如何获得Rust一个月的天数？

1 回答

• 1

  您可以使用chrono crate中的NaiveDate::signed_duration_since：

  use chrono::NaiveDate;
  
  fn main() {
      let year = 2018;
      for (m, d) in (1..=12).map(|m| {
          (
              m,
              if m == 12 {
                  NaiveDate::from_ymd(year + 1, 1, 1)
              } else {
                  NaiveDate::from_ymd(year, m + 1, 1)
              }.signed_duration_since(NaiveDate::from_ymd(year, m, 1))
              .num_days(),
          )
      }) {
          println!("days {} in month {}", d, m);
      }
  }
  

  回复于 2024-04-29T06:40:34+08:00