java Date常用操作方法
public class DateTool {
public static final String PATTERN_DEFAULT = "yyyy-MM-dd";
public static final String PATTERN_DAYPATH = "yyyy\\MM\\dd\\";
public static final String PATTERN_DATETIME = "yyyy-MM-dd HH:mm:ss";
public static final String PATTERN_DATETIME_COMPACT = "yyyyMMddHHmmss";
public static final String PATTERN_DATE_COMPACT = "yyyyMMdd";
public static final String PATTERN_DATESHORT = "yyMMdd";
public static final String PATTERN_YEARMONTH = "yyyyMM";
public static final String PATTERN_DATETIME_MILLISECOND = "yyyy-MM-dd HH:mm:ss.SSS";
private static final String MONTHS_STRING[] = { "Jan", "Feb", "Mar", "Apr",
"May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
/**
* 获取年份
*
* @param date
* @return
*/
public static int getYear(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.YEAR);
}
/**
* 获取月份
*
* @param date
* @return
*/
public static int getMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.MONTH) + 1;
}
/**
* 获取日份
*
* @param date
* @return
*/
public static int getDay(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.DAY_OF_MONTH);
}
/**
* 返回小时
*
* @param date
* @return
*/
public static int getHour(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.HOUR_OF_DAY);
}
/**
* 返回分钟
*
* @param date
* @return
*/
public static int getMinute(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.MINUTE);
}
/**
* 返回秒钟
*
* @param date
* @return
*/
public static int getSecond(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.SECOND);
}
/**
* 返回毫秒
*
* @param date
* @return
*/
public static long getMillis(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.getTimeInMillis();
}
/**
* 日期相加
*
* @param date
* @param day
* @return
*/
public static Date addDateWithDay(Date date, int day) {
Calendar c = Calendar.getInstance();
c.setTimeInMillis(getMillis(date) + ((long) day) * 24 * 3600 * 1000);
return c.getTime();
}
/**
* 日期相加
*
* @param date
* @param day
* @return
*/
public static Date addDateWithMilliSecond(Date date, long milliSecond) {
Calendar c = Calendar.getInstance();
c.setTimeInMillis(getMillis(date) + milliSecond);
return c.getTime();
}
/**
* 日期相减
*
* @param date1
* @param date2
* @return
*/
public static int diffDate(Date date1, Date date2) {
return (int) ((getMillis(date1) - getMillis(date2)) / (24 * 3600 * 1000));
}
/**
* 日期相减
*
* @param date1
* @param date2
* @return
*/
public static long diffDateInMillis(Date date1, Date date2) {
return (long) ((getMillis(date1) - getMillis(date2)));
}
/**
*
* 格式化日期对象
*
* @param date
*
* @return yyyy-MM-dd HH:mm:ss
*
*/
public static String getDateTimeStr(Date date) {
return formatDate(date, "yyyy-MM-dd HH:mm:ss");
}
/**
* 格式化日期对象
*
* @param date
*
* @return yyyy-MM-dd
*/
public static String getDateStr(Date date) {
return formatDate(date, "yyyy-MM-dd");
}
/**
* 获取当前日期时间字符串
*
* @return yyyy-MM-dd HH:mm:ss
*/
public static String getCurrentDateTime() {
return formatDate(new Date(), "yyyy-MM-dd HH:mm:ss");
}
/**
* 获取当前日期时间字符串
*
* @return yyyy-MM-dd
*/
public static String getCurrentDate() {
return formatDate(new Date(), "yyyy-MM-dd");
}
/**
* 将字符型日期时间转换为Date
*
* @param strDate
* yyyy-MM-dd HH:mm:ss
* @return
*/
public static Date getDateFromLongStr(String strDate) {
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
ParsePosition pos = new ParsePosition(0);
Date strtodate = formatter.parse(strDate, pos);
return strtodate;
}
/**
* 将字符型日期转换为Date
*
* @param strDate
* yyyy-MM-dd
*
* @return
*/
