public class FormatDateUtil { public FormatDateUtil () { } // set the date format static public String FormatDateTime () { // get the current time a Date DATE = new new a Date (); // DateFormat the format the SimpleDateFormat new new = ( "the MM-dd-YYYY" ); DateFormat the format = new new the SimpleDateFormat ( " YYYY the mM-dd-HH: mm: SS " ); return format.format (DATE); } static public String formatDateTime2 () { // get the current time Date date =new Date(); DateFormat format = new SimpleDateFormat("yyyy-MM-dd"); // DateFormat format=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); return format.format(date); } // 设置日期格式,返回Date类型 static public Date formatDate() throws ParseException { Date date = new Date(); DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String time = format.format(date); SDF the SimpleDateFormat = new new the SimpleDateFormat ( " YYYY the MM-dd-HH: mm: SS " ); Date DATE2 = sdf.parse (Time); return DATE2; } // a string (format) Date Date Date into static public string fomatDate (string dateTime) {throws a ParseException the SimpleDateFormat SDF = new new the SimpleDateFormat ( " YYYY the mM-dd-HH: mm: SS " ); // passed string argument format and the same must be a Date DATE = SDF. the parse (dateTime); DateFormat the format = new newThe SimpleDateFormat ( " YYYY the MM-dd-HH: mm: SS " ); return format.format (DATE); } // a string (format) Date Date Date into static public String fomatDate31 (String dateTime) throws a ParseException { the SimpleDateFormat SDF = new new the SimpleDateFormat ( " YYYY-the MM-dd " ); // passed string argument format and the same must be a Date DATE = sdf.parse (dateTime); DateFormat the format = new new the SimpleDateFormat ( " YYYY- dd-the MM " ); returnformat.format (DATE); } // a string (format) Date Date Date into static public String fomatDate3 (String dateTime) {throws a ParseException the SimpleDateFormat SDF = new new the SimpleDateFormat ( " YYYY-the MM-dd " ); / / incoming format string parameters and the same must be a Date DATE = sdf.parse (dateTime); DateFormat the format = new new the SimpleDateFormat ( " YYYY the mM-dd-HH: mm: SS " ); return format.format (DATE ); } // a string (format) date date date into static public Date fomatDate2(String dateTime) throws ParseException { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");// 传入的字符串参数的格式一定要与此相同 Date date = sdf.parse(dateTime); return date; } // 将一个字符串(格式化)日期转化为Date日期 static public Date fomatDate4(String dateTime) throws ParseException { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// 传入的字符串参数的格式一定要与此相同 Date date = sdf.parse(dateTime); return date; } // 格式化日期为字符串 "yyyy-MM-dd hh:mm" static public String formatDateTime(Date basicDate, String strFormat) { SimpleDateFormat df = new SimpleDateFormat(strFormat); return df.format(basicDate); } // 格式化日期为字符串 "yyyy-MM-dd hh:mm" static public String formatDateTime(String basicDate, String strFormat) { SimpleDateFormat df = new SimpleDateFormat(strFormat); Date tmpDate = null; try { tmpDate = df.parse(basicDate); } catch (Exception e) { // 日期型字符串格式错误 } return df.format(tmpDate); } // 当前日期加减n天后的日期,返回String (yyyy-mm-dd) static public String nDaysAftertoday(int n) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); Calendar rightNow = Calendar.getInstance(); // rightNow.add(Calendar.DAY_OF_MONTH,-1); rightNow.add(Calendar.DAY_OF_MONTH, +n); return df.format(rightNow.getTime()); } // 当前日期加减n天后的日期,返回String (yyyy-mm-dd) static public Date nDaysAfterNowDate(int n) { Calendar rightNow = Calendar.getInstance(); // rightNow.add(Calendar.DAY_OF_MONTH,-1); rightNow.add(Calendar.DAY_OF_MONTH, +n); return rightNow.getTime(); } // 给定一个日期型字符串,返回加减n天后的日期型字符串 static public String nDaysAfterOneDateString(String basicDate, int n) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); Date tmpDate = null; try { tmpDate = df.parse(basicDate); } catch (Exception e) { // 日期型字符串格式错误 } long nDay = (tmpDate.getTime() / (24 * 60 * 60 * 1000) + 1 + n) * (24 * 60 * 60 * 1000); tmpDate.setTime(nDay); return df.format(tmpDate); } // 给定一个日期型字符串,返回加n小时后的日期型字符串 static public String nHoursAfterOneDateString(String basicDate, int n) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date tmpDate = null; try { tmpDate = df.parse(basicDate); } catch (Exception e) { // 日期型字符串格式错误 } long nDay = (tmpDate.getTime() / (60 * 60 * 1000) + n) * (60 * 60 * 1000); tmpDate.setTime(nDay); return df.format(tmpDate); } // 给定一个日期型字符串,返回减n小时后的日期型字符串 static public String nHoursBeforeOneDateString(String basicDate, int n) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date tmpDate = null; try { tmpDate = df.parse(basicDate); } catch (Exception e) { // 日期型字符串格式错误 } long nDay = (tmpDate.getTime() / (60 * 60 * 1000) - n) * (60 * 60 * 1000); tmpDate.setTime(nDay); return df.format(tmpDate); } // 给定一个日期,返回加减n天后的日期 static public Date nDaysAfterOneDate(Date basicDate, int n) { long nDay = (basicDate.getTime() / (24 * 60 * 60 * 1000) + 1 + n) * (24 * 60 * 60 * 1000); basicDate.setTime(nDay); return basicDate; } // 计算两个日期相隔的天数 static public int nDaysBetweenTwoDate(Date firstDate, Date secondDate) { int nDay = (int) ((secondDate.getTime() - firstDate.getTime()) / (24 * 60 * 60 * 1000)); return nDay; } // 计算两个日期相隔的天数 static public int nDaysBetweenTwoDate(String firstString, String secondString) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); Date firstDate = null; Date secondDate = null; try { firstDate = df.parse(firstString); secondDate = df.parse(secondString); } catch (Exception e) { // 日期型字符串格式错误 } int nDay = (int) ((secondDate.getTime() - firstDate.getTime()) / (24 * 60 * 60 * 1000)); return nDay; } // 计算两个日期相隔的小时数数 static public int nHoursBetweenTwoDate(String firstString, String secondString) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date firstDate = null; Date secondDate = null; try { firstDate = df.parse(firstString); secondDate = df.parse(secondString); } catch (Exception e) { // 日期型字符串格式错误 } int nDay = (int) ((secondDate.getTime() - firstDate.getTime()) / (60 * 60 * 1000)); return nDay; } }