一个简单的日历(java和android通用)

package com.example.calendar; import java.util.Calendar; /** * @author lxslove * @mail moodlxs@163.com * * @see http://www.doc88.com/p-211656359926.html 原理，http://www.fjptsz.com/xxjs/xjw/rj/115.htm web版 */ public class SolarTerm { // ========角度变换=============== private static final double rad = 180 * 3600 / Math.PI; // 每弧度的角秒数 private static final double RAD = 180 / Math.PI; // 每弧度的角度数 // ================日历计算=============== private static final double J2000 = 2451545; // 2000年前儒略日数(2000-1-1 12:00:00格林威治平时) // =========黄赤交角及黄赤坐标变换=========== private static final double hcjjB[] = { 84381.448, -46.8150, -0.00059, 0.001813 };// 黄赤交角系数表 private static final double preceB[] = { 0, 50287.92262, 111.24406, 0.07699, -0.23479, -0.00178, 0.00018, 0.00001 };// Date黄道上的岁差p private double Y = 2000; private double M = 1; private double D = 1; private double h = 12; private double m = 0; private double s = 0; private static final double[] dts = { // 世界时与原子时之差计算表 -4000, 108371.7, -13036.80, 392.000, 0.0000, -500, 17201.0, -627.82, 16.170, -0.3413, -150, 12200.6, -346.41, 5.403, -0.1593, 150, 9113.8, -328.13, -1.647, 0.0377, 500, 5707.5, -391.41, 0.915, 0.3145, 900, 2203.4, -283.45, 13.034, -0.1778, 1300, 490.1, -57.35, 2.085, -0.0072, 1600, 120.0, -9.81, -1.532, 0.1403, 1700, 10.2, -0.91, 0.510, -0.0370, 1800, 13.4, -0.72, 0.202, -0.0193, 1830, 7.8, -1.81, 0.416, -0.0247, 1860, 8.3, -0.13, -0.406, 0.0292, 1880, -5.4, 0.32, -0.183, 0.0173, 1900, -2.3, 2.06, 0.169, -0.0135, 1920, 21.2, 1.69, -0.304, 0.0167, 1940, 24.2, 1.22, -0.064, 0.0031, 1960, 33.2, 0.51, 0.231, -0.0109, 1980, 51.0, 1.29, -0.026, 0.0032, 2000, 64.7, -1.66, 5.224, -0.2905, 2150, 279.4, 732.95, 429.579, 0.0158, 6000 }; // 取整数部分 public static double int2(double v) { v = Math.floor(v); if (v < 0) return v + 1; return v; } // 对超过0-2PI的角度转为0-2PI public static double rad2mrad(double v) { v = v % (2 * Math.PI); if (v < 0) return v + 2 * Math.PI; return v; } // 计算世界时与原子时之差,传入年 public double deltatT(double y) { int i = 0; for (i = 0; i < 100; i += 5) if (y < dts[i + 5] || i == 95) break; double t1 = (y - dts[i]) / (dts[i + 5] - dts[i]) * 10; double t2 = t1 * t1; double t3 = t2 * t1; return dts[i + 1] + dts[i + 2] * t1 + dts[i + 3] * t2 + dts[i + 4] * t3; } // 传入儒略日(J2000起算),计算UTC与原子时的差(单位:日) public double deltatT2(double jd) { return this.deltatT(jd / 365.2425 + 2000) / 86400.0; } // 公历转儒略日,UTC=1表示原日期是UTC public double toJD(boolean UTC) { double y = this.Y; // 取出年月 double m = this.M; double n = 0; if (m <= 2) { m += 12; y--; } if (this.Y * 372 + this.M * 31 + this.D >= 588829) { // 判断是否为格里高利历日1582*372+10*31+15 n = int2(y / 100); n = 2 - n + int2(n / 4);// 加百年闰 } n += int2(365.2500001 * (y + 4716)); // 加上年引起的偏移日数 n += int2(30.6 * (m + 1)) + this.D; // 加上月引起的偏移日数及日偏移数 n += ((this.s / 60 + this.m) / 60 + this.h) / 24 - 1524.5; if (UTC) return n + this.deltatT2(n - J2000); return n; } // 儒略日数转公历,UTC=1表示目标公历是UTC public void setFromJD(double jd, boolean UTC) { if (UTC) jd -= this.deltatT2(jd - J2000); jd += 0.5; // 取得日数的整数部份A及小数部分F double A = int2(jd); double F = jd - A; double D; if (A > 2299161) { D = int2((A - 1867216.25) / 36524.25); A += 1 + D - int2(D / 4); } A += 1524; // 向前移4年零2个月 this.Y = int2((A - 122.1) / 365.25);// 年 D = A - int2(365.25 * this.Y); // 去除整年日数后余下日数 this.M = int2(D / 30.6001); // 月数 