## 1185. Day of the Week

Given a date, return the corresponding day of the week for that date.

The input is given as three integers representing the `day`

, `month`

and `year`

respectively.

Return the answer as one of the following values `{"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"}`

.

**Example 1:**

Input:day = 31, month = 8, year = 2019Output:"Saturday"

**Example 2:**

Input:day = 18, month = 7, year = 1999Output:"Sunday"

**Example 3:**

Input:day = 15, month = 8, year = 1993Output:"Sunday"

**Constraints:**

- The given dates are valid dates between the years
`1971`

and`2100`

.

## Rust Solution

```
struct Solution;
impl Solution {
fn day_of_the_week(day: i32, mut month: i32, mut year: i32) -> String {
let days = [
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday",
];
if month < 3 {
month += 12;
year -= 1;
}
let week =
(day + ((month + 1) * 26) / 10 + year + year / 4 + 6 * (year / 100) + year / 400 + 5)
% 7
+ 1;
days[week as usize % 7].to_string()
}
}
#[test]
fn test() {
let day = 31;
let month = 8;
let year = 2019;
let res = "Saturday".to_string();
assert_eq!(Solution::day_of_the_week(day, month, year), res);
let day = 18;
let month = 7;
let year = 1999;
let res = "Sunday".to_string();
assert_eq!(Solution::day_of_the_week(day, month, year), res);
let day = 15;
let month = 8;
let year = 1993;
let res = "Sunday".to_string();
assert_eq!(Solution::day_of_the_week(day, month, year), res);
}
```

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