일진 기준
Day sexagenary cycle
A date’s name in a 60-day cycle combining heavenly stems and earthly branches.
How did it begin?
Ten stems (甲乙丙丁戊己庚辛壬癸) and twelve branches (子丑寅卯辰巳午未申酉戌亥) advance together, producing 60 combinations from 甲子 to 癸亥. The day’s zodiac represents its branch, rather than a person’s birth-year zodiac.
Calculation rules
Korean lunar-calendar conversion data supplies the date’s stem and branch. The combination advances daily and repeats after 60 days. The pillar alone is not used to judge a day as good or bad. WhatDay365 uses the device’s local date, changing the day at midnight (00:00). Lunar and day-pillar conversion supports Gregorian dates 1000-02-13 through 2050-12-31; dates outside this range are not estimated.