一、题目

Given a string date representing a Gregorian calendar date formatted as YYYY-MM-DD, return the day number of the year.

Example 1:

Input: date = “2019-01-09”
Output: 9
Explanation: Given date is the 9th day of the year in 2019.
Example 2:

Input: date = “2019-02-10”
Output: 41

Constraints:

date.length == 10
date[4] == date[7] == ‘-’, and all other date[i]'s are digits
date represents a calendar date between Jan 1st, 1900 and Dec 31th, 2019.

二、题解

class Solution {
public:int dayOfYear(string date) {tm timeinfo;  strptime(date.c_str(), "%Y-%m-%d", &timeinfo);  return timeinfo.tm_yday + 1;  }
};