Which Time Zone Should You Use When Casting I Ching Abroad?
Casting an I Ching hexagram abroad, the day stem-branch and the hour branch follow the local time zone where you toss the coins, not the time zone of your home country. This mirrors a rule long used in BaZi (Four Pillars) astrology for people born abroad, and the same logic applies to the moment a hexagram is cast.
The reason is straightforward: the day and hour stem-branch describe the energetic state of the exact physical moment you cast, and that moment is tied to the wall clock where you are standing, not to a clock on the other side of the world.
Why Do the Day and Hour Stem-Branch Matter in Six-Line I Ching?
The day stem-branch (often called the Day God, or Nhật thần) is one of the factors that decides the strength of the Useful God in a Six-Line reading, and it governs void and burial states too. The hour branch interacts directly with the lines through the Five Elements. Shift the day or the hour, the day stem-branch changes, and the whole strength reading shifts with it. See the full explanation in What Is the Day God and Month Command.
Why Not Just Use Your Home Country's Time When Casting Abroad?
The day and hour stem-branch record an event that happened at a specific place. Converting everything to your home country's time changes the recorded day and hour, because the gap between, say, Vietnam and the US, Europe or Australia is usually many hours, not minutes.
This is not a small difference. The day stem-branch shifting from the 5th to the 6th can change both the stem and the branch, which then changes the strength and void state of the Useful God. Two readings of the same hexagram would come out different.
How Does KinhDich.app Compute the Cast Time?
The system at KinhDich.app uses the local wall-clock time in the time zone where you cast, defaulting to your device's time zone, for both an in-app cast and a hexagram recorded from real coins afterward. If you cast in one place but record in another, tap "Change" to pick the correct date, time and time zone; the stem-branch preview updates immediately so you see exactly what will drive the reading before you commit. Daylight saving time for the chosen zone is handled automatically.
The day changes at 00:00 local wall-clock time in that zone, and the Rat hour spans 23:00 to 00:59. The stem-branch is computed once, at cast time, and saved with the hexagram, so it never shifts later no matter where or in what time zone you view it afterward.
Does the Solar-Term Month Change With Time Zone?
The month branch (Month Command) does not depend on time zone at all. A solar term is a single astronomical instant shared by the entire planet; every time zone simply displays that same instant in its own local clock, the instant itself never moves depending on where you stand. This is also not the lunar calendar month, it is a solar-term boundary.
Casting right at the moment a solar term turns over is the one edge case worth noticing: the month branch changes at that exact instant everywhere in the world, only the displayed local time of that instant differs by zone.
A Minority View: What Is True Solar Time?
Some BaZi practitioners use true solar time (apparent solar time), adding a further correction based on the exact longitude of the birthplace, since a location's standard time zone and its true solar time can differ by tens of minutes. This is a minority school, mostly applied to precise-birth-time BaZi charts, and practitioners have not fully agreed on how large the correction should be.
KinhDich.app does not apply this longitude correction for Six-Line I Ching casts, it uses standard local wall-clock time only. If you follow the true-solar-time school, treat the app's result as a standard-time reference point, not a true-solar-time one.
Cast Now, Record Later: Entering the Correct Cast Time
If you already tossed three real coins and only sit down to enter them later, pick the "Record" mode and tap "Change" on the cast-time line to enter the exact date, time and time zone of the actual toss, not the time you happen to be typing it in. A warning line appears if the time you pick sits right next to a solar-term boundary or right next to midnight, since that is exactly where one branch can silently shift without you noticing. See the full line-by-line steps in Recording a Six-Line Cast With Real Coins.
Cast Your Hexagram Online at KinhDich.app
No manual time-zone math or stem-branch lookup table needed. Open the online caster, the system reads your device's time zone automatically and computes the correct day stem-branch and hour branch, with the full reading across the primary, nuclear and derived hexagrams. New to the method itself? Start with What Is Liu Yao (Six Lines).
Frequently Asked Questions
When casting I Ching abroad, should the stem-branch follow my local time zone or my home country?
Follow the local time zone where you actually toss the coins. The day and hour stem-branch describe the physical moment of casting, and that moment is tied to the clock where you are standing, not to your home country.
Why can a time zone difference change the whole reading?
A large time zone gap can push the cast moment into a different day or a different two-hour branch, changing the day stem-branch. That stem-branch drives the strength and void state of the Useful God, so a shifted day usually shifts the direction of the reading too.
Does the solar-term month change when I cast abroad?
No. A solar term is a single astronomical instant shared worldwide; every time zone only displays that instant on its own local clock. The month branch does not depend on which country you are casting in.
I tossed real coins abroad and only entered them into the app that night, which time is correct?
The time and time zone of the actual toss, not the time you sat down to enter it. Pick Record mode, tap the time-change control, and set the exact date, time and time zone of when the coins were released.
How is true solar time different from the standard time zone this site uses?
True solar time adds a correction based on the exact longitude of the location, since standard time zones and true solar time can differ by tens of minutes. It is a minority approach used in some BaZi practice; KinhDich.app uses standard local wall-clock time without a longitude correction.
Does the app handle daylight saving time correctly for my country?
Yes. It reads local wall-clock time from the chosen IANA time zone, which already accounts for that zone's daylight saving rule at the exact cast moment, no manual adjustment needed.
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Apply what you just learned with a real hexagram.