java中string与date(日期)格式之间…

1.string格式转化为Date对象：

//把string转化为dateDateFormat fmt =newSimpleDateFormat(“yyyy-MM-dd”);Date date = fmt.parse(szBeginTime);test.setStartTime(date);

注意：引入的是：java.text.DateFormat

2.Date格式转化为String对象：

SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd”);String startTime = sdf.format(startTime);

Java时间格式转换大全import java.text.*;import java.util.Calendar;public class VeDate {public static Date getNowDate() { Date currentTime = newDate(); SimpleDateFormat formatter =new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); String dateString =formatter.format(currentTime); ParsePosition pos = newParsePosition(8); Date currentTime_2 =formatter.parse(dateString, pos); return currentTime_2;}DateFormat format1 = new SimpleDateFormat(“yyyy-MM-dd”); DateFormat format 2= new SimpleDateFormat(“yyyy年MM月dd日 HH时mm分ss秒”); Date date = null; String str = null; // String转Date str = “2007-1-18”; try { date =format1.parse(str); data =format2.parse(str);} catch (ParseException e) { e.printStackTrace(); } public static String getStringDate() { Date currentTime = newDate(); SimpleDateFormat formatter =new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); String dateString =formatter.format(currentTime); return dateString;}public static String getStringDateShort() { Date currentTime = newDate(); SimpleDateFormat formatter =new SimpleDateFormat(“yyyy-MM-dd”); String dateString =formatter.format(currentTime); return dateString;}public static String getTimeShort() { SimpleDateFormat formatter =new SimpleDateFormat(“HH:mm:ss”); Date currentTime = newDate(); String dateString =formatter.format(currentTime); return dateString;}public static Date strToDateLong(String strDate) { SimpleDateFormat formatter =new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); ParsePosition pos = newParsePosition(0); Date strtodate =formatter.parse(strDate, pos); return strtodate;}public static String dateToStrLong(java.util.Date dateDate) { SimpleDateFormat formatter =new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); String dateString =formatter.format(dateDate); return dateString;}public static String dateToStr(java.util.Date dateDate) { SimpleDateFormat formatter =new SimpleDateFormat(“yyyy-MM-dd”); String dateString =formatter.format(dateDate); return dateString;}public static Date strToDate(String strDate) { SimpleDateFormat formatter =new SimpleDateFormat(“yyyy-MM-dd”); ParsePosition pos = newParsePosition(0); Date strtodate =formatter.parse(strDate, pos); return strtodate;}public static Date getNow() { Date currentTime = newDate(); return currentTime;}public static Date getLastDate(long day) { Date date = new Date(); long date_3_hm =date.getTime() – 3600000 * 34 * day; Date date_3_hm_date = newDate(date_3_hm); return date_3_hm_date;}public static String getStringToday() { Date currentTime = newDate(); SimpleDateFormat formatter =new SimpleDateFormat(“yyyyMMdd HHmmss”); String dateString =formatter.format(currentTime); return dateString;}public static String getHour() { Date currentTime = newDate(); SimpleDateFormat formatter =new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); String dateString =formatter.format(currentTime); String hour; hour =dateString.substring(11, 13); return hour;}public static String getTime() { Date currentTime = newDate(); SimpleDateFormat formatter =new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); String dateString =formatter.format(currentTime); String min; min = dateString.substring(14,16); return min;}public static String getUserDate(String sformat) { Date currentTime = newDate(); SimpleDateFormat formatter =new SimpleDateFormat(sformat); String dateString =formatter.format(currentTime); return dateString;}——————————————————————————————————————————–做成方法import java.util.*;import java.text.