare before a reading

• Date, with the month written out and the calendar identified.
• Time exactly as recorded, or a clear statement that it is approximate or unknown.
• Birth city and country.
• The source of each detail: a record, a family account, or an estimate.
• Any disagreement between sources and any conversion already performed.

You can prepare this note without inventing missing information. Supply the details a service actually needs; there is no need to publish a full identity document as part of a chart discussion.