package test;
import java.text.DateFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* @author ljb
* @version 1.0 2015-07-10
*/
public class DateTools {
/**
* 国际标准
* 一周是从 周日开始计算
*/
public static int WEEK_OF_ISO = 0;
/**
* 中国标准
* 一周是重周一开始计算
*/
public static int WEEK_OF_GBK = 1;
private int local_GMP = DateTools.WEEK_OF_GBK;
/**
* 构造函数默认的每周是从 周一到周日
*/
public DateTools() {
}
/**
* 构造函数
*
* @param GMP 标准类型 WEEK_OF_GBK中国标准 WEEK_OF_ISO国际标准
*/
public DateTools(int GMP) {
this.local_GMP = GMP;
}
/**
* 获得当前时间并且以String类型返回。
*
* @return 返回的时间格式yyyyMMddHHmmss。
*/
public String getDate() {
return getDate("yyyyMMddHHmmss");
}
/**
* 获得当前时间。时间格式根据fmt进行格式化
*
* @param fmt 日期格式
* @return 返回的时间格式根据fmt格式生成
*/
public String getDate(String fmt) {
Date myDate = new Date(System.currentTimeMillis());
SimpleDateFormat sDateformat = new SimpleDateFormat(fmt);
return sDateformat.format(myDate).toString();
}
private Calendar getCal(String strdate, String fmt) {
Calendar cal = null;
try {
if ((strdate != null) && (fmt != null)) {
SimpleDateFormat nowDate = new SimpleDateFormat(fmt);
Date d = nowDate.parse(strdate, new ParsePosition(0));
if (d != null) {
cal = Calendar.getInstance();
cal.clear();
cal.setTime(d);
}
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
return cal;
}
/**
* 计算 当前日期是本年的第几周
*
* @param strdate 计算日期
* @param fmt 日期格式
* @return strdate说在年份中有几周，如果strdate的格式为yyyy则默认为当年的1月1日
*/
public int getWeekOfYear(String strdate, String fmt) {
int ret = -1;
try {
if ((strdate != null) && (fmt != null)) {
Calendar cal = getCal(strdate, fmt);
if (cal != null) {
ret = cal.get(Calendar.WEEK_OF_YEAR);
if (this.local_GMP == DateTools.WEEK_OF_GBK && cal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) {
ret -= 1;
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return ret;
}
/**
* 计算给定日期所在周的全部日期
*
* @param strdate 指定日期
* @param oldfmt 自定日期格式
* @param newfmt 输出格式
* @return 结果数组形式输出所在周的日期。指定日期的格式为yyyy或yyyyMM将计算出当年第一周或当月第一周的日期
*/
public String[] getWeekDay(String strdate, String oldfmt, String newfmt) {
String[] weekday = new String[7];
try {
if ((strdate != null) && (oldfmt != null) && (newfmt != null)) {
Calendar cal = getCal(strdate, oldfmt);
if (cal != null) {
int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK);
dayOfWeek = -dayOfWeek + 1 + this.local_GMP;
if (dayOfWeek > 0) {
dayOfWeek = -6;
}
cal.add(Calendar.DATE, dayOfWeek);
SimpleDateFormat sdf = new SimpleDateFormat(newfmt);
weekday[0] = sdf.format(cal.getTime());
for (int i = 1; i < 7; i++) {
cal.add(5, 1);
weekday[i] = sdf.format(cal.getTime());
}
}
}
} catch (IndexOutOfBoundsException iobe) {
iobe.printStackTrace();
}
return weekday;
}
/**
* 计算给定周内的全部日期
*
* @param year 年
* @param week 给定第几周 * @param newfmt * 返回值格式 * @return 结果数组形式输出所在周的日期。
*/
public String[] getWeekDate(String year, int week, String newfmt) {
String[] jweekday = new String[7];
try {
if ((year != null) && (year.length() == 4) && (week > 0) && (newfmt != null)) {
Calendar cal = getCal(year + "0101", "yyyyMMdd");
if (cal != null) {
week--;
cal.add(5, week * 7 - cal.get(7) + 2);
SimpleDateFormat sdf = new SimpleDateFormat(newfmt);
jweekday[0] = sdf.format(cal.getTime());
for (int i = 1; i < 7; i++) {
cal.add(5, 1);
jweekday[i] = sdf.format(cal.getTime());
}
}
}
} catch (IndexOutOfBoundsException iobe) {
iobe.printStackTrace();
}
return jweekday;
}
/**
* 计算指定日期是星期几 * * @param strdate * 指定日期 * @param oldfmt * 指定日期格式 * @param fmt * 输出格式 * @return 返回结果为fmt+结果。
*/
public String getDayOfWeek(String strdate, String oldfmt, String fmt) {
String sWeek = null;
try {
if ((strdate != null) && (oldfmt != null) && (fmt != null)) {
Calendar cal = getCal(strdate, oldfmt);
if (cal != null) {
int iWeek = cal.get(7);
sWeek = fmt + (iWeek - 1 == 0 ? 7 : iWeek - 1);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return sWeek;
}
/**
* 计算指定年共有多少周 * * @param year * 指定年 格式yyyy * @return 返回周数
*/
public int getWeekNum(String year) {
int weeknum = -1;
try {
if (year != null) {
Calendar cal = getCal(year + "1231", "yyyyMMdd");
if (cal != null) {
if (cal.get(3) == 1) cal.add(5, -7);
weeknum = cal.get(3);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return weeknum;
}
/**
* 计算两个给定的时间之差 * * @param startdate * 开始日期 * @param enddate * 结束日期 * @param fmt * 日期格式 * @param refmt * 返回值格式 ms毫秒 s秒 m分 h小时 d天 * @return 返回值
*/
public String cntTimeDifference(String startdate, String enddate, String fmt, String refmt) {
