A simple example of using js to get the time of the last week, month and three months

Get the time in the past week
Get the time of the past month
Get the last three months
New Date() vs. setDate() Parameters
Summarize

Get the time in the past week

var end = new Date();
var year = end.getFullYear();
var month = end.getMonth() + 1; //0-11 means January to December var day = end.getDate();
var dateObj = {};
dateObj.end = year + '-' + month + '-' + day;
if (day - 7 <= 0) { //If it is before the 7th of the month var startMonthDay = new Date(year, (parseInt(month) - 1), 0).getDate(); //Total number of days in the month 1 week ago if (month - 1 <= 0) { //If it is in January of the current year dateObj.start = (year - 1) + '-' + 12 + '-' + (31 - (7 - day));
    } else {
      dateObj.start = year + '-' + (month - 1) + '-' + (startMonthDay - (7 - day));
    }
} else {
    dateObj.start = year + '-' + month + '-' + (day - 7);
}
console.log(JSON.stringify(dateObj))
1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.

Get the time of the past month

var end = new Date();
var year = end.getFullYear();
var month = end.getMonth() + 1; //0-11 means January to December var day = end.getDate();
var dateObj = {};
dateObj.end = year + '-' + month + '-' + day;
var endMonthDay = new Date(year, month, 0).getDate(); //Total number of days in the current month if(month - 1 <= 0){ //If it is January, move forward one year<br>　
       dateObj.start = (year - 1) + '-' + 12 + '-' + day;
}else{
    var startMonthDay = new Date(year, (parseInt(month) - 1), 0).getDate();
    if(startMonthDay < day){ //The total number of days in the month one month ago is less than the current date if(day < endMonthDay){ //The current date is less than the total number of days in the current month dateObj.start = year + '-' + (month - 1) + '-' + (startMonthDay - (endMonthDay - day));
        }else{
            dateObj.start = year + '-' + (month - 1) + '-' + startMonthDay;
        }
    }else{
        dateObj.start = year + '-' + (month - 1) + '-' + day;
    }
}
console.log(JSON.stringify(dateObj))
1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.

Get the last three months

var end = new Date();
var year = end.getFullYear();
var month = end.getMonth() + 1; //0-11 means January to December var day = end.getDate();
var dateObj = {};
dateObj.end = year + '-' + month + '-' + day;
var endMonthDay = new Date(year, month, 0).getDate(); //Total number of days in the current monthif(month - 3 <= 0){ //If it is January, February or March, move forward one year var start3MonthDay = new Date((year - 1), (12 - (3 - parseInt(month))), 0).getDate(); //Total number of days in the month 3 months ago if(start3MonthDay < day){ //The total number of days in the month 3 months ago is less than the current date dateObj.start = (year - 1) + '-' + (12 - (3 - month)) + '-' + start3MonthDay;
    }else{
        dateObj.start = (year - 1) + '-' + (12 - (3 - month)) + '-' + day;
    }
}else{
    var start3MonthDay = new Date(year, (parseInt(month) - 3), 0).getDate(); //Total number of days in the month 3 months ago if(start3MonthDay < day){ //The total number of days in the month 3 months ago is less than the current date if(day < endMonthDay){ //The current date is less than the total number of days in the current month, February is a special month dateObj.start = year + '-' + (month - 3) + '-' + (start3MonthDay - (endMonthDay - day));
        }else{
            dateObj.start = year + '-' + (month - 3) + '-' + start3MonthDay;
        }
    }else{
        dateObj.start = year + '-' + (month - 3) + '-' + day;
    }
}
console.log(JSON.stringify(dateObj))

New Date() vs. setDate() Parameters

I believe there are already many articles about dates on the Internet. Here I just summarize the problems I encountered at work.

new Date()

new Date() has six forms, five with parameters and one without parameters;

new Date(); Needless to say, the default date obtained is the current date.
new Date("month1 dd,yyyy hh:mm:ss"); Note: The parameter is in character format
new Date("month1 dd,yyyy"); Note: The parameter is in character form
new Date(yyyy,month2,dd,hh,mm,ss); Note: The parameter is not a character
new Date(yyyy,month2,dd); Note: The parameter is not a character
new Date(ms);

Parameter Description:

month1: In English, it indicates the name of the month; from January to December;

dd: indicates date, 1-31

yyyy: indicates the year represented by four digits

hh:mm:ss: indicates time, hour (0-23) - minute (0-59) - second (0-59)

month2: is a number type month; from 0 to 11; i.e. January to December

ms: The number of milliseconds since January 1, 1970

Special reminder: some are in character form and some are not

Summarize

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