BaZi Four Pillars

What BaZi Four Pillars does

Enter Gregorian date and time, choose late or early Zi-hour rule, and get year/month/day/hour stems and branches. Missing hour fails. Local calendar library, not an astrologer.

BaZi Four Pillars sits in the Date & time group on purpose. It is not Lunar ↔ Solar (Convert Gregorian and Chinese lunar dates.) and not Age Calculator (Years, months, and days from a birth date.). Choose this page when you need Four pillars from birth date and hour. If you stretch BaZi Four Pillars into a neighbor’s job, the result will look wrong even though the site chrome looks the same.

How to use BaZi Four Pillars

1. Confirm you need BaZi Four Pillars, not Lunar ↔ Solar (Convert Gregorian and Chinese lunar dates.). Address: /datetime/bazi.
2. Enter the numbers or dates BaZi Four Pillars uses. Four pillars from birth date and hour.
3. Read the result as BaZi Four Pillars defines it — not as Age Calculator (Years, months, and days from a birth date.). Enter Gregorian date and time, choose late or early Zi-hour rule, and get year/month/day/hour stems and branches. Missing hour fails. Local calendar library, not an astrologer.
4. BaZi Four Pillars is an estimate in the browser, not professional advice. Hour and minute required. Late or early Zi-hour.
5. Need a different formula? Try Age Calculator (Years, months, and days from a birth date.) instead of stretching BaZi Four Pillars.

When not to use BaZi Four Pillars

Skip BaZi Four Pillars when a neighbor tool matches better — start with Lunar ↔ Solar or Age Calculator — or when the description already warns the job will fail. In the tool’s own words: Enter Gregorian date and time, choose late or early Zi-hour rule, and get year/month/day/hour stems and branches. Missing hour fails. Local calendar library, not an astrologer.

Questions about BaZi Four Pillars

What does BaZi Four Pillars do that other Date & time pages on this site do not?

Enter Gregorian date and time, choose late or early Zi-hour rule, and get year/month/day/hour stems and branches. Missing hour fails. Local calendar library, not an astrologer. Short version: Four pillars from birth date and hour.

Does BaZi Four Pillars upload my file or text to Tool-You servers?

No. BaZi Four Pillars runs in this browser tab. Files stay on the device. Limit note: Hour and minute required. Late or early Zi-hour.

Should I use Lunar ↔ Solar instead of BaZi Four Pillars?

Use BaZi Four Pillars when you need Four pillars from birth date and hour. Use Lunar ↔ Solar when you need Convert Gregorian and Chinese lunar dates. They share a category (Date & time) but not the same job.

What are the limits of BaZi Four Pillars?

Hour and minute required. Late or early Zi-hour. Also: Enter Gregorian date and time, choose late or early Zi-hour rule, and get year/month/day/hour stems and branches. Missing hour fails. Local calendar library, not an astrologer.