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Commonly used programming tasks in java
package com.venky.core.date;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import java.util.SimpleTimeZone;
import java.util.TimeZone;
public class DateUtils { // NOPMD by VMahadevan on 1/26/09 11:16 PM
public static long compareToMillis(final Date d1, final Date d2) {
return compareToMillis(d1.getTime(), d2.getTime());
}
public static int compareToMinutes(final Date d1, final Date d2) {
return compareToMinutes(d1.getTime(), d2.getTime());
}
public static long compareToMillis(final long millis1, final long millis2) {
return (millis1 - millis2);
}
public static int compareToMinutes(final long millis1, final long millis2) {
final long millisecondDiff = compareToMillis(millis1, millis2);
final double millisecondsInMinute = 60 * 1000;
final double diff = (millisecondDiff) / millisecondsInMinute;
return (int) Math.round(diff);
}
public static Date max(final Date d1, final Date d2) {
return (d1.compareTo(d2) < 0 ? d2 : d1);
}
public static Date min(final Date d1, final Date d2) {
return (d1.compareTo(d2) < 0 ? d1 : d2);
}
public static Date addHours(final Date to, final int hours) {
return new Date(addHours(to.getTime(), hours));
}
public static Date addMinutes(final Date to, final int minutes) {
return new Date(addMinutes(to.getTime(), minutes));
}
public static long addHours(final long to, final int hours) {
return (to + hours * 3600000L);
}
public static long addMinutes(final long to, final int minutes) {
return (to + minutes * 60000L);
}
public static long addSeconds(final long to, final int seconds) {
return (to + seconds * 1000L);
}
public static long addMillis(final long to, final long millis) {
return (to + millis);
}
public static Date addToDate(final Date to, final int field, final int amount) {
return new Date(addToMillis(to.getTime(), field, amount));
}
public static long addToMillis(final long to, final int field, final int amount) {
final Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(to);
cal.add(field, amount);
return cal.getTimeInMillis();
}
public static final String ISO_TIME_FORMAT_STR = "HH:mm:ss";
public static final DateFormat ISO_TIME_FORMAT = new SimpleDateFormat(ISO_TIME_FORMAT_STR,Locale.getDefault());
public static final String ISO_DATE_FORMAT_STR = "yyyy-MM-dd";
public static final DateFormat ISO_DATE_FORMAT = new SimpleDateFormat(ISO_DATE_FORMAT_STR,Locale.getDefault());
public static final String ISO_DATE_TIME_FORMAT_STR = "yyyy-MM-dd HH:mm:ss.SSS";
public static final DateFormat ISO_DATE_TIME_FORMAT = new SimpleDateFormat(ISO_DATE_TIME_FORMAT_STR,Locale.getDefault());
public static final String APP_TIME_FORMAT_STR = "HH:mm:ss";
public static final DateFormat APP_TIME_FORMAT = new SimpleDateFormat(APP_TIME_FORMAT_STR, Locale.getDefault());
public static final String APP_TIME_FORMAT_WITH_TZ_STR = "HH:mm:ss Z";
public static final DateFormat APP_TIME_FORMAT_WITH_TZ = new SimpleDateFormat(APP_TIME_FORMAT_WITH_TZ_STR, Locale.getDefault());
public static final String APP_DATE_TIME_FORMAT_STR = "dd/MM/yyyy HH:mm:ss";
public static final DateFormat APP_DATE_TIME_FORMAT = new SimpleDateFormat(APP_DATE_TIME_FORMAT_STR, Locale.getDefault());
public static final String APP_DATE_TIME_FORMAT_WITH_TZ_STR = "dd/MM/yyyy HH:mm:ss Z";
public static final DateFormat APP_DATE_TIME_FORMAT_WITH_TZ = new SimpleDateFormat(APP_DATE_TIME_FORMAT_WITH_TZ_STR, Locale.getDefault());
public static final String APP_DATE_FORMAT_STR = "dd/MM/yyyy";
public static final DateFormat APP_DATE_FORMAT = new SimpleDateFormat(APP_DATE_FORMAT_STR, Locale.getDefault());
public static final Date HIGH_DATE = getHighDate();
private static Date getHighDate() {
