julian_conversions.hpp File Reference

Julian Date / MJD / JDN helpers using the proleptic Gregorian calendar. More...

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Namespaces
namespace	time_shield
	Main namespace for the Time Shield library.
namespace	time_shield::detail

Functions
jd_t	time_shield::detail::gregorian_dmy_to_jd_unchecked (double day, int64_t month, int64_t year) noexcept
jdn_t	time_shield::detail::gregorian_dmy_to_jdn_unchecked (int64_t day, int64_t month, int64_t year) noexcept
double	time_shield::detail::day_fraction_from_hms (int hour, int minute, int second, int millisecond) noexcept
jd_t	time_shield::fts_to_jd (fts_t ts) noexcept
	Convert Unix timestamp (floating seconds) to Julian Date (JD).
jd_t	time_shield::ts_to_jd (ts_t ts) noexcept
	Convert Unix timestamp (seconds) to Julian Date (JD).
jd_t	time_shield::gregorian_to_jd (double day, int64_t month, int64_t year) noexcept
	Convert Gregorian date (with optional fractional day) to Julian Date (JD).
jd_t	time_shield::gregorian_to_jd (uint32_t day, uint32_t month, uint32_t year, uint32_t hour, uint32_t minute, uint32_t second=0, uint32_t millisecond=0) noexcept
	Convert Gregorian date/time components to Julian Date (JD).
jd_t	time_shield::gregorian_ymd_to_jd (year_t year, int month, int day, int hour=0, int minute=0, int second=0, int millisecond=0) noexcept
	Convert Gregorian date/time components to Julian Date (JD) using year-first order.
mjd_t	time_shield::fts_to_mjd (fts_t ts) noexcept
	Convert Unix timestamp (floating seconds) to Modified Julian Date (MJD).
mjd_t	time_shield::ts_to_mjd (ts_t ts) noexcept
	Convert Unix timestamp (seconds) to Modified Julian Date (MJD).
jdn_t	time_shield::gregorian_to_jdn (uint32_t day, uint32_t month, uint32_t year) noexcept
	Convert Gregorian date to Julian Day Number (JDN).
jdn_t	time_shield::gregorian_ymd_to_jdn (year_t year, int month, int day) noexcept
	Convert Gregorian date to Julian Day Number (JDN) using year-first order.
bool	time_shield::try_gregorian_ymd_to_jd (year_t year, int month, int day, int hour, int minute, int second, int millisecond, jd_t &out) noexcept
	Try converting Gregorian date/time components to Julian Date (JD) using year-first order.
bool	time_shield::try_gregorian_ymd_to_jdn (year_t year, int month, int day, jdn_t &out) noexcept
	Try converting Gregorian date to Julian Day Number (JDN) using year-first order.

Detailed Description

Julian Date / MJD / JDN helpers using the proleptic Gregorian calendar.

JD epoch used here:

• Unix epoch (1970-01-01 00:00:00 UTC) is JD 2440587.5

Notes:

• JD and MJD are returned as double (jd_t/mjd_t).
• These functions are intended for utility/analytics, not for high-precision astronomy.
• Legacy gregorian_to_* overloads use day, month, year order for compatibility.

Definition in file julian_conversions.hpp.