*;import java.util.Calendar;public class VeDate {public static Date getNowDate() { Date currentTime = new Date(); SimpleDateFormat formatter = newSimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); String dateString =formatter.format(currentTime); ParsePosition pos = new ParsePosition(8); Date currentTime_2 = formatter.parse(dateString,pos); return currentTime_2;}public static Date getNowDateShort() { Date currentTime = new Date(); SimpleDateFormat formatter = newSimpleDateFormat(“yyyy-MM-dd”); String dateString =formatter.format(currentTime); ParsePosition pos = new ParsePosition(8); Date currentTime_2 = formatter.parse(dateString,pos); return currentTime_2;}public static String getStringDate() { Date currentTime = new Date(); SimpleDateFormat formatter = newSimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); String dateString =formatter.format(currentTime); return dateString;}public static String getStringDateShort() { Date currentTime = new Date(); SimpleDateFormat formatter = newSimpleDateFormat(“yyyy-MM-dd”); String dateString =formatter.format(currentTime); return dateString;}public static String getTimeShort() { SimpleDateFormat formatter = newSimpleDateFormat(“HH:mm:ss”); Date currentTime = new Date(); String dateString =formatter.format(currentTime); return dateString;}public static Date strToDateLong(String strDate){ SimpleDateFormat formatter = newSimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); ParsePosition pos = new ParsePosition(0); Date strtodate = formatter.parse(strDate,pos); return strtodate;}public static String dateToStrLong(java.util.DatedateDate) { SimpleDateFormat formatter = newSimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); String dateString =formatter.format(dateDate); return dateString;}public static String dateToStr(java.util.DatedateDate) { SimpleDateFormat formatter = newSimpleDateFormat(“yyyy-MM-dd”); String dateString =formatter.format(dateDate); return dateString;}public static Date strToDate(String strDate){ SimpleDateFormat formatter = newSimpleDateFormat(“yyyy-MM-dd”); ParsePosition pos = new ParsePosition(0); Date strtodate = formatter.parse(strDate,pos); return strtodate;}public static Date getNow() { Date currentTime = new Date(); return currentTime;}public static Date getLastDate(long day) { Date date = new Date(); long date_3_hm = date.getTime() – 3600000 * 34 *day; Date date_3_hm_date = new Date(date_3_hm); return date_3_hm_date;}public static String getStringToday() { Date currentTime = new Date(); SimpleDateFormat formatter = newSimpleDateFormat(“yyyyMMdd HHmmss”); String dateString =formatter.format(currentTime); return dateString;}public static String getHour() { Date currentTime = new Date(); SimpleDateFormat formatter = newSimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); String dateString =formatter.format(currentTime); String hour; hour = dateString.substring(11, 13); return hour;}public static String getTime() { Date currentTime = new Date(); SimpleDateFormat formatter = newSimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); String dateString =formatter.format(currentTime); String min; min = dateString.substring(14, 16); return min;}public static String getUserDate(String sformat){ Date currentTime = new Date(); SimpleDateFormat formatter = newSimpleDateFormat(sformat); String dateString =formatter.format(currentTime); return dateString;}public static String getTwoHour(String st1,String st2) { String[] kk = null; String[] jj = null; kk = st1.split(“:”); jj = st2.split(“:”); if (Integer.parseInt(kk[0]) <Integer.parseInt(jj[0])) return “0”; else { double y =Double.parseDouble(kk[0]) + Double.parseDouble(kk[1]) / 60; double u =Double.parseDouble(jj[0]) + Double.parseDouble(jj[1]) / 60; if ((y – u) > 0) return y – u + “”; else return “0”; }}public static String getTwoDay(String sj1, Stringsj2) { SimpleDateFormat myFormatter = newSimpleDateFormat(“yyyy-MM-dd”); long day = 0; try { java.util.Date date =myFormatter.parse(sj1); java.util.Date mydate =myFormatter.parse(sj2); day = (date.getTime() -mydate.getTime()) / (24 * 60 * 60 * 1000); } catch (Exception e) { return “”; } return day + “”;}public static String getPreTime(String sj1,String jj) { SimpleDateFormat format = newSimpleDateFormat(“yyyy-MM-dd HH:mm:ss”); String mydate1 = “”; try { Date date1 =format.parse(sj1); long Time = (date1.getTime() /1000) + Integer.parseInt(jj) * 60; date1.setTime(Time *1000); mydate1 =format.format(date1); } catch (Exception e) { } return mydate1;}public static String getNextDay(String nowdate,String delay) { try{ SimpleDateFormat format = newSimpleDateFormat(“yyyy-MM-dd”); String mdate = “”; Date d = strToDate(nowdate); long myTime = (d.getTime() / 1000) +Integer.parseInt(delay) * 24 * 60 * 60; d.setTime(myTime * 1000); mdate = format.format(d); return mdate; }catch(Exception e){ return “”; }}public static boolean isLeapYear(String ddate){ Date d = strToDate(ddate); GregorianCalendar gc = (GregorianCalendar)Calendar.getInstance(); gc.setTime(d); int year = gc.get(Calendar.YEAR); if ((year % 400) == 0) return true; else if ((year % 4) == 0) { if ((year % 100) == 0) return false; else return true; } else return false;}public static String getEDate(String str) { SimpleDateFormat formatter = newSimpleDateFormat(“yyyy-MM-dd”); ParsePosition pos = new ParsePosition(0); Date strtodate = formatter.parse(str,pos); String j = strtodate.toString(); String[] k = j.split(” “); return k[2] + k[1].toUpperCase() +k[5].substring(2, 4);}public static String getEndDateOfMonth(Stringdat) {// yyyy-MM-dd String str = dat.substring(0, 8); String month = dat.substring(5, 7); int mon = Integer.parseInt(month); if (mon == 1 || mon == 3 || mon == 5 || mon == 7|| mon == 8 || mon == 10 || mon == 12) { str += “31”; } else if (mon == 4 || mon == 6 || mon == 9 ||mon == 11) { str += “30”; } else { if (isLeapYear(dat)) { str += “29”; } else { str += “28”; } } return str;}public static boolean isSameWeekDates(Date date1,Date date2) { Calendar cal1 = Calendar.getInstance(); Calendar cal2 = Calendar.getInstance(); cal1.setTime(date1); cal2.setTime(date2); int subYear = cal1.get(Calendar.YEAR) -cal2.get(Calendar.YEAR); if (0 == subYear) { if(cal1.get(Calendar.WEEK_OF_YEAR) ==cal2.get(Calendar.WEEK_OF_YEAR)) return true; } else if (1 == subYear && 11 ==cal2.get(Calendar.MONTH)) { //如果12月的最后一周横跨来年第一周的话则最后一周即算做来年的第一周 if(cal1.get(Calendar.WEEK_OF_YEAR) ==cal2.get(Calendar.WEEK_OF_YEAR)) return true; } else if (-1 == subYear && 11 ==cal1.get(Calendar.MONTH)) { if(cal1.get(Calendar.WEEK_OF_YEAR) ==cal2.get(Calendar.WEEK_OF_YEAR)) return true; } return false;}public static String getSeqWeek() { Calendar c =Calendar.getInstance(Locale.CHINA); String week =Integer.toString(c.get(Calendar.WEEK_OF_YEAR)); if (week.length() == 1) week = “0” + week; String year =Integer.toString(c.get(Calendar.YEAR)); return year + week;}public static String getWeek(String sdate, Stringnum) { // 再转换为时间 Date dd = VeDate.strToDate(sdate); Calendar c = Calendar.getInstance(); c.setTime(dd); if (num.equals(“1”)) // 返回星期一所在的日期 c.set(Calendar.DAY_OF_WEEK,Calendar.MONDAY); else if (num.equals(“2”)) // 返回星期二所在的日期 c.set(Calendar.DAY_OF_WEEK,Calendar.TUESDAY); else if (num.equals(“3”)) // 返回星期三所在的日期 c.set(Calendar.DAY_OF_WEEK,Calendar.WEDNESDAY); else if (num.equals(“4”)) // 返回星期四所在的日期 c.set(Calendar.DAY_OF_WEEK,Calendar.THURSDAY); else if (num.equals(“5”)) // 返回星期五所在的日期 c.set(Calendar.DAY_OF_WEEK,Calendar.FRIDAY); else if (num.equals(“6”)) // 返回星期六所在的日期 c.set(Calendar.DAY_OF_WEEK,Calendar.SATURDAY); else if (num.equals(“0”)) // 返回星期日所在的日期 c.set(Calendar.DAY_OF_WEEK,Calendar.SUNDAY); return newSimpleDateFormat(“yyyy-MM-dd”).format(c.getTime());}public static String getWeek(String sdate){ // 再转换为时间 Date date = VeDate.strToDate(sdate); Calendar c = Calendar.getInstance(); c.setTime(date); // int hour=c.get(Calendar.DAY_OF_WEEK); // hour中存的就是星期几了，其范围 1~7 // 1=星期日 7=星期六，其他类推 return newSimpleDateFormat(“EEEE”).format(c.getTime());}public static String getWeekStr(Stringsdate){ String str = “”; str = VeDate.getWeek(sdate); if(“1”.equals(str)){ str = “星期日”; }else if(“2”.equals(str)){ str = “星期一”; }else if(“3”.equals(str)){ str = “星期二”; }else if(“4”.equals(str)){ str = “星期三”; }else if(“5”.equals(str)){ str = “星期四”; }else if(“6”.equals(str)){ str = “星期五”; }else if(“7”.equals(str)){ str = “星期六”; } return str;}public static long getDays(String date1, Stringdate2) { if (date1 == null || date1.equals(“”)) return 0; if (date2 == null || date2.equals(“”)) return 0; // 转换为标准时间 SimpleDateFormat myFormatter = newSimpleDateFormat(“yyyy-MM-dd”); java.util.Date date = null; java.util.Date mydate = null; try { date =myFormatter.parse(date1); mydate =myFormatter.parse(date2); } catch (Exception e) { } long day = (date.getTime() – mydate.getTime()) /(24 * 60 * 60 * 