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use crate::{
Dt, Epoch, JD_2000_2_451_545, SEC_PER_DAY_I64, an_err,
error::{DtErr, DtErrKind},
utc::IsLeapSec,
{Meridiem, Offset, Parts, Weekday},
};
impl Parts {
/// Converts [`Parts`] → [`Dt`].
/// - Resulting [`Dt`] is on the TAI timescale having been converted from
/// this [`Parts`]'s `scale` field. See [`Scale`](enum.Scale.html).
/// - If this [`Parts`] time scale is `TAI` then no conversion is performed.
/// - If this [`Parts`] has a timestamp then it is used to create the [`Dt`]
/// and all other fields are ignored.
pub fn to_dt(&self) -> Result<Dt, DtErr> {
// ──────────────────────────────────────────────────────────────
// Explicit timestamp (%s or %J)
// ──────────────────────────────────────────────────────────────
if let Some(ts) = &self.timestamp {
match ts.epoch {
Epoch::Unix => {
let unix = Dt::new(ts.attos, self.scale, self.scale);
return Ok(Dt::from_unix(unix));
}
Epoch::Noon2000 => return Ok(Dt::from_attos(ts.attos, self.scale)),
}
}
// ──────────────────────────────────────────────────────────────
// Civil date path
// ──────────────────────────────────────────────────────────────
let mut jd: Option<i64> = None;
// Most common case first: Classic YMD
if let (Some(year), Some(m), Some(d)) = (self.yr, self.mo, self.day) {
if !Dt::is_valid_ymd(year, m, d) {
return Err(an_err!(DtErrKind::InvalidDate));
}
jd = Some(Dt::ymd_to_jd(year, m, d));
}
// Ordinal date (%j)
else if let (Some(year), Some(doy)) = (self.yr, self.day_of_yr) {
if doy == 0 || doy > 366 || (doy == 366 && !Dt::is_leap_yr(year)) {
return Err(an_err!(DtErrKind::DayOfYearOutOfRange));
}
jd = Some(Dt::ydoy_to_jd(year, doy));
}
// ISO week date (%G/%V)
else if let (Some(iso_y), Some(iso_w)) = (self.iso_wk_yr, self.iso_wk) {
if iso_w == 0 || iso_w > 53 {
return Err(an_err!(DtErrKind::IsoWeekOutOfRange));
}
if iso_w == 53 && !Dt::has_iso_wk_53(iso_y) {
return Err(an_err!(DtErrKind::InvalidIsoWeek));
}
let wd = self.wkday.unwrap_or(Weekday::Monday);
jd = Some(Dt::iso_wk_to_jd(iso_y, iso_w, wd));
}
// Sunday-based week (%U)
else if let (Some(y), Some(w)) = (self.yr, self.wk_sun) {
if w > 53 {
return Err(an_err!(DtErrKind::WeekOutOfRange));
}
let wd = self.wkday.unwrap_or(Weekday::Sunday);
jd = Some(Dt::wk_sun_to_jd(y, w, wd));
}
// Monday-based week (%W)
else if let (Some(y), Some(w)) = (self.yr, self.wk_mon) {
if w > 53 {
return Err(an_err!(DtErrKind::WeekOutOfRange));
}
let wd = self.wkday.unwrap_or(Weekday::Monday);
jd = Some(Dt::wk_mon_to_jd(y, w, wd));
}
let Some(jd) = jd else {
if self.yr.is_none() && self.iso_wk_yr.is_none() {
return Err(an_err!(DtErrKind::ExpectedYear));
} else {
return Err(an_err!(DtErrKind::InvalidDate));
}
};
// ──────────────────────────────────────────────────────────────
// Resolve 12-hour time + meridiem (AM/PM) to 24-hour hour
// ──────────────────────────────────────────────────────────────
let hour = match self.meridiem {
None => self.hr,
Some(m) => {
if !(1..=12).contains(&self.hr) {
return Err(an_err!(DtErrKind::HourOutOfRange));
}
match (self.hr, m) {
(12, Meridiem::AM) => 0,
(12, Meridiem::PM) => 12,
(h, Meridiem::AM) => h,
(h, Meridiem::PM) => h + 12,
}
}
};
let minute = self.min as i64;
let mut second = self.sec as i64;
let sec_is_60 = second == 60;
if sec_is_60 {
second -= 1;
}
let days_since_j2000 = jd.saturating_sub(JD_2000_2_451_545);
let seconds_from_noon_utc = (hour as i64 - 12) * 3600 + minute * 60 + second;
let mut total_sec: i64 = days_since_j2000
.saturating_mul(SEC_PER_DAY_I64)
.saturating_add(seconds_from_noon_utc);
// ──────────────────────────────────────────────────────────────
// Apply timezone correction (IANA or Fixed offset)
// ──────────────────────────────────────────────────────────────
if let Some(name) = &self.iana_name {
let name_str = name.as_str();
if !name_str.is_empty() {
#[cfg(any(feature = "jiff-tz-bundle", feature = "jiff-tz"))]
{
use crate::TAI_SECS_1970_MIDNIGHT_TO_2000_NOON;
use jiff::{Timestamp, tz::TimeZone};
let tz =
TimeZone::get(name_str).map_err(|_| an_err!(DtErrKind::InvalidTimeZone))?;
let provisional_unix =
total_sec.saturating_add(TAI_SECS_1970_MIDNIGHT_TO_2000_NOON);
let civil = Timestamp::from_second(provisional_unix)
.map_err(|_| an_err!(DtErrKind::InvalidTimestamp))?
.to_zoned(jiff::tz::TimeZone::UTC)
.datetime();
let zoned = tz
.to_zoned(civil)
.map_err(|_| an_err!(DtErrKind::ConversionFail))?;
total_sec = zoned
.timestamp()
.as_second()
.saturating_sub(TAI_SECS_1970_MIDNIGHT_TO_2000_NOON);
}
#[cfg(not(any(feature = "jiff-tz-bundle", feature = "jiff-tz")))]
{
use crate::tz::UTC_ALIASES;
if !UTC_ALIASES.contains(&name_str) {
return Err(an_err!(DtErrKind::MissingFeature));
}
}
}
} else if let Some(Offset::Fixed(offset)) = self.offset {
// local civil time → true UTC instant
total_sec = total_sec.saturating_sub(offset as i64);
}
// ──────────────────────────────────────────────────────────────
// Final construction
// ──────────────────────────────────────────────────────────────
if !sec_is_60 {
Ok(Dt::from_sec_and_ufrac(total_sec, self.attos, self.scale))
// sec is 60
} else if self.scale.uses_leap_seconds() {
let t = Dt::from_sec_and_ufrac(total_sec, self.attos, self.scale);
match Dt::leap_sec_using_sec64(total_sec.saturating_add(1), true) {
Some(info) => match info.is_leap_sec {
IsLeapSec::Add => Ok(t.add_sec(1)),
// Negative leaps have no civil 23:59:60; treat as ordinary :59.
_ => Ok(t),
},
None => Ok(t),
}
} else {
Ok(Dt::from_sec_and_ufrac(total_sec, self.attos, self.scale))
}
}
}