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rust: Use i64 for internal unix timestamps #842

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Nov 21, 2024
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rust: Use i64 for internal unix timestamps #842

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38 changes: 19 additions & 19 deletions rust/src/helpers.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -49,57 +49,57 @@ pub fn local_time(
microsecond: usize,
) -> (usize, usize, usize, usize, usize, usize, usize) {
let mut year: usize = EPOCH_YEAR as usize;
let mut seconds: isize = unix_time.floor() as isize;
let mut seconds: i64 = unix_time.floor() as i64;

// Shift to a base year that is 400-year aligned.
if seconds >= 0 {
seconds -= (10957 * SECS_PER_DAY as usize) as isize;
seconds -= 10957 * SECS_PER_DAY as i64;
year += 30; // == 2000
} else {
seconds += ((146_097 - 10957) * SECS_PER_DAY as usize) as isize;
seconds += (146_097 - 10957) * SECS_PER_DAY as i64;
year -= 370; // == 1600
}

seconds += utc_offset;
seconds += utc_offset as i64;

// Handle years in chunks of 400/100/4/1
year += 400 * (seconds / SECS_PER_400_YEARS as isize) as usize;
seconds %= SECS_PER_400_YEARS as isize;
year += 400 * (seconds / SECS_PER_400_YEARS as i64) as usize;
seconds %= SECS_PER_400_YEARS as i64;
if seconds < 0 {
seconds += SECS_PER_400_YEARS as isize;
seconds += SECS_PER_400_YEARS as i64;
year -= 400;
}

let mut leap_year = 1; // 4-century aligned
let mut sec_per_100years = SECS_PER_100_YEARS[leap_year] as isize;
let mut sec_per_100years = SECS_PER_100_YEARS[leap_year].try_into().unwrap();

while seconds >= sec_per_100years {
seconds -= sec_per_100years;
year += 100;
leap_year = 0; // 1-century, non 4-century aligned
sec_per_100years = SECS_PER_100_YEARS[leap_year] as isize;
sec_per_100years = SECS_PER_100_YEARS[leap_year].try_into().unwrap();
}

let mut sec_per_4years = SECS_PER_4_YEARS[leap_year] as isize;
let mut sec_per_4years = SECS_PER_4_YEARS[leap_year].into();
while seconds >= sec_per_4years {
seconds -= sec_per_4years;
year += 4;
leap_year = 1; // 4-year, non century aligned
sec_per_4years = SECS_PER_4_YEARS[leap_year] as isize;
sec_per_4years = SECS_PER_4_YEARS[leap_year].into();
}

let mut sec_per_year = SECS_PER_YEAR[leap_year] as isize;
let mut sec_per_year = SECS_PER_YEAR[leap_year].into();
while seconds >= sec_per_year {
seconds -= sec_per_year;
year += 1;
leap_year = 0; // non 4-year aligned
sec_per_year = SECS_PER_YEAR[leap_year] as isize;
sec_per_year = SECS_PER_YEAR[leap_year].into();
}

// Handle months and days
let mut month = TM_DECEMBER + 1;
let mut day: usize = (seconds / (SECS_PER_DAY as isize) + 1) as usize;
seconds %= SECS_PER_DAY as isize;
let mut day: usize = (seconds / (SECS_PER_DAY as i64) + 1) as usize;
seconds %= SECS_PER_DAY as i64;

let mut month_offset: usize;
while month != (TM_JANUARY + 1) {
Expand All @@ -113,10 +113,10 @@ pub fn local_time(
}

// Handle hours, minutes and seconds
let hour: usize = (seconds / SECS_PER_HOUR as isize) as usize;
seconds %= SECS_PER_HOUR as isize;
let minute: usize = (seconds / SECS_PER_MIN as isize) as usize;
let second: usize = (seconds % SECS_PER_MIN as isize) as usize;
let hour: usize = (seconds / SECS_PER_HOUR as i64) as usize;
seconds %= SECS_PER_HOUR as i64;
let minute: usize = (seconds / SECS_PER_MIN as i64) as usize;
let second: usize = (seconds % SECS_PER_MIN as i64) as usize;

(year, month, day, hour, minute, second, microsecond)
}
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