Write a program to count the number of days between two dates.
\n\nThe two dates are given as strings, their format is YYYY-MM-DD as shown in the examples.
\n
Example 1:
\nInput: date1 = \"2019-06-29\", date2 = \"2019-06-30\"\nOutput: 1\n
Example 2:
\nInput: date1 = \"2020-01-15\", date2 = \"2019-12-31\"\nOutput: 15\n\n
\n
Constraints:
\n\n1971 and 2100.请你编写一个程序来计算两个日期之间隔了多少天。
\n\n日期以字符串形式给出，格式为 YYYY-MM-DD，如示例所示。
\n\n
示例 1：
\n\n输入：date1 = "2019-06-29", date2 = "2019-06-30"\n输出：1\n\n\n
示例 2：
\n\n输入：date1 = "2020-01-15", date2 = "2019-12-31"\n输出：15\n\n\n
\n\n
提示：
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"book": null,
"isSubscribed": false,
"isDailyQuestion": false,
"dailyRecordStatus": null,
"editorType": "CKEDITOR",
"ugcQuestionId": null,
"style": "LEETCODE",
"exampleTestcases": "\"2019-06-29\"\n\"2019-06-30\"\n\"2020-01-15\"\n\"2019-12-31\"",
"__typename": "QuestionNode"
}
}
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