Java中的日期常用格式化
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2022-05-25 15:01:19
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import java.sql.Timestamp; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.GregorianCalendar; import java.util.Locale; import org.apache.log4j.Logger; public class Time { public static Logger logger=Logger.getLogger(Time.class); public static GregorianCalendar ggcalendar=