Java获取时间戳精确到年月日时
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System.currentTimeMillis()是获取当前系统时间的时间戳，我如果想获取当前系统时间戳精确到小时，不要分、秒、毫秒，应该怎么写代码？
比如当前时间是2017-01-16 17:14:51 时间戳是 1484558091067
我想取到2017-01-16 17:00:00 的话代码应该怎么写，求老师指点
new SimpleDateFormat("yyyy-MM-dd HH:00:00").format(System.currentTimeMillis()); 参考技术A new SimpleDateFormat("yyyy-MM-dd HH:00:00").format(new Date());
JAVA 日期工具类：日期获取周，获取指定周周一周日，某月月初月末日期，日期时间戳字符串转换，日期加减等
JAVA 日期工具类
- 获取某天00:00:00点的时间戳
- 日期获取周
- 日期获取星期几
- 获取时间戳属于当月的哪天
- 获取指定周周一周日
- 获取某月月初月末日期
- 根据星期几获取日期
- 获取年月日，时分秒
- 根据day获取所在周，周一周日
- 根据day获取所在月，月初月末日期
- 根据day获取上月月末的时间戳
- 日期时间戳字符串转换
- 日期加减等
源码
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.5</version>
</dependency>
<dependency>
<groupId>org.projectlombok</gr.oupId>
<artifactId>lombok</artifactId>.1
<version>1.18.8</version>
</dependency>
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.time.DateFormatUtils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
/*************************************
*Class Name: TimeUtils
*Description: <时间工具类>
*@author: Seminar
*@create: 2022/9/15
*@since 1.0.0
*************************************/
@Slf4j
public class TimeUtils
public static final long ONEDAYMILLIS = 24 * 60 * 60 * 1000;
public static final String Y_M_D = "yyyy-MM-dd";
public static final String YMD = "yyyyMMdd";
public static final String YMDHMS = "yyyy-MM-dd HH:mm:ss.SSS";
/**
* 获取当天的00：00：00的时间戳
*
* @return
*/
public static long getBeginMillisOfDay()
Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date());
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
return calendar.getTimeInMillis();
/**
* 获取某天的00：00：00的时间戳
*
* @param millis 毫秒时间戳
* @return
*/
public static long getBeginMillisOfDay(long millis)
Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date(millis));
calendar.set(Calendar.HOUR_OF_DAY, 0);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 0);
return calendar.getTimeInMillis();
/**
* 获取时间戳戳是星期几
*
* @param date
* @return 当前日期是星期几
*/
public String getWeekOfDate(Date date)
String[] weekDays = "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六";
Calendar cal = Calendar.getInstance();
cal.setTime(date);
int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
if (w < 0)
w = 0;
// log.info(" ", cal.get(Calendar.DAY_OF_WEEK), w, weekDays[w]);
return weekDays[w];
/**
* 获取时间戳是星期几
*
* @param
* @return
*/
public static int getIntWeekOfDate(long millis)
Calendar cal = Calendar.getInstance();
cal.setTime(new Date(millis));
return cal.get(Calendar.DAY_OF_WEEK);
/**
* 获取时间戳属于当月的哪天
*
* @param millis
* @return
*/
public static Integer getDayOfMonth(long millis)
Calendar cal = Calendar.getInstance();
cal.setTime(new Date(millis));
int w = cal.get(Calendar.DAY_OF_MONTH);
return w;
/**
* 获取年月日
*
* @param epochSecond
* @return
*/
public static String getYmd(Long epochSecond)
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
return sdf.format(new Date(epochSecond));
/**
* 获取年月
*
* @param millis
* @return
*/
public static String getYm(Long millis)
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMM");
return sdf.format(new Date(millis));
/**
* 获取上月月末的时间戳
*
* @param epochSecond
* @return
*/
public static long getLastMonthMills(Long epochSecond)
SimpleDateFormat sdf = new SimpleDateFormat(Y_M_D);
Calendar cale = Calendar.getInstance();
if (epochSecond != null && epochSecond != 0L)
Date date = new Date();
date.setTime(epochSecond);
cale.setTime(date);
int firstDay = cale.getActualMinimum(Calendar.DAY_OF_MONTH);//获取月最小天数
cale.set(Calendar.DAY_OF_MONTH, firstDay);//设置日历中月份的最小天数
return cale.getTimeInMillis() - ONEDAYMILLIS;
/**
* 获取某个月的月初日期
*
* @param epochSecond
* @return
*/
public static String getMonthFirstDay(Long epochSecond)
SimpleDateFormat sdf = new SimpleDateFormat(Y_M_D);
Calendar cale = Calendar.getInstance();
if (epochSecond != null && epochSecond != 0L)
Date date = new Date();
date.setTime(epochSecond);
cale.setTime(date);
int firstDay = cale.getActualMinimum(Calendar.DAY_OF_MONTH);//获取月最小天数
cale.set(Calendar.DAY_OF_MONTH, firstDay);//设置日历中月份的最小天数
return sdf.format(cale.getTime());
/**
* 获取某个月的月末日期
*
* @param epochSecond
* @return
*/
public static String getMonthLastDay(Long epochSecond)
SimpleDateFormat sdf = new SimpleDateFormat(Y_M_D);
Calendar cale = Calendar.getInstance();
if (epochSecond != null && epochSecond != 0L)
Date date = new Date();
date.setTime(epochSecond);
