Java code example to calculate the time between two dates

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java calculates the time between two dates

There is a field in the database of datetime type, and I want to calculate how many days, hours, and minutes have passed between two dates.

The idea is to convert time into milliseconds (the time difference from midnight on January 1, 1970 UTC (measured in milliseconds)). Then use the addition and subtraction of milliseconds to calculate.

The calculation is as follows:

public static String getDays(Date date){
    Calendar cal=Calendar.getInstance();
    cal.setTime(date);
    long oldTime=cal.getTimeInMillis();
    long nowTime=System.currentTimeMillis();
    long days=(nowTime-oldTime)/(1000*60*60*24);//天数
    long hours=((nowTime-oldTime)%(1000*60*60*24))/(1000*60*60);//小时数
    long minutes=(((nowTime-oldTime)%(1000*60*60*24))%(1000*60*60))/(1000*60);//分钟数
    long seconds=((((nowTime-oldTime)%(1000*60*60*24))%(1000*60*60))%(1000*60))/1000;//秒数
    return days+"天"+hours+"小时"+minutes+"分钟"+seconds+"秒";
  }

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