try {
return APP_DATE_TIME_FORMAT.parse("31/12/2999 12:59:59"); // NOPMD by VMahadevan on 1/26/09 11:12 PM
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static Date getStartOfDay(final Date date) {
return new Date(getStartOfDay(date.getTime()));
}
public static long getStartOfDay(final long date) {
final Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(date);
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();
}
public static long getEndOfDay(final long date) {
final Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(date);
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();
}
public static Date getEndOfDay(final Date date) {
return new Date(getEndOfDay(date.getTime()));
}
public static Date getTimeOfDay(final Date date, final String atTimeofDay) {
return getTimeOfDay(date, new Time(atTimeofDay));
}
public static Date getTimeOfDay(final Date date, final Time atTimeofDay) {
return new Date(getTimeOfDay(date.getTime(), atTimeofDay));
}
public static long getTimeOfDay(final long date, final Time atTimeofDay) {
try {
final Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(date);
calendar.set(Calendar.HOUR_OF_DAY, atTimeofDay.getHours());
calendar.set(Calendar.MINUTE, atTimeofDay.getMinutes());
calendar.set(Calendar.SECOND, atTimeofDay.getSeconds());
return calendar.getTimeInMillis();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static Date getDate(final String dateStr) {
try {
return APP_DATE_TIME_FORMAT_WITH_TZ.parse(dateStr);
} catch (ParseException e) {
}
try {
return APP_DATE_TIME_FORMAT.parse(dateStr);
} catch (ParseException e) {
}
try {
return ISO_DATE_TIME_FORMAT.parse(dateStr);
}catch (ParseException e){
}
try {
return APP_DATE_FORMAT.parse(dateStr);
} catch (ParseException e) {
}
try {
return ISO_DATE_FORMAT.parse(dateStr);
}catch (ParseException e){
}
throw new RuntimeException("Unknown Date Format");
}
public static Date getTime(String time) {
try {
return APP_TIME_FORMAT_WITH_TZ.parse(time);
} catch (ParseException ex) {
}
try {
return APP_TIME_FORMAT.parse(time);
} catch (ParseException ex) {
}
try {
return ISO_TIME_FORMAT.parse(time);
}catch (ParseException e){
}
throw new RuntimeException("Unknown Time Format");
}
public static String getTimeStr(final Date time) {
return getTimeStr(time, TimeZone.getDefault());
}
public static String getTimeStr(final Date time,TimeZone zone) {
return getTimestampStr(time, zone,APP_TIME_FORMAT_WITH_TZ);
}
public static String getDateStr(final Date date) {
return getTimestampStr(date, TimeZone.getDefault(),APP_DATE_FORMAT);
}
public static String getTimestampStr(final Date date){
return getTimestampStr(date,TimeZone.getDefault(),APP_DATE_TIME_FORMAT_WITH_TZ);
}
public static String getTimestampStr(final Date date,final String tz){
TimeZone zone = SimpleTimeZone.getTimeZone(tz);
return getTimestampStr(date,zone,APP_DATE_TIME_FORMAT_WITH_TZ);
}
public static String getTimestampStr(final Date inOneTimeZone, final TimeZone zone, DateFormat datefmt) {
DateFormat fmt = (DateFormat)datefmt.clone();
fmt.setTimeZone(zone);
return fmt.format(inOneTimeZone);
}
public static Date getDate(final Date inOneTimeZone, final String tz) {
final TimeZone zone = SimpleTimeZone.getTimeZone(tz);
final Calendar target = Calendar.getInstance(zone);
final Calendar cal = Calendar.getInstance();
cal.setTime(inOneTimeZone);
final int fromOffset = cal.get(Calendar.ZONE_OFFSET) + cal.get(Calendar.DST_OFFSET);
final int toOffset = target.get(Calendar.ZONE_OFFSET) + target.get(Calendar.DST_OFFSET);
final int diffOffset = toOffset - fromOffset;
cal.add(Calendar.MILLISECOND, diffOffset);
target.setTimeInMillis(cal.getTime().getTime());
return target.getTime();
}
}