90 lines
1.9 KiB
C++
90 lines
1.9 KiB
C++
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#include "JD.h"
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#include "const.h"
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#include <cstring>
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#include <cstdio>
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//https://github.com/guolisen/YiEngine/blob/2ce67dc91fd5fea8e394a5af60dc1e56c5044452/src/DateTime/JulianDay.cpp
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//公历转儒略日
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double JD::DD2JD(int y, uint8_t m, double d)
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{
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int n = 0, G = 0;
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//判断是否为格里高利历日1582*372+10*31+15
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if (y * 372 + m * 31 + (int)(d) >= 588829)
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{
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G = 1;
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}
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if (m <= 2)
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{
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m += 12, y--;
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}
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//加百年闰
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if (G)
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{
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n = int2(y / 100), n = 2 - n + int(n / 4);
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}
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return int2(365.25*(y + 4716)) + int2(30.6001*(m + 1)) + d + n - 1524.5;
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}
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//儒略日数转公历
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Time JD::JD2DD(double jd)
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{
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Time r;
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int D = int2(jd + 0.5);
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float F = jd + 0.5 - D, c; //取得日数的整数部份A及小数部分F
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if (D >= 2299161)
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{
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c = int((D - 1867216.25) / 36524.25), D += 1 + c - int2(c / 4);
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}
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D += 1524; r.Y = int2((D - 122.1) / 365.25);//年数
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D -= int2(365.25*r.Y); r.M = int2(D / 30.601); //月数
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D -= int2(30.601*r.M); r.D = D; //日数
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if (r.M > 13)
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{
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r.M -= 13, r.Y -= 4715;
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}
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else
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{
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r.M -= 1, r.Y -= 4716;
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}
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//日的小数转为时分秒
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F *= 24; r.h = int2(F); F -= r.h;
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F *= 60; r.m = int2(F); F -= r.m;
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F *= 60; r.s = F;
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return r;
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}
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double JD::toJD(Time& time)
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{
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return JD::DD2JD(time.Y, time.M, time.D + ((time.s / 60 + time.m) / 60 + time.h) / 24);
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}
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//提取jd中的时间(去除日期);
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std::string JD::timeStr(double jd)
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{
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int h, m, s;
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jd += 0.5; jd = (jd - int2(jd));
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s = int2(jd * 86400 + 0.5);
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h = int2(s / 3600); s -= h * 3600;
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m = int2(s / 60); s -= m * 60;
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std::string ret = "";
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char buff[11];
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memset(buff, 0, 11);
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std::snprintf(buff, sizeof(buff), "0%d", h);
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ret.append(buff + strlen(buff) - 2);
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ret += ":";
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memset(buff, 0, 11);
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std::snprintf(buff, sizeof(buff), "0%d", m);
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ret.append(buff + strlen(buff) - 2);
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ret += ":";
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memset(buff, 0, 11);
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std::snprintf(buff, sizeof(buff), "0%d", s);
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ret.append(buff + strlen(buff) - 2);
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return ret;
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}
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