cale.setTime(date);
int lastDay = cale.getActualMaximum(Calendar.DAY_OF_MONTH);//获取月最大天数
cale.set(Calendar.DAY_OF_MONTH, lastDay);//设置日历中月份的最大天数
return sdf.format(cale.getTime());
/**
* 获取day所在月，月初日期
*
* @param day
* @return
*/
public static String getMonthFirstDay(String day, String pattern) throws ParseException
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
Calendar cale = Calendar.getInstance();
Date date = sdf.parse(day);
cale.setTime(date);
int firstDay = cale.getActualMinimum(Calendar.DAY_OF_MONTH);//获取月最小天数
cale.set(Calendar.DAY_OF_MONTH, firstDay);//设置日历中月份的最小天数
return sdf.format(cale.getTime());
/**
* 获取day所在月，月末日期
*
* @param day
* @return
*/
public static String getMonthLastDay(String day, String pattern) throws ParseException
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
Calendar cale = Calendar.getInstance();
Date date = sdf.parse(day);
cale.setTime(date);
int lastDay = cale.getActualMaximum(Calendar.DAY_OF_MONTH);//获取月最大天数
cale.set(Calendar.DAY_OF_MONTH, lastDay);//设置日历中月份的最大天数
return sdf.format(cale.getTime());
/**
* 根据星期获取日期
*
* @param week 星期几 1代码星期日，2代表星期一。。。7代表星期六
* @return
*/
public static Date getDateByWeek(int week)
int targetWeek = week;
Calendar c = Calendar.getInstance();
// 当前日期星期数
int currWeek = c.get(Calendar.DAY_OF_WEEK);
do
if (currWeek == targetWeek)
// 如果所给星期数和当前日期星期数相等则向后推7天
c.add(Calendar.DAY_OF_MONTH, 7);
else if (currWeek < week)
currWeek--;
while (currWeek != targetWeek);
return c.getTime();
/**
* 根据年月获取月末最后一天日期
*
* @param year
* @param month
* @return
*/
public static String getLastDay(int year, int month, String format)
Calendar cale = Calendar.getInstance();
cale.set(Calendar.YEAR, year);//赋值年份
cale.set(Calendar.MONTH, month - 1);//赋值月份
int lastDay = cale.getActualMaximum(Calendar.DAY_OF_MONTH);//获取月最大天数
cale.set(Calendar.DAY_OF_MONTH, lastDay);//设置日历中月份的最大天数
SimpleDateFormat sdf = new SimpleDateFormat(format); //格式化日期yyyy-MM-dd
String lastDayOfMonth = sdf.format(cale.getTime());
return lastDayOfMonth;
/**
* 获取某月的第一天
*
* @param timeSecs 时间戳13位ms
* @param format 格式化字符串
* @return
*/
public static String getFirstDay(Long timeSecs, String format)
Calendar cale = Calendar.getInstance();
if (timeSecs != null && timeSecs != 0L)
Date date = new Date();
date.setTime(timeSecs);
cale.setTime(date);
int lastDay = cale.getActualMinimum(Calendar.DAY_OF_MONTH);//获取月最大天数
cale.set(Calendar.DAY_OF_MONTH, lastDay);//设置日历中月份的最大天数
SimpleDateFormat sdf = new SimpleDateFormat(format);//格式化日期yyyy-MM-dd
String lastDayOfMonth = sdf.format(cale.getTime());
return lastDayOfMonth;
/**
* 根据年月获取月初第一天日期
*
* @param year 年
* @param month 月
* @param format 格式化日期
* @return
*/
public static String getFirstDay(int year, int month, String format)
Calendar cale = Calendar.getInstance();
cale.set(Calendar.YEAR, year); //赋值年份
cale.set(Calendar.MONTH, month - 1);//赋值月份
int lastDay = cale.getActualMinimum(Calendar.DAY_OF_MONTH);//获取月最大天数
cale.set(Calendar.DAY_OF_MONTH, lastDay);//设置日历中月份的最大天数
SimpleDateFormat sdf = new SimpleDateFormat(format);//格式化日期yyyy-MM-dd
String lastDayOfMonth = sdf.format(cale.getTime());
return lastDayOfMonth;
/**
* 获取某月的最后一天
*
* @param timeSecs 时间戳12位毫秒
* @param format 格式化日期
* @return
*/
public static String getLastDay(Long timeSecs, String format)
Calendar cale = Calendar.getInstance();
if (timeSecs != null && timeSecs != 0L)
Date date = new Date();
date.setTime(timeSecs);
cale.setTime(date);
int lastDay = cale.getActualMaximum(Calendar.DAY_OF_MONTH);//获取月最大天数
cale.set(Calendar.DAY_OF_MONTH, lastDay);//设置日历中月份的最大天数
SimpleDateFormat sdf = new SimpleDateFormat(format);//格式化日期yyyy-MM-dd
String lastDayOfMonth = sdf.format(cale.getTime());
return lastDayOfMonth;
/**
* 根据日期获取周
*
* @param date
* @return 45
*/
public static int getWeek(Date date)
GregorianCalendar g = new GregorianCalendar();
g.setTime(date);
return g.get(Calendar.WEEK_OF_YEAR); //获得周数
/**
* 根据日期获取年+周
*
* @param day 20221103
* @return 202245
*/
public static String getWeek(String day) throws ParseException
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(YMD);
Date date = simpleDateFormat.parse(day);
GregorianCalendar g = new GregorianCalendar();
g.setTime(date);
// g.get(Calendar.WEEK_OF_YEAR); //获得周数
return day.substring(0, 4) + g.get(Calendar.WEEK_OF_YEAR);
/**
* 日期格式化
*/
public static String format(Calendar c, String pattern)
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