public static Date getDateFromStr(String strDate) {
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
ParsePosition pos = new ParsePosition(0);
Date strtodate = formatter.parse(strDate, pos);
return strtodate;
}
/**
* 获取指定日期所在年份一年的天数
*
* @param date
* 日期
*
* @return 返回 366或365
*/
public static int getYearDays(Date date) {
GregorianCalendar c = (GregorianCalendar) GregorianCalendar
.getInstance();
c.setTime(date);
return c.isLeapYear(c.get(1)) ? 366 : '\u016D';
}
/**
* 获取指定日期所在月份那月的天数
*
* @param date
* @return 返回date所在月份的天数
*/
public static int getMonthDays(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.getActualMaximum(5);
}
/**
* 比较两个日期时间是否相等，相等返回true，不等返回false
*
* @param date1
*
* @param date2
*
* @return
*/
public static boolean compareDateTime(Date date1, Date date2) {
return !date1.before(date2) && !date2.before(date1);
}
/**
* 比较两个日期的年月日是否相等，相等返回true，不等返回false
*
* @param date1
* @param date2
* @return
*/
public static boolean compareDay(Date date1, Date date2) {
Calendar cal1 = Calendar.getInstance();
cal1.setTime(date1);
Calendar cal2 = Calendar.getInstance();
cal2.setTime(date2);
return cal1.get(0) == cal2.get(0) && cal1.get(1) == cal2.get(1)
&& cal1.get(6) == cal2.get(6);
}
/**
* 将UTC格式的日期时间转换为Date类型
*
* @param date
* UTC格式的日期时间
* @return
*/
public static Date parseDateUTC(String date) {
date = date.substring(4);
date = date.replace("UTC 0800 ", "");
for (int i = 0; i < MONTHS_STRING.length; i++) {
if (!date.startsWith(MONTHS_STRING[i]))
continue;
date = date.replace(MONTHS_STRING[i], String.valueOf(i + 1));
break;
}
SimpleDateFormat df = new SimpleDateFormat("MM dd HH:mm:ss yyyy");
try {
return df.parse(date);
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}
/**
* 获取指定日期的最后时刻
*
* @param date
* @return yyyy-MM-dd 23:59:59
*/
public static String getEndDay(Date date) {
return (new StringBuilder(String.valueOf(getDateStr(date)))).append(
" 23:59:59").toString();
}
/**
*
* 格式化日期时间
*
* @param date
* 需要格式化的日期时间
* @param pattern
* 格式化形式，参考上面的静态常量
* @return
*/
public static String formatDate(Date date, String pattern) {
String result = "";
if (date != null) {
java.text.DateFormat df = new java.text.SimpleDateFormat(pattern);
result = df.format(date);
}
return result;
}
/**
* 将日期字符串转换为Date对象
*
* @param date
* 字符串
* @param pattern
* 格式
* @return
*/
public static Date parseDate(String date, String pattern) {
try {
return (new SimpleDateFormat(pattern)).parse(date);
} catch (ParseException e) {
e.printStackTrace();
return null;
}
}
/**
* 获取今年最后一天，返回字符串，格式为：2011-12-31
*
* @return
*/
public static String getEndOfYearStr() {
return (new StringBuilder(String.valueOf(Calendar.getInstance().get(1))))
.append("-12-31").toString();
}
/**
* 获取指定时间跟当前时间的间隔，返回中文描述
*
* @param time
* @return
* @throws Exception
*/
public static String getTimeDescription(java.util.Date time)
throws Exception {
long tt = System.currentTimeMillis() - time.getTime(); // 离现在的时间间隔
long t = tt / (3600 * 1000);
if (t > 24) {
String timeS = getDateTimeStr(time);
java.text.SimpleDateFormat df = new java.text.SimpleDateFormat(
"yyyy-MM-dd");
tt = df.parse(df.format(new java.util.Date())).getTime()
- df.parse(timeS.substring(0, 10)).getTime();
long d = tt / (24 * 3600 * 1000);
if (d >= 3) {
return timeS;
} else if (d == 2) {
return "前天";
} else {
return "昨天";
}
} else {
if (t > 0) {
return Long.toString(t) + "小时前";
} else {
t = tt / (60 * 1000);
if (t > 0) {
return Long.toString(t) + "分钟前";
} else {
return "刚刚";
}
}
}
}
}
