diff --git a/1651_daytoday/Readme.md b/1651_daytoday/Readme.md
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+# 标题
+
+* 内容
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diff --git a/1651_daytoday/doc/Readme.md b/1651_daytoday/doc/Readme.md
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+# 	『入门』（函数专题）今天星期几
+
+[问题描述]
+
+本题必需使用自定义函数完成  
+
+　　编一程序实现： 由输入1980年以后的任意一个日期后，计算机能打印出该日期是星期几。系统保证输入的日期肯定是合法，绝不会出现类似-23年13月52日的情况。已知1980年1月1日是星期二。  
+
+[输入格式]  
+　　年 月 日，日期有3个整数组成，中间用空格隔开。  
+
+[输出格式]  
+　　一个整数值表示星期几。星期用1 2 3 4 5 6 7表示。（若是星期日就输出7）   
+
+[输入样例]  
+2009 1 2  
+
+[输出样例]  
+5  
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diff --git a/1651_daytoday/main.cpp b/1651_daytoday/main.cpp
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+#include <iostream>
+using namespace std;
+int main()
+{
+    int year ,month,day,ans=1,a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
+    cin>>year>>month>>day;
+    ans+=year-1980;
+    if(month>3){
+        year++;
+    }
+    for(int i=1980;i<year;i+=4){
+        if(i%100!=0){
+            ans++;
+        }
+        if(i%400==0){
+            ans++;
+        }
+    }
+    for(int i=1;i<month;i++){
+        ans+=a[i];
+    }
+    ans+=day;
+    ans%=7;
+    if(ans==0){
+        ans=7;
+    }
+    cout<<ans;
+}
diff --git a/1651_daytoday/main.exe b/1651_daytoday/main.exe
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Binary files /dev/null and b/1651_daytoday/main.exe differ
diff --git a/1651_daytoday/test/in.txt b/1651_daytoday/test/in.txt
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+++ b/1651_daytoday/test/in.txt
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+2009 1 2 
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diff --git a/1651_daytoday/test/in2.txt b/1651_daytoday/test/in2.txt
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+++ b/1651_daytoday/test/in2.txt
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+2078 3 24
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diff --git a/1651_daytoday/test/in3.txt b/1651_daytoday/test/in3.txt
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+++ b/1651_daytoday/test/in3.txt
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+2020 4 26
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diff --git a/1651_daytoday/test/out.txt b/1651_daytoday/test/out.txt
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+++ b/1651_daytoday/test/out.txt
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+## z:\Chao\src\1651_daytoday\test\in.txt 
+2020/04/24 周五 13:26:59.32 
+5
+-----------------------------------------------
+Process exited after 140 ms with return value 0
+
+## z:\Chao\src\1651_daytoday\test\in2.txt 
+2020/04/24 周五 13:26:59.32 
+4
+-----------------------------------------------
+Process exited after 150 ms with return value 0
+
+## z:\Chao\src\1651_daytoday\test\in3.txt 
+2020/04/24 周五 13:26:59.32 
+7
+-----------------------------------------------
+Process exited after 90 ms with return value 0
+