1000); return day;}public static String getNowMonth(String sdate){ // 取该时间所在月的一号 sdate = sdate.substring(0, 8) + “01”; // 得到这个月的1号是星期几 Date date = VeDate.strToDate(sdate); Calendar c = Calendar.getInstance(); c.setTime(date); int u = c.get(Calendar.DAY_OF_WEEK); String newday = VeDate.getNextDay(sdate, (1 – u)+ “”); return newday;}public static String getNo(int k) { return getUserDate(“yyyyMMddhhmmss”) +getRandom(k);}public static String getRandom(int i) { Random jjj = new Random(); // int suiJiShu = jjj.nextInt(9); if (i == 0) return “”; String jj = “”; for (int k = 0; k < i; k++) { jj = jj +jjj.nextInt(9); } return jj;}public static boolean RightDate(String date){ SimpleDateFormat sdf = newSimpleDateFormat(“yyyy-MM-dd hh:mm:ss”); ; if (date == null) return false; if (date.length() > 10) { sdf = newSimpleDateFormat(“yyyy-MM-dd hh:mm:ss”); } else { sdf = newSimpleDateFormat(“yyyy-MM-dd”); } try { sdf.parse(date); } catch (ParseException pe) { return false; } return true;}public static String getStringDateMonth(Stringsdate, String nd, String yf, String rq, String format) { Date currentTime = new Date(); SimpleDateFormat formatter = newSimpleDateFormat(“yyyy-MM-dd”); String dateString =formatter.format(currentTime); String s_nd = dateString.substring(0, 4); //年份 String s_yf = dateString.substring(5, 7); //月份 String s_rq = dateString.substring(8, 10); //日期 String sreturn = “”; roc.util.MyChar mc = newroc.util.MyChar(); if (sdate == null || sdate.equals(“”) ||!mc.Isdate(sdate)) { // 处理空值情况 if (nd.equals(“1”)) { sreturn = s_nd; // 处理间隔符 if (format.equals(“1”)) sreturn =sreturn + “年”; else if(format.equals(“2”)) sreturn =sreturn + “-“; else if(format.equals(“3”)) sreturn =sreturn + “/”; else if(format.equals(“5”)) sreturn =sreturn + “.”; } // 处理月份 if (yf.equals(“1”)) { sreturn = sreturn +s_yf; if (format.equals(“1”)) sreturn =sreturn + “月”; else if(format.equals(“2”)) sreturn =sreturn + “-“; else if(format.equals(“3”)) sreturn =sreturn + “/”; else if(format.equals(“5”)) sreturn =sreturn + “.”; } // 处理日期 if (rq.equals(“1”)) { sreturn = sreturn +s_rq; if (format.equals(“1”)) sreturn =sreturn + “日”; } } else { //不是空值，也是一个合法的日期值，则先将其转换为标准的时间格式 sdate =roc.util.RocDate.getOKDate(sdate); s_nd = sdate.substring(0, 4);// 年份 s_yf = sdate.substring(5, 7);// 月份 s_rq = sdate.substring(8, 10);// 日期 if (nd.equals(“1”)) { sreturn = s_nd; // 处理间隔符 if (format.equals(“1”)) sreturn =sreturn + “年”; else if(format.equals(“2”)) sreturn =sreturn + “-“; else if(format.equals(“3”)) sreturn =sreturn + “/”; else if(format.equals(“5”)) sreturn =sreturn + “.”; } // 处理月份 if (yf.equals(“1”)) { sreturn = sreturn +s_yf; if (format.equals(“1”)) sreturn =sreturn + “月”; else if(format.equals(“2”)) sreturn =sreturn + “-“; else if(format.equals(“3”)) sreturn =sreturn + “/”; else if(format.equals(“5”)) sreturn =sreturn + “.”; } // 处理日期 if (rq.equals(“1”)) { sreturn = sreturn +s_rq; if (format.equals(“1”)) sreturn =sreturn + “日”; } } return sreturn;}public static String getNextMonthDay(Stringsdate, int m) { sdate = getOKDate(sdate); int year = Integer.parseInt(sdate.substring(0,4)); int month = Integer.parseInt(sdate.substring(5,7)); month = month + m; if (month < 0) { month = month + 12; year = year – 1; } else if (month > 12) { month = month – 12; year = year + 1; } String smonth = “”; if (month < 10) smonth = “0” + month; else smonth = “” + month; return year + “-” + smonth + “-10”;}public static String getOKDate(String sdate){ if (sdate == null || sdate.equals(“”)) returngetStringDateShort(); if (!VeStr.Isdate(sdate)) { sdate =getStringDateShort(); } // 将“/”转换为“-” sdate = VeStr.Replace(sdate, “/”, “-“); // 如果只有8位长度，则要进行转换 if (sdate.length() == 8) sdate = sdate.substring(0, 4)+ “-” + sdate.substring(4, 6) + “-” + sdate.substring(6, 8); SimpleDateFormat formatter = newSimpleDateFormat(“yyyy-MM-dd”); ParsePosition pos = new ParsePosition(0); Date strtodate = formatter.parse(sdate,pos); String dateString =formatter.format(strtodate); return dateString;}public static void main(String[] args) throwsException { try {//System.out.print(Integer.valueOf(getTwoDay(“2006-11-0312:22:10”, “2006-11-02 11:22:09”))); } catch (Exception e) { throw new Exception(); } //System.out.println(“sss”);}