52 lines
1.4 KiB
Rust
52 lines
1.4 KiB
Rust
use chrono::{Date, DateTime, FixedOffset, NaiveDate, TimeZone, Utc};
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use serde::{self, Deserialize, Deserializer};
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// * format => 2021-01-01 00:00:00 +0100 CET
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const FORMAT: &str = "%Y-%m-%d %H:%M:%S %z %Z";
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pub fn deserialize<'de, D>(deserializer: D) -> Result<DateTime<FixedOffset>, D::Error>
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where
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D: Deserializer<'de>,
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{
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let s = String::deserialize(deserializer)?;
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DateTime::parse_from_str(&s, FORMAT).map_err(serde::de::Error::custom)
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}
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fn get_day_month(year: i32, month: u32) -> u32 {
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let date: NaiveDate;
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if month == 12 {
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date = NaiveDate::from_ymd(year + 1, 1, 1)
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} else {
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date = NaiveDate::from_ymd(year, month + 1, 1)
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}
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u32::try_from(
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date.signed_duration_since(NaiveDate::from_ymd(year, month, 1))
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.num_days(),
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)
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.expect("failed to convert i64 to u32")
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}
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pub fn get_past_date(mut year: i32, mut month: u32, mut day: u32, day_remove: u32) -> Date<Utc> {
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if u32::checked_sub(day, day_remove).is_none() || (day - day_remove) < 1 {
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if (month - 1) < 1 {
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month = 12;
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year -= 1;
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} else {
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month -= 1;
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}
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let new_day = get_day_month(year, month);
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day = match day {
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2 => new_day,
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1 => new_day - 1,
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_ => panic!("invalid day in condition..."),
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}
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} else {
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day -= day_remove;
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}
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Utc.from_utc_date(&NaiveDate::from_ymd(year, month, day))
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}
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