Java时间工具类-蒲公英云

Java时间工具类

该时间工具类功能：时间戳格式化至毫秒、时间戳格式化至秒、时间戳格式化至日、时间戳格式化成时和分、Date对象格式化至毫秒、Date对象格式化至秒、Date对象格式化至日、Date对象格式化成时和分、Date对象格式化成年份、时间格式为时和分转换为时间戳、时间格式为年月日转换为时间戳、时间格式为年月日时分秒转换为时间戳、获取当前时间的前一天日期。

package com.blog.chen_2890.utils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/** * @author https://blog.csdn.net/chen_2890 * @description TimeUtil * @date 2019/5/9 14:57 */
public class TimeUtil { 
    public static String formatToMillis(Long millis){ 
        Long memberTime = millis;
        Date dt = new Date(memberTime);
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
        return dateFormat.format(dt);
    }
    public static String formatToSecond(Long millis){ 
        Long memberTime = millis;
        Date dt = new Date(memberTime);
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return dateFormat.format(dt);
    }
    public static String formatToDate(Long millis){ 
        Long memberTime = millis;
        Date dt = new Date(memberTime);
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        return dateFormat.format(dt);
    }
    public static String formatToHourMinute(Long millis){ 
        Long memberTime = millis;
        Date dt = new Date(memberTime);
        SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm");
        return dateFormat.format(dt);
    }
    public static String formatToMillis(Date date){ 
        Date dt = date;
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
        return dateFormat.format(dt);
    }
    public static String formatToSecond(Date date){ 
        Date dt = date;
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        return dateFormat.format(dt);
    }
    public static String formatToDate(Date date){ 
        Date dt = date;
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        return dateFormat.format(dt);
    }
    public static String formatToHourMinute(Date date){ 
        Date dt = date;
        SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm");
        return dateFormat.format(dt);
    }
    public static String formatToYear(Date date){ 
        Date dt = date;
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy");
        return dateFormat.format(dt);
    }
    public static Long fromHourMinuteToMillis(String format){ 
        SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm");
        try { 
            Date date = dateFormat.parse(format);
            return date.getTime();
        } catch (ParseException e) { 
            e.printStackTrace();
        }
        return null;
    }
    public static Long fromDateToMillis(String format){ 
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        try { 
            Date date = dateFormat.parse(format);
            return date.getTime();
        } catch (ParseException e) { 
            e.printStackTrace();
        }
        return null;
    }
    public static Long fromSecondToMillis(String format){ 
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try { 
            Date date = dateFormat.parse(format);
            return date.getTime();
        } catch (ParseException e) { 
            e.printStackTrace();
        }
        return null;
    }
    public static String beforeOneDayDate(){ 
        //此时打印它获取的是系统当前时间
        Calendar calendar = Calendar.getInstance();
        //得到前一天
        calendar.add(Calendar.DATE, -1);
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        try { 
            return dateFormat.format(calendar.getTime());
        } catch (Exception e) { 
            e.printStackTrace();
        }
       return null;
    }
}