What sign and year pillar is 1931? The year turns at 立春, not at New Year — here is the exact boundary.
辛未
年柱 Year pillar · 辛 阴金 (Metal) · 地支 未
生肖 羊 · Goat五行 Metal立春 1931-02-05农历新年 1931-02-17
八字以二十四节气定年月。一年的分界是 立春，1931 年的立春是 1931-02-05。很多排盘工具用元旦或农历新年换年柱，这会让年初出生的人整张命盘算错。
| 出生日期 Birth date | 年柱 Year pillar | 生肖 Zodiac |
|---|---|---|
| 1931-01-01 → 1931-02-05（立春前） | 庚午 | 马 Horse |
| 1931-02-05（立春后）→ 年底 | 辛未 | 羊 Goat |
If you were born in January or early February of 1931, you very likely belong to the previous year pillar (庚午). This is the single most common error in free BaZi calculators.
| 节气 | 日期 | 节气 | 日期 |
|---|---|---|---|
| 小寒 | 1931-01-06 | 大寒 | 1931-01-21 |
| 立春 | 1931-02-05 | 雨水 | 1931-02-19 |
| 惊蛰 | 1931-03-06 | 春分 | 1931-03-21 |
| 清明 | 1931-04-06 | 谷雨 | 1931-04-21 |
| 立夏 | 1931-05-06 | 小满 | 1931-05-22 |
| 芒种 | 1931-06-07 | 夏至 | 1931-06-22 |
| 小暑 | 1931-07-08 | 大暑 | 1931-07-24 |
| 立秋 | 1931-08-08 | 处暑 | 1931-08-24 |
| 白露 | 1931-09-08 | 秋分 | 1931-09-24 |
| 寒露 | 1931-10-09 | 霜降 | 1931-10-24 |
| 立冬 | 1931-11-08 | 小雪 | 1931-11-23 |
| 大雪 | 1931-12-08 | 冬至 | 1931-12-23 |
节气日期为北京时间（UTC+8）民用日。Solar-term dates are Beijing civil dates.
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