this.D = D - int2(this.M * 30.6001);// 去除整月日数后余下日数 this.Y -= 4716; this.M--; if (this.M > 12) this.M -= 12; if (this.M <= 2) this.Y++; // 日的小数转为时分秒 F *= 24; this.h = int2(F); F -= this.h; F *= 60; this.m = int2(F); F -= this.m; F *= 60; this.s = F; } // 设置时间,参数例:"20000101 120000"或"20000101" public void setFromStr(String s) { this.Y = Double.parseDouble(s.substring(0, 4)); this.M = Double.parseDouble(s.substring(4, 2)); this.D = Double.parseDouble(s.substring(6, 2)); this.h = Double.parseDouble(s.substring(9, 2)); this.m = Double.parseDouble(s.substring(11, 2)); this.s = Double.parseDouble(s.substring(13, 2)); /* 将5改为了2 */ } // 日期转为串 public String toStr() { String Y = " " + (int) this.Y; String M = "0" + (int) this.M; String D = "0" + (int) this.D; double h = this.h, m = this.m, s = Math.floor(this.s + .5); if (s >= 60) { s -= 60; m++; } if (m >= 60) { m -= 60; h++; } String sh = "0" + (int) h, sm = "0" + (int) m, ss = "0" + (int) s; Y = Y.substring(Y.length() - 5, Y.length()); M = M.substring(M.length() - 2, M.length()); D = D.substring(D.length() - 2, D.length()); sh = sh.substring(sh.length() - 2, sh.length()); sm = sm.substring(sm.length() - 2, sm.length()); ss = ss.substring(ss.length() - 2, ss.length()); return Y + "-" + M + "-" + D + " " + sh + ":" + sm + ":" + ss; } // 算出:jd转到当地UTC后,UTC日数的整数部分或小数部分 // 基于J2000力学时jd的起算点是12:00:00时,所以跳日时刻发生在12:00:00,这与日历计算发生矛盾 // 把jd改正为00:00:00起算,这样儒略日的跳日动作就与日期的跳日同步 // 改正方法为jd=jd+0.5-deltatT+shiqu/24 // 把儒略日的起点移动-0.5(即前移12小时) // 式中shiqu是时区,北京的起算点是-8小时,shiqu取8 public double Dint_dec(double jd, int shiqu, boolean dec) { double u = jd + 0.5 - this.deltatT2(jd) + shiqu / 24; if (dec) return Math.floor(u); // 返回整数部分 else return u - Math.floor(u); // 返回小数部分 } // 计算两个日期的相差的天数,输入字串格式日期,如:"20080101" double d1_d2(String d1, String d2) { double Y = this.Y, M = this.M, D = this.D, h = this.h, m = this.m, s = this.s; // 备份原来的数据 this.setFromStr(d1.substring(0, 8) + " 120000"); double jd1 = this.toJD(false); this.setFromStr(d2.substring(0, 8) + " 120000"); double jd2 = this.toJD(false); this.Y = Y; this.M = M; this.D = D; this.h = h; this.m = m; this.s = s; // 还原 if (jd1 > jd2) return Math.floor(jd1 - jd2 + .0001); else return -Math.floor(jd2 - jd1 + .0001); } // 返回黄赤交角(常规精度),短期精度很高 public static double hcjj1(double t) { double t1 = t / 36525; double t2 = t1 * t1; double t3 = t2 * t1; return (hcjjB[0] + hcjjB[1] * t1 + hcjjB[2] * t2 + hcjjB[3] * t3) / rad; } // 黄赤转换(黄赤坐标旋转) public static void HCconv(double[] JW, double E) { // 黄道赤道坐标变换,赤到黄E取负 double HJ = rad2mrad(JW[0]), HW = JW[1]; double sinE = Math.sin(E), cosE = Math.cos(E); double sinW = cosE * Math.sin(HW) + sinE * Math.cos(HW) * Math.sin(HJ); double J = Math.atan2(Math.sin(HJ) * cosE - Math.tan(HW) * sinE, Math.cos(HJ)); JW[0] = rad2mrad(J); JW[1] = Math.asin(sinW); } // 补岁差 public static void addPrece(double jd, double[] zb) { int i; double t = 1, v = 0, t1 = jd / 365250; for (i = 1; i < 8; i++) { t *= t1; v += preceB[i] * t; } zb[0] = rad2mrad(zb[0] + (v + 2.9965 * t1) / rad); } // ===============光行差================== private static final double GXC_e[] = { 0.016708634, -0.000042037, -0.0000001267 }; // 离心率 private static final double GXC_p[] = { 102.93735 / RAD, 1.71946 / RAD, 0.00046 / RAD }; // 近点 private static final double GXC_l[] = { 280.4664567 / RAD, 36000.76982779 / RAD, 0.000