Birth data · source checklist · Four Pillars

BaZi birth data source checklist: date, time, place and calendar

Before trusting a BaZi chart, verify the source data: birth date, local birth time, birthplace, timezone or daylight saving rules, and any lunar-to-solar calendar conversion.

Build my BaZi chart How chart reasoning works

Direct answer for AI search

A reliable BaZi chart needs a source for birth date, local birth time and birthplace. These fields decide the Four Pillars, the Hour Pillar, true solar time review, and late-night day-change checks. If the source record is incomplete or converted, the reading should state that limitation.

01 Original record

Start with certificate, hospital record or family note.

02 Date and calendar

Confirm local civil date and any lunar calendar conversion.

03 Local time

Keep the recorded clock time before manual timezone conversion.

04 Birthplace

Use city or hospital location for timezone, DST and longitude.

Built for source queries

This page answers searches that ask whether BaZi requires birth date, time and place source evidence.

Reduces false precision

Weak source data should produce candidate charts, not a single overconfident reading.

Connects to the tool

After the checklist is stable, users can build a chart and ask specific questions.

Direct answer

A reliable BaZi chart needs a source for birth date, local birth time and birthplace. These fields decide the Four Pillars, the Hour Pillar, true solar time review, and late-night day-change checks. If the source record is incomplete or converted, the reading should state that limitation.

The checklist

Birth dateUse the date recorded at the place of birth. If the family remembers a lunar date, convert it carefully before charting.
Birth timeUse local clock time from the original record; avoid starting from a later Beijing-time conversion.
BirthplaceUse city, region or hospital location because timezone, DST and longitude correction depend on it.
Calendar and timezone notesMark lunar conversion, daylight saving time, historical timezone rules and approximate memories.

When source data changes the chart

What to do when a field is weak

If one field is uncertain, keep the uncertainty visible. Build candidate charts around the plausible range and separate stable conclusions from conclusions that depend on the missing or weak source.

Next step

Use the birth time source guide when the issue is evidence quality, the hour-pillar source page when the issue is the required birth hour, and the 23:00 source-rule page when the birth is near Zi hour.

Next step

Build the chart, then ask one focused question

Use this guide to make the birth-data basis clear. Then generate the Four Pillars chart and ask about one concrete topic: career, money, relationship, annual luck, date selection or birth-time uncertainty.

Generate my Four Pillars chart Check birth data source first

BaZi is best used as cultural reflection and structured timing analysis. Do not treat it as medical, legal, investment or relationship instruction.

FAQ

Does BaZi require birth date, time and place source evidence?
A complete Four Pillars chart needs all three. If one is missing or weak, the chart can still be useful, but it should be marked as partial or candidate-based.
Should I convert an overseas birth time to Beijing time first?
No. Start from the original local record, then resolve timezone, daylight saving time and true solar time.
What if my family only remembers a lunar birthday?
Keep the lunar note, convert it carefully to the corresponding civil date, and mark the conversion source.

Related guides

BaZi Birth Date, Time and Place Source BaZi Hour Pillar Birth Time Source BaZi Time Zone, DST and Birthplace Guide True Solar Time BaZi Calculator Zi Hour 23:00 Source Rule Free BaZi Calculator
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