52 lines
1.4 KiB
Rust
52 lines
1.4 KiB
Rust
use crate::date::Date;
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use std::env;
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use std::time::{SystemTime, UNIX_EPOCH};
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// Timestamp of 2016-03-01 00:00:00 in UTC.
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const BASE: u64 = 1456790400;
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const BASE_YEAR: u16 = 2016;
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const BASE_MONTH: u8 = 3;
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// Days between leap days.
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const CYCLE: u64 = 365 * 4 + 1;
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const DAYS_BY_MONTH: [u8; 12] = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
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pub fn today() -> Date {
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let default = Date {
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year: 2025,
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month: 2,
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day: 25,
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};
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try_today().unwrap_or(default)
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}
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fn try_today() -> Option<Date> {
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if let Some(pkg_name) = env::var_os("CARGO_PKG_NAME") {
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if pkg_name.to_str() == Some("rustversion-tests") {
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return None; // Stable date for ui testing.
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}
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}
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let now = SystemTime::now();
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let since_epoch = now.duration_since(UNIX_EPOCH).ok()?;
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let secs = since_epoch.as_secs();
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let approx_days = secs.checked_sub(BASE)? / 60 / 60 / 24;
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let cycle = approx_days / CYCLE;
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let mut rem = approx_days % CYCLE;
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let mut year = BASE_YEAR + cycle as u16 * 4;
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let mut month = BASE_MONTH;
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loop {
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let days_in_month = DAYS_BY_MONTH[month as usize - 1];
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if rem < days_in_month as u64 {
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let day = rem as u8 + 1;
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return Some(Date { year, month, day });
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}
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rem -= days_in_month as u64;
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year += (month == 12) as u16;
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month = month % 12 + 1;
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}
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}
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