Calendar 日期double类型查询处理

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/haoyuexihuai/article/details/80590663

系统中将Calendar生产的时间转换为了double类型保存到数据库中。因此在查询时间时需要对传入的日期进行转换。查询具体某一天的数据，思路是查询当天0点到23点的数据。

//时间精确到毫秒，保存数据的时候扩大了1000倍

//获取指定日期0点
public static double todayFirstDate(int year,int month,int day) {
    Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.YEAR,year);
    calendar.set(Calendar.MONTH,month);
    calendar.set(Calendar.DAY_OF_MONTH,day);
    calendar.set(Calendar.HOUR_OF_DAY, 0);
    calendar.set(Calendar.MINUTE, 0);
    calendar.set(Calendar.SECOND, 0);
    calendar.set(Calendar.MILLISECOND, 0);
    return calendar.getTimeInMillis()/1000;
}

//获取指定日期23点
public static double todayLastDate(int year,int month,int day) {
     Calendar calendar = Calendar.getInstance();
     calendar.set(Calendar.YEAR,year);
     calendar.set(Calendar.MONTH,month);
     calendar.set(Calendar.DAY_OF_MONTH,day);
     calendar.set(Calendar.HOUR_OF_DAY, 23);
     calendar.set(Calendar.MINUTE, 59);
     calendar.set(Calendar.SECOND, 59);
     calendar.set(Calendar.MILLISECOND, 999);
     return calendar.getTimeInMillis()/1000;
 }