[Bug Report] el-date-picker， type="date" ，firstDayOfWeek: 3, select the day is not right

### Element UI version
2.12.0

### OS/Browsers version
chrome

### Vue version
2.6.10

### Reproduction Link
https://codepen.io/pen/?&editable=true

### Steps to reproduce
一、el-date-picker， type="date" ，【or type="week" 】，set firstDayOfWeek: 3
二、select a day，
三、and the day is not what i select，（find in the month of ：1，4，7，10）
and the hightLight day is not today：for egx: today is 2019-10-23 but the hightLight day is 2019-10-16

### What is Expected?
the day is right

### What is actually happening?
view the rong day