Android开发中日期工具类DateUtil完整实例

/**
* 日期操作工具类.
* @Project  ERPForAndroid
* @Package  com.ymerp.android.tools
* @author   chenlin
* @version  1.0
*/
@SuppressLint("SimpleDateFormat")
public class DateUtil {
private static final String FORMAT = "yyyy-MM-dd HH:mm:ss";
private static final SimpleDateFormat datetimeFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
private static final SimpleDateFormat timeFormat = new SimpleDateFormat("HH:mm:ss");
public static Date str2Date(String str) {
return str2Date(str, null);
}
/**
* 字符串转时间
* @param str
* @param format
* @return
*/
public static Date str2Date(String str, String format) {
if (str == null || str.length() == 0) {
return null;
}
if (format == null || format.length() == 0) {
format = FORMAT;
}
Date date = null;
try {
SimpleDateFormat sdf = new SimpleDateFormat(format);
date = sdf.parse(str);
} catch (Exception e) {
e.printStackTrace();
}
return date;
}
public static Calendar str2Calendar(String str) {
return str2Calendar(str, null);
}
public static Calendar str2Calendar(String str, String format) {
Date date = str2Date(str, format);
if (date == null) {
return null;
}
Calendar c = Calendar.getInstance();
c.setTime(date);
return c;
}
public static String date2Str(Calendar c) {// yyyy-MM-dd HH:mm:ss
return date2Str(c, null);
}
public static String date2Str(Calendar c, String format) {
if (c == null) {
return null;
}
return date2Str(c.getTime(), format);
}
public static String date2Str(Date d) {// yyyy-MM-dd HH:mm:ss
return date2Str(d, null);
}
public static String date2Str(Date d, String format) {// yyyy-MM-dd HH:mm:ss
if (d == null) {
return null;
}
if (format == null || format.length() == 0) {
format = FORMAT;
}
SimpleDateFormat sdf = new SimpleDateFormat(format);
String s = sdf.format(d);
return s;
}
public static String getCurDateStr() {
Calendar c = Calendar.getInstance();
c.setTime(new Date());
return c.get(Calendar.YEAR) + "-" + (c.get(Calendar.MONTH) + 1) + "-" + c.get(Calendar.DAY_OF_MONTH) + "-"
+ c.get(Calendar.HOUR_OF_DAY) + ":" + c.get(Calendar.MINUTE) + ":" + c.get(Calendar.SECOND);
}
/**
* 获得当前日期的字符串格式
*
* @param format
* @return
*/
public static String getCurDateStr(String format) {
Calendar c = Calendar.getInstance();
return date2Str(c, format);
}
/**
* 格式到秒
*
* @param time
* @return
*/
public static String getMillon(long time) {
return new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(time);
}
/**
* 格式到天
*
* @param time
* @return
*/
public static String getDay(long time) {
return new SimpleDateFormat("yyyy-MM-dd").format(time);
}
/**
* 格式到毫秒
*
* @param time
* @return
*/
public static String getSMillon(long time) {
return new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss-SSS").format(time);
}
/**
* 字符串转换到时间格式
*
* @param dateStr
*      需要转换的字符串
* @param formatStr
*      需要格式的目标字符串 举例 yyyy-MM-dd
* @return Date 返回转换后的时间
* @throws ParseException
*       转换异常
*/
public static Date StringToDate(String dateStr, String formatStr) {
DateFormat sdf = new SimpleDateFormat(formatStr);
Date date = null;
try {
date = sdf.parse(dateStr);
} catch (ParseException e) {
e.printStackTrace();
}
return date;
}
/**
* 转化时间输入时间与当前时间的间隔
*
* @param timestamp
* @return
*/
public static String converTime(long timestamp) {
long currentSeconds = System.currentTimeMillis() / 1000;