String ret = null;
try {
if ((startdate != null) && (enddate != null) && (fmt != null) && (refmt != null)) {
Date scal = getCal(startdate, fmt).getTime();
Date ecal = getCal(enddate, fmt).getTime();
if ((scal == null) || (ecal == null)) {
return null;
} else {
long diffMillis = ecal.getTime() - scal.getTime();
long diffSecs = diffMillis / 1000L;
long diffMins = diffMillis / 60000L;
long diffHours = diffMillis / 3600000L;
long diffDays = diffMillis / 86400000L;
if (refmt.equals("ms")) ret = Long.toString(diffMillis);
else if (refmt.equals("s")) ret = Long.toString(diffSecs);
else if (refmt.equals("m")) ret = Long.toString(diffMins);
else if (refmt.equals("h")) ret = Long.toString(diffHours);
else if (refmt.equals("d")) ret = Long.toString(diffDays);
else ret = Long.toString(diffHours);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return ret;
}
/**
* 计算指定日期经过多少分钟后的日期 * * @param deftime * 自定日期 * @param oldfmt * 日期格式 * @param timediff * 分钟为单位 * @param newfmt * 返回值的格式 * @return 返回日期，timediff >0向前计算，timediff<0向后计算
*/
public String getBeforeTime(String deftime, String oldfmt, int timediff, String newfmt) {
String rq = null;
try {
if ((deftime != null) && (!deftime.equals(""))) {
Calendar cal = getCal(deftime, oldfmt);
if (cal != null) {
cal.add(Calendar.MINUTE, -timediff);
SimpleDateFormat sdf = new SimpleDateFormat(newfmt);
rq = sdf.format(cal.getTime());
}
}
} catch (Exception e) {
e.printStackTrace();
}
return rq;
}
/**
* 计算指定日期经过多少小时后的日期 * * @param deftime * 自定日期 * @param oldfmt * 日期格式 * @param timediff * 小时为单位 * @param newfmt * 返回值的格式 * @return 返回日期，timediff >0向前计算，timediff<0向后计算
*/
public String getBeforeTimeByH(String deftime, String oldfmt, int timediff, String newfmt) {
String rq = null;
try {
if ((deftime != null) && (!deftime.equals(""))) {
Calendar cal = getCal(deftime, oldfmt);
if (cal != null) {
cal.add(12, -timediff * 60);
SimpleDateFormat sdf = new SimpleDateFormat(newfmt);
rq = sdf.format(cal.getTime());
}
}
} catch (Exception e) {
e.printStackTrace();
}
return rq;
}
/**
* 计算指定日期经过多少月后的日期 * * @param deftime * 自定日期 * @param oldfmt * 日期格式 * @param timediff * 月为单位 * @param newfmt * 返回值的格式 * @return 返回日期，timediff >0向前计算，timediff<0向后计算
*/
public String getBeforeTimeByM(String deftime, String oldfmt, int timediff, String newfmt) {
String rq = null;
try {
if ((deftime != null) && (!deftime.equals(""))) {
Calendar cal = getCal(deftime, oldfmt);
if (cal != null) {
cal.add(2, -timediff);
SimpleDateFormat sdf = new SimpleDateFormat(newfmt);
rq = sdf.format(cal.getTime());
}
}
} catch (Exception e) {
e.printStackTrace();
}
return rq;
}
/**
* 日期格式化 * * @param mydate * 日期 * @param oldfmt * 旧格式 * @param newfmt * 新格式 * @return 返回值的格式根据newfmt根式返回
*/
public String fmtDate(String mydate, String oldfmt, String newfmt) {
String restr = null;
try {
if ((mydate != null) && (oldfmt != null) && (newfmt != null)) {
SimpleDateFormat newDate = new SimpleDateFormat(newfmt);
Calendar cal = getCal(mydate, oldfmt);
if (cal != null) {
restr = newDate.format(cal.getTime());
}
}
} catch (Exception e) {
e.printStackTrace();
}
return restr;
}
/**
* 将文字行的date格式成Date类型 * @param mydate * @param fmt * @return
*/
public Date fmtDate(String myDate, String fmt) {
Date newDate = null;
if ((myDate != null) && (fmt != null)) {
Calendar cal = getCal(myDate, fmt);
newDate = cal.getTime();
}
return newDate;
}
public String fmtDate(Date myDate, String fmt) {
String newDate = "";
SimpleDateFormat sDateformat = new SimpleDateFormat(fmt);
newDate = sDateformat.format(myDate).toString();
return newDate;
}
public String fmtDate(Long myDate, String fmt) {
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(myDate);
DateFormat formatter = new SimpleDateFormat(fmt);
return formatter.format(calendar.getTime());
} /*public static void main(String[] args){ DateTools dt = new DateTools(); System.out.print(dt.fmtDate(1462878420000l,"yyyy-MM-dd HH:mm:ss")); }*/
/**
* 计算某年某月有多少天 * @param year * @return
*/
public int getMonthDays(int year, int month) {
if (month > 12 || month < 1) {
throw new RuntimeException("month is error " + month);
}
String bigmonth = "1,3,5,7,8,10,12";
String smallmonth = "4,6,9,11";
if (bigmonth.indexOf(month + "") > -1) {
return 31;
}
if (smallmonth.indexOf(month + "") > -1) {
return 30;
}
if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)) {
return 29;
} else {
return 28;
}
}
}
