JavaScript 如何检查日期是否早于1小时前

给定一个日期，任务是使用JavaScript检查给定的日期是否早于1小时前。

方法1

计算当前日期和之前日期之间的毫秒差。
如果大于1小时的毫秒数，则返回false，否则返回true。

示例： 这个示例实现了上述方法。

<h1 style="color:green;"> 
    GeeksForGeeks 
</h1> 
  
<p id="GFG_UP" style="font-size: 15px; font-weight: bold;"> 
</p> 
  
<button onclick="gfg_Run()"> 
    click here 
</button> 
  
<p id="GFG_DOWN" style="color:green; 
        font-size: 20px; font-weight: bold;"> 
</p> 
  
<script> 
    var el_up = document.getElementById("GFG_UP"); 
    var el_down = document.getElementById("GFG_DOWN"); 
    var prev_date = new Date(); 
    var d = new Date(); 
          
    Date.prototype.addHours = function(h) { 
        this.setTime(this.getTime() + (h*60*60*1000)); 
        return this; 
    } 
      
    prev_date.addHours(-2); 
    el_up.innerHTML = "Click on the button to " 
            + "check if the date is less than " 
            + "1 hour ago.<br>Previous date = " 
            + prev_date; 
      
    function gfg_Run() { 
          
        // Hour in milliseconds 
        var ONE_HOUR = 60 * 60 * 1000; 
          
        if ((d - prev_date) < ONE_HOUR) { 
            el_down.innerHTML = "Date is less"
                        + " than 1 hour ago."; 
        } 
        else { 
            el_down.innerHTML = "Date is not "
                    + "less than 1 hour ago."; 
        } 
    }         
</script>

输出：

JavaScript 如何检查日期是否早于1小时前

方法2

从当前时间减去1小时的毫秒数。
比较当前日期和上一个日期的毫秒数。
如果这些毫秒数大于1小时的毫秒数，则返回false，否则返回true。

示例2： 这个示例使用如上所述的方法。

<h1 style="color:green;"> 
    GeeksForGeeks 
</h1> 
  
<p id="GFG_UP" style="font-size: 15px; font-weight: bold;"> 
</p> 
  
<button onclick="gfg_Run()"> 
    click here 
</button> 
  
<p id="GFG_DOWN" style="color:green; 
        font-size: 20px; font-weight: bold;"> 
</p> 
  
<script> 
    var el_up = document.getElementById("GFG_UP"); 
    var el_down = document.getElementById("GFG_DOWN"); 
    var prev_date = new Date(); 
    var d = new Date(); 
      
    const check = (date) => { 
        const HOUR = 1000 * 60 * 60; 
        const anHourAgo = Date.now() - HOUR; 
        return date > anHourAgo; 
    } 
    el_up.innerHTML = "Click on the button to check" 
                + " if the date is less than 1 hour" 
                + " ago.<br>Previous date = " + prev_date; 
      
    function gfg_Run() { 
        var c = check(prev_date); 
          
        if (c) { 
            el_down.innerHTML = "Date is less " 
                        + "than 1 hour ago."; 
        } 
        else { 
            el_down.innerHTML = "Date is not less" 
                        + " than 1 hour ago."; 
        } 
    }         
</script>