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use crate::constants::{
DAYS_PER_L_YEAR, DAYS_PER_N_YEAR, DAY_OF_WEEK_TABLE, EPOCH_YEAR, MONTHS_OFFSETS,
SECS_PER_100_YEARS, SECS_PER_400_YEARS, SECS_PER_4_YEARS, SECS_PER_DAY, SECS_PER_HOUR,
SECS_PER_MIN, SECS_PER_YEAR, TM_DECEMBER, TM_JANUARY,
};
fn p(year: i32) -> i32 {
year + year / 4 - year / 100 + year / 400
}
pub fn is_leap(year: i32) -> bool {
year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)
}
pub fn is_long_year(year: i32) -> bool {
(p(year) % 7 == 4) || (p(year - 1) % 7 == 3)
}
pub fn days_in_year(year: i32) -> u32 {
if is_leap(year) {
return DAYS_PER_L_YEAR;
}
DAYS_PER_N_YEAR
}
pub fn week_day(year: i32, month: u32, day: u32) -> u32 {
let y: i32 = year - i32::from(month < 3);
let w: i32 = (p(y) + DAY_OF_WEEK_TABLE[(month - 1) as usize] as i32 + day as i32) % 7;
if w == 0 {
return 7;
}
w.unsigned_abs()
}
pub fn day_number(year: i32, month: u8, day: u8) -> i32 {
let m = i32::from((month + 9) % 12);
let y = year - m / 10;
365 * y + y / 4 - y / 100 + y / 400 + (m * 306 + 5) / 10 + (i32::from(day) - 1)
}
pub fn local_time(
unix_time: f64,
utc_offset: isize,
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;
// Shift to a base year that is 400-year aligned.
if seconds >= 0 {
seconds -= (10957 * SECS_PER_DAY as usize) as isize;
year += 30; // == 2000
} else {
seconds += ((146_097 - 10957) * SECS_PER_DAY as usize) as isize;
year -= 370; // == 1600
}
seconds += utc_offset;
// 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;
if seconds < 0 {
seconds += SECS_PER_400_YEARS as isize;
year -= 400;
}
let mut leap_year = 1; // 4-century aligned
let mut sec_per_100years = SECS_PER_100_YEARS[leap_year] as isize;
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;
}
let mut sec_per_4years = SECS_PER_4_YEARS[leap_year] as isize;
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;
}
let mut sec_per_year = SECS_PER_YEAR[leap_year] as isize;
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;
}
// 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 month_offset: usize;
while month != (TM_JANUARY + 1) {
month_offset = MONTHS_OFFSETS[leap_year][month] as usize;
if day > month_offset {
day -= month_offset;
break;
}
month -= 1;
}
// 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;
(year, month, day, hour, minute, second, microsecond)
}
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