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use crate::leap_seconds::leap_sec;
use crate::{
Dt, JD_2000_2_451_545, SEC_PER_DAYI64, TAI_SECS_1970_MIDNIGHT_TO_2000_NOON, an_err,
error::{DtErr, DtErrKind},
{Meridiem, Offset, TimeParts, Weekday},
};
impl TimeParts {
/// Converts [`TimeParts`] → [`Dt`].
/// - Resulting [`Dt`] is on the TAI timescale.
/// - If this [`TimeParts`] has a unix timestamp then it is used
/// instead of anything else.
pub fn to_dt(&self) -> Result<Dt, DtErr> {
// ──────────────────────────────────────────────────────────────
// Fast path: explicit Unix timestamp
// ──────────────────────────────────────────────────────────────
if let Some(unix_secs) = self.unix_timestamp_seconds {
let total_sec = unix_secs.saturating_sub(TAI_SECS_1970_MIDNIGHT_TO_2000_NOON);
return Ok(Dt::from_sec_and_attos(total_sec, self.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::InvalidInput, "ymd"));
}
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::OutOfRange, "day of year"));
}
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::OutOfRange, "iso week"));
}
if iso_w == 53 && !Dt::has_iso_wk_53(iso_y) {
return Err(an_err!(DtErrKind::InvalidItem, "iso week"));
}
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::OutOfRange, "week number"));
}
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::OutOfRange, "week number"));
}
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::Incomplete, "no year"));
} else {
return Err(an_err!(
DtErrKind::InvalidInput,
"could not create julian date"
));
}
};
// ──────────────────────────────────────────────────────────────
// 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::OutOfRange, "hour: {}", self.hr));
}
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 = second.saturating_sub(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_DAYI64)
.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(feature = "jiff-tz")]
{
use jiff::{Timestamp, tz::TimeZone};
let tz = TimeZone::get(name_str).map_err(|e| {
an_err!(
DtErrKind::InvalidTimezoneOffset,
"invalid tz {:?}: {}",
name,
e
)
})?;
let provisional_unix =
total_sec.saturating_add(TAI_SECS_1970_MIDNIGHT_TO_2000_NOON);
let civil = Timestamp::from_second(provisional_unix)
.map_err(|e| {
an_err!(
DtErrKind::InvalidNumber,
"invalid unix {:?}: {}",
provisional_unix,
e
)
})?
.to_zoned(jiff::tz::TimeZone::UTC)
.datetime();
let zoned = tz.to_zoned(civil).map_err(|e| {
an_err!(
DtErrKind::OutOfRange,
"jiff to_zoned failed for {}: {}",
name_str,
e
)
})?;
total_sec = zoned
.timestamp()
.as_second()
.saturating_sub(TAI_SECS_1970_MIDNIGHT_TO_2000_NOON);
}
#[cfg(not(feature = "jiff-tz"))]
{
use crate::tz::UTC_ALIASES;
if !UTC_ALIASES.contains(&name_str) {
return Err(an_err!(
DtErrKind::InvalidBytes,
"non-utc tz: {} requires jiff-tz feature",
name_str,
));
}
}
}
} 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_attos(total_sec, self.attos, self.scale))
} else {
if self.scale.uses_leap_seconds() {
let t = Dt::from_sec_and_attos(total_sec, self.attos, self.scale);
let is_leap_sec = match leap_sec(total_sec.saturating_add(1), true) {
Some(info) => info.is_leap_sec,
None => false,
};
if is_leap_sec { Ok(t.add_sec(1)) } else { Ok(t) }
} else {
Ok(Dt::from_sec_and_attos(total_sec, self.attos, self.scale))
}
}
}
}