Method to get any date like previous day, previous month, previous year, etc.

For example the previous day is:

let a = new Date();

a.setDate(a.getDate() - 1);

a.Format("yyyy-MM-dd hh:mm:ss.S");

is the previous day's date;

The previous month:

let a = new Date();

a.setMonth(a.getMonth() - 1);

a.Format("yyyy-MM-dd hh:mm:ss.S");

Other time methods and so on;

I don't know why this method has not been discovered before;

Format is a date formatting method written by a big guy, which is very easy to use;

Returns the specified time format ), seconds (s), quarter (q) can use 1-2 placeholders, // year (y) can use 1-4 placeholders, and milliseconds (S) can only use 1 placeholder ( 1-3 digits)// Example: // (new Date()).Format("yyyy-MM-dd hh:mm:ss.S") ==> 2006-0... https: //blog.csdn.net/qq_18676843/article/details/85266693?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522163920717816780357249694%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522% 257D&request_id=163920717816780357249694&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~blog~first_rank_v2~rank_v29-1-85266693.pc_v2_rank_blog_default&utm_term=%E6%97%B6%E9%BC%E5AB4%E6%%E5A %BC%8F&spm=1018.2226.3001.4450