具有相同日期格式的javascript日期

Question

我在 javascript 日期中遇到了一个问题。我想做相同的日期格式 previous date和 start dateExcepted Output上一个日期

12AM 之后显示 00:00:00 到 12:00:00

12PM 后显示 00:00:00 至 12:00:00

格式

previous date 2020-05-10 16:31:28

开始日期

2020-05-10 02:00:00              //sample data
2020-05-10 05:00:00

我的代码:

   

    

    

     

     
var currentdate = new Date();
var prevdate = new Date(); //previous date

prevdate.setTime(currentdate.getTime() - (30 * 60 * 1000));

var newprevious = GetFormattedDate(prevdate);
console.log(newprevious);

//Date format yyyy-mm-dd h:MM:ss
function GetFormattedDate(date) {
  var month = ("0" + (date.getMonth() + 1)).slice(-2);
  var day = ("0" + (date.getDate())).slice(-2);
  var year = date.getFullYear();
  var hour = ("0" + (date.getHours())).slice(-2);
  var min = ("0" + (date.getMinutes())).slice(-2);
  var seg = ("0" + (date.getSeconds())).slice(-2);
  return year + "-" + month + "-" + day + " " + hour + ":" + min + ":" + seg;
}
     

     

     
注意:我无法更改开始日期，它是 
     fixed格式
     

     
我应该改变什么？有人帮我吗？
     
 
    
 
    
 
     
 最佳答案 
 
    
 
    
 
     
如果问题只是小时不是 am/pm 格式，您可以使用模运算符以这种方式修改您的函数(我还在字符串的末尾添加了 am/pm):

 
     
var currentdate = new Date();
var prevdate = new Date(); //previous date

prevdate.setTime(currentdate.getTime() - (30 * 60 * 1000));

var newprevious = GetFormattedDate(prevdate);
console.log(newprevious);

//Date format yyyy-mm-dd h:MM:ss
function GetFormattedDate(date) {
  var month = ("0" + (date.getMonth() + 1)).slice(-2);
  var day = ("0" + (date.getDate())).slice(-2);
  var year = date.getFullYear();
  
  // EDIT:
  var hour = date.getHours()%12; // using the modulo operator, you convert the hours to a range between 0 and 12

  if (hour == 0) {
      hour = 12;
  }
  
  var timeOfDay = "am";      

  if (date.getHours() >= 12) {
      timeOfDay = "pm";
  }

  hour = ("0" + hour).slice(-2);
  
 // END EDIT

  var min = ("0" + (date.getMinutes())).slice(-2);
  var seg = ("0" + (date.getSeconds())).slice(-2);
  return year + "-" + month + "-" + day + " " + hour + ":" + min + ":" + seg + " " + timeOfDay;
}
     
 
    
 
    
 
     
关于具有相同日期格式的javascript日期，我们在Stack Overflow上找到一个类似的问题：  https://stackoverflow.com/questions/61711827/  
 
    
 
   
	    	    					            
   
 
    
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Answer 1

如果问题只是小时不是 am/pm 格式，您可以使用模运算符以这种方式修改您的函数(我还在字符串的末尾添加了 am/pm):

var currentdate = new Date();
var prevdate = new Date(); //previous date

prevdate.setTime(currentdate.getTime() - (30 * 60 * 1000));

var newprevious = GetFormattedDate(prevdate);
console.log(newprevious);

//Date format yyyy-mm-dd h:MM:ss
function GetFormattedDate(date) {
  var month = ("0" + (date.getMonth() + 1)).slice(-2);
  var day = ("0" + (date.getDate())).slice(-2);
  var year = date.getFullYear();
  
  // EDIT:
  var hour = date.getHours()%12; // using the modulo operator, you convert the hours to a range between 0 and 12

  if (hour == 0) {
      hour = 12;
  }
  
  var timeOfDay = "am";      

  if (date.getHours() >= 12) {
      timeOfDay = "pm";
  }

  hour = ("0" + hour).slice(-2);
  
 // END EDIT

  var min = ("0" + (date.getMinutes())).slice(-2);
  var seg = ("0" + (date.getSeconds())).slice(-2);
  return year + "-" + month + "-" + day + " " + hour + ":" + min + ":" + seg + " " + timeOfDay;
}