long timeGap = currentSeconds - timestamp;// 与现在时间相差秒数
String timeStr = null;
if (timeGap   24 * 60 * 60) {// 1天以上
timeStr = timeGap / (24 * 60 * 60) + "天前";
} else if (timeGap   60 * 60) {// 1小时-24小时
timeStr = timeGap / (60 * 60) + "小时前";
} else if (timeGap   60) {// 1分钟-59分钟
timeStr = timeGap / 60 + "分钟前";
} else {// 1秒钟-59秒钟
timeStr = "刚刚";
}
return timeStr;
}
/**
* 把字符串转化为时间格式
*
* @param timestamp
* @return
*/
public static String getStandardTime(long timestamp) {
SimpleDateFormat sdf = new SimpleDateFormat("MM月dd日 HH:mm");
Date date = new Date(timestamp * 1000);
sdf.format(date);
return sdf.format(date);
}
/**
* 获得当前日期时间 日期时间格式yyyy-MM-dd HH:mm:ss
*
* @return
*/
public static String currentDatetime() {
return datetimeFormat.format(now());
}
/**
* 格式化日期时间 日期时间格式yyyy-MM-dd HH:mm:ss
*
* @return
*/
public static String formatDatetime(Date date) {
return datetimeFormat.format(date);
}
/**
* 获得当前时间 时间格式HH:mm:ss
*
* @return
*/
public static String currentTime() {
return timeFormat.format(now());
}
/**
* 格式化时间 时间格式HH:mm:ss
*
* @return
*/
public static String formatTime(Date date) {
return timeFormat.format(date);
}
/**
* 获得当前时间的<code java.util.Date</code 对象
*
* @return
*/
public static Date now() {
return new Date();
}
public static Calendar calendar() {
Calendar cal = GregorianCalendar.getInstance(Locale.CHINESE);
cal.setFirstDayOfWeek(Calendar.MONDAY);
return cal;
}
/**
* 获得当前时间的毫秒数
*
* 详见{@link System#currentTimeMillis()}
*
* @return
*/
public static long millis() {
return System.currentTimeMillis();
}
/**
*
* 获得当前Chinese月份
*
* @return
*/
public static int month() {
return calendar().get(Calendar.MONTH) + 1;
}
/**
* 获得月份中的第几天
*
* @return
*/
public static int dayOfMonth() {
return calendar().get(Calendar.DAY_OF_MONTH);
}
/**
* 今天是星期的第几天
*
* @return
*/
public static int dayOfWeek() {
return calendar().get(Calendar.DAY_OF_WEEK);
}
/**
* 今天是年中的第几天
*
* @return
*/
public static int dayOfYear() {
return calendar().get(Calendar.DAY_OF_YEAR);
}
/**
* 判断原日期是否在目标日期之前
*
* @param src
* @param dst
* @return
*/
public static boolean isBefore(Date src, Date dst) {
return src.before(dst);
}
/**
* 判断原日期是否在目标日期之后
*
* @param src
* @param dst
* @return
*/
public static boolean isAfter(Date src, Date dst) {
return src.after(dst);
}
/**
* 判断两日期是否相同
*
* @param date1
* @param date2
* @return
*/
public static boolean isEqual(Date date1, Date date2) {
return date1.compareTo(date2) == 0;
}
/**
* 判断某个日期是否在某个日期范围
*
* @param beginDate
*      日期范围开始
* @param endDate
*      日期范围结束
* @param src
*      需要判断的日期
* @return
*/
public static boolean between(Date beginDate, Date endDate, Date src) {
return beginDate.before(src) && endDate.after(src);
}
/**
* 获得当前月的最后一天
*
* HH:mm:ss为0，毫秒为999
*
* @return
*/
public static Date lastDayOfMonth() {
Calendar cal = calendar();
cal.set(Calendar.DAY_OF_MONTH, 0); // M月置零
cal.set(Calendar.HOUR_OF_DAY, 0);// H置零
cal.set(Calendar.MINUTE, 0);// m置零
cal.set(Calendar.SECOND, 0);// s置零
cal.set(Calendar.MILLISECOND, 0);// S置零
cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) + 1);// 月份+1
cal.set(Calendar.MILLISECOND, -1);// 毫秒-1
return cal.getTime();
}
/**
* 获得当前月的第一天
*
* HH:mm:ss SS为零
*
* @return
*/
public static Date firstDayOfMonth() {
Calendar cal = calendar();
cal.set(Calendar.DAY_OF_MONTH, 1); // M月置1
cal.set(Calendar.HOUR_OF_DAY, 0);// H置零
