The day pillar for Tuesday, 15 September 2026

Day pillar	壬辰 (ren chen)
Heavenly stem	壬 (ren)
Earthly branch	辰 (chen)
Day element	Water 水 (shui)
Polarity	Yang
Month pillar	丁酉 (ding you), governed by 白露 (bailu)

Today's day pillar is 壬辰 (ren chen), a yang Water day in the sixty-day cycle. The month pillar is 丁酉 (ding you), governed by the term 白露 (bailu).

The late 子 hour, and where a day really begins

For a birth chart the day pillar changes at 23:00, when the 子 (zi) hour begins, and not at midnight.

The twelve earthly branches divide the day into two-hour periods, and 子 is the one straddling midnight, from 23:00 to 01:00. Because the branch begins at 23:00, the classical rule is that the day pillar rolls over then. A birth at 23:30 belongs to the following day pillar, which is a real and frequently mishandled boundary in chart work.

This site works differently on purpose. A daily page covers a whole calendar day, so there is no single clock moment for the rule to act on, and the day pillar shown here is the one for the civil day from midnight to midnight in your device's local time.

So if you are reading your own chart and were born late in the evening, check which convention was used. It is one of the few places where two competent practitioners can hand you two different charts.