Function covid19db::dateutil::ymd_to_day

pub fn ymd_to_day(year: i32, month: u32, day: u32) -> i32

Convert a year, month, day to an i32-based day

use covid19db::dateutil::*;
use chrono::prelude::*;

assert_eq!(ymd_to_day(2015, 3, 14), 2457096);