cal.set(Calendar.MINUTE, 0);// m置零
cal.set(Calendar.SECOND, 0);// s置零
cal.set(Calendar.MILLISECOND, 0);// S置零
return cal.getTime();
}
private static Date weekDay(int week) {
Calendar cal = calendar();
cal.set(Calendar.DAY_OF_WEEK, week);
return cal.getTime();
}
/**
* 获得周五日期
*
* 注：日历工厂方法{@link #calendar()}设置类每个星期的第一天为Monday，US等每星期第一天为sunday
*
* @return
*/
public static Date friday() {
return weekDay(Calendar.FRIDAY);
}
/**
* 获得周六日期
*
* 注：日历工厂方法{@link #calendar()}设置类每个星期的第一天为Monday，US等每星期第一天为sunday
*
* @return
*/
public static Date saturday() {
return weekDay(Calendar.SATURDAY);
}
/**
* 获得周日日期 注：日历工厂方法{@link #calendar()}设置类每个星期的第一天为Monday，US等每星期第一天为sunday
*
* @return
*/
public static Date sunday() {
return weekDay(Calendar.SUNDAY);
}
/**
* 将字符串日期时间转换成java.util.Date类型 日期时间格式yyyy-MM-dd HH:mm:ss
*
* @param datetime
* @return
*/
public static Date parseDatetime(String datetime) throws ParseException {
return datetimeFormat.parse(datetime);
}
/**
* 将字符串日期转换成java.util.Date类型 日期时间格式yyyy-MM-dd
*
* @param date
* @return
* @throws ParseException
*/
public static Date parseDate(String date) throws ParseException {
return dateFormat.parse(date);
}
/**
* 将字符串日期转换成java.util.Date类型 时间格式 HH:mm:ss
*
* @param time
* @return
* @throws ParseException
*/
public static Date parseTime(String time) throws ParseException {
return timeFormat.parse(time);
}
/**
* 根据自定义pattern将字符串日期转换成java.util.Date类型
*
* @param datetime
* @param pattern
* @return
* @throws ParseException
*/
public static Date parseDatetime(String datetime, String pattern) throws ParseException {
SimpleDateFormat format = (SimpleDateFormat) datetimeFormat.clone();
format.applyPattern(pattern);
return format.parse(datetime);
}
/**
* 把秒格式化为分种小时
*
* @param second
* @return
*/
public static String parseSecond(int second) {
if (second  = 60) {
return second / 60 + "分";
} else if (second  = 60 * 60) {
return second / 60 * 60 + "时";
} else if (second  = 60 * 60 * 24) {
return second / 60 * 60 + "天";
} else {
return second + "秒";
}
}
/**
* 比较时间大小
* @param begin
* @param end
* @return
*/
public static int compareDate(String begin, String end) {
DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm");
try {
Date beginDate = df.parse(begin);
Date endDate = df.parse(end);
if (beginDate.getTime() < endDate.getTime()) {
return 1;
} else if (beginDate.getTime()   endDate.getTime()) {
return -1;
} else {
return 0;
}
} catch (Exception exception) {
exception.printStackTrace();
}
return 0;
}
/**
* 获得年份
* @param date
* @return
*/
public int getYear(Date date){
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.YEAR);
}
/**
* 获得月份
* @param date
* @return
*/
public int getMonth(Date date){
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.MONTH) + 1;
}
/**
* 获得星期几
* @param date
* @return
*/
public int getWeek(Date date){
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.WEEK_OF_YEAR);
}
/**
* 获得日期
* @param date
* @return
*/
public int getDay(Date date){
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.DATE);
}
/**
* 获得天数差
* @param begin
* @param end
* @return
*/
public long getDayDiff(Date begin, Date end){
long day = 1;
if(end.getTime() < begin.getTime()){
day = -1;
}else if(end.getTime() == begin.getTime()){
day = 1;
}else {
day += (end.getTime() - begin.getTime())/(24 * 60 * 60 * 1000) ;
}
return day;
}
}