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Added DateTime struct and method to split julian

feature/19
Daniel Warner 2011-05-01 23:58:33 +01:00
parent f4ed53c4e7
commit 3ecdfaec99
2 changed files with 42 additions and 0 deletions
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31
Julian.cpp
View File

@ -313,3 +313,34 @@ double Julian::ToGreenwichSiderealTime() const {
double Julian::ToLocalMeanSiderealTime(const double& lon) const {
return fmod(ToGreenwichSiderealTime() + lon, Globals::TWOPI());
}
void Julian::GetDateTime(struct DateTimeComponents* datetime) const {
double jdAdj = GetDate() + 0.5;
int Z = (int) jdAdj;
double F = jdAdj - Z;
int A = 0;
if (Z < 2299161) {
A = static_cast<int>(Z);
} else {
int a = static_cast<int>((Z - 1867216.25) / 36524.25);
A = static_cast<int>(Z + 1 + a - static_cast<int>(a / 4));
}
int B = A + 1524;
int C = static_cast<int>((B - 122.1) / 365.25);
int D = static_cast<int>(365.25 * C);
int E = static_cast<int>((B - D) / 30.6001);
datetime->hours = static_cast<int>(F * 24.0);
F -= datetime->hours / 24.0;
datetime->minutes = static_cast<int>(F * 1440.0);
F -= datetime->minutes / 1440.0;
datetime->seconds = F * 86400.0;
datetime->days = B - D - static_cast<int>(30.6001 * E);
datetime->months = E < 14 ? E - 1 : E - 13;
datetime->years = datetime->months > 2 ? C - 4716 : C - 4715;
}

11
Julian.h
View File

@ -32,6 +32,17 @@ public:
~Julian() {
};
struct DateTimeComponents {
int years;
int months;
int days;
int hours;
int minutes;
double seconds;
};
void GetDateTime(struct DateTimeComponents* datetime) const;
time_t ToTime() const;
double ToGreenwichSiderealTime() const;
double ToLocalMeanSiderealTime(const double& lon) const;