Don't Know Your Birth Time? What Saju Can Still Read
Many people were never told their birth hour, or only roughly. That is far less of a problem in Saju than people fear.
What the date alone gives you
| From birth date only | Needs the hour |
|---|---|
| Day Master and its strength (mostly) | Final strength judgement (the hour can tip a borderline chart) |
| Year and month pillars; the season of the chart | Hour pillar: the “children / later life / inner ambition” palace |
| Six of the eight characters and their Ten Gods | The last two characters' Ten Gods |
| Ten-year luck cycles (대운) and yearly luck (세운) | Fine-tuning of the luck cycle start age |
| Compatibility basics (Day Master and day branch) | Hour-branch harmonies in compatibility |
Experienced readers will tell you that the date gives roughly three-quarters of a reading. The hour pillar is the last quarter — valuable, but not the foundation.
The two-hour blocks
Saju does not need the minute. Hours are grouped into twelve two-hour branches: 子 (23:00–01:00), 丑 (01:00–03:00), 寅 (03:00–05:00) and so on. If you know you were born “early in the morning before sunrise”, that already narrows it to two or three blocks. Note that the 子 hour spans midnight, so classical practice treats a 23:30 birth as belonging to the next day — a detail a good calculator handles for you.
How to narrow it down
- Ask for the hospital record. Birth certificates in many countries record the time; Korean 출생증명서 almost always do.
- Ask relatives for context, not the clock: “before breakfast”, “during the evening news”, “the nurse had just changed shift” — each converts to a block.
- Daylight saving time. If you were born during DST, subtract an hour to get standard time before choosing the block. (Korea used DST in 1948–1960 and 1987–1988.)
- Rectification: some readers test candidate hours against known life events. This is interpretive, not exact; treat the result as a best guess.
What an honest reading looks like
A reading that does not know your hour should say so and read the three pillars, not quietly assume noon. At LotusSaju, choosing “I don't know my birth time” removes the hour pillar from the calculation rather than inventing one; the balance, Day Master and luck cycles are computed from what is actually known. If you later learn the hour, the reading can be redone.
See your own Four Pillars chart
Enter your birth date (and time, if you know it). The free reading shows your Day Master, element balance and lucky element in about a minute.
Get my free reading →Frequently asked questions
Can I get a Saju reading without my birth time?
Yes. The year, month and day pillars are enough for the Day Master, element balance, Ten Gods and luck cycles. You lose the hour pillar's detail on children and later life.
Should I just enter 12:00 if I don't know?
No. A noon birth is a specific hour pillar (午) and will add characters that may not be yours. Choose the “unknown” option so the calculator reads three pillars honestly.
Does daylight saving time affect my Saju?
Yes. Convert to standard time first. Korea observed DST in 1948–1960 and 1987–1988; many other countries observe it today.
Is a birth at 23:30 the same day or the next?
In classical Four Pillars the day begins at the 子 hour (23:00), so 23:30 is read as the next day's pillar. Some modern schools split the hour at midnight. A reliable calculator states which convention it uses.