How to Use Ancient Chinese Time Calculator
The Ancient Chinese Time Calculator offers two conversion modes.
- Time → Shichen — Enter any 24-hour time in the input field. The Ancient Chinese Time Calculator immediately shows the matching Shichen name, its Earthly Branch, classical aliases, and precise Chu/Zheng subdivision.
- Shichen → Time — Select any Shichen from the dropdown to see the corresponding modern time range. The Ancient Chinese Time Calculator highlights that row in the reference table.
- Quick Reference Table — The built-in table lists all 12 Shichen with their time ranges and aliases. Click any row to jump to that Shichen in the Ancient Chinese Time Calculator.
Formula & Theory — Ancient Chinese Time Calculator
The Ancient Chinese Time Calculator is based on the classical Chinese timekeeping system:
1 day = 12 Shichen × 2 hours each
Shichen index = floor(hour / 2) [with Zi starting at 23:00]
Chu = first hour of Shichen (e.g. 11:00–11:59)
Zheng = second hour of Shichen (e.g. 12:00–12:59)
| Shichen | Branch | Modern Time | Common Alias |
|---|---|---|---|
| 子时 (Zi) | 子 | 23:00–00:59 | 夜半 / Midnight |
| 午时 (Wu) | 午 | 11:00–12:59 | 日中 / Midday |
| 卯时 (Mao) | 卯 | 05:00–06:59 | 日出 / Sunrise |
| 酉时 (You) | 酉 | 17:00–18:59 | 日入 / Sunset |
The Ancient Chinese Time Calculator covers all 12 Shichen with full aliases and subdivisions.
Use Cases for Ancient Chinese Time Calculator
The Ancient Chinese Time Calculator is useful in many contexts:
- Traditional culture enthusiasts wanting to tell time the classical Chinese way using the Ancient Chinese Time Calculator.
- Historical novel readers who encounter time references like "子时三刻" and need to understand what modern time that corresponds to.
- Writers and game designers creating historical or ancient-themed content who need accurate time period references from the Ancient Chinese Time Calculator.
- Students studying Chinese history, literature, or culture who need a quick reference for the 12 Shichen.
- Astrology and fortune-telling practitioners who use birth hour (时辰) for Chinese zodiac and Ba Zi (八字) analysis.
The Ancient Chinese Time Calculator makes classical Chinese timekeeping accessible and immediately understandable for modern users, bridging over 2,000 years of temporal tradition with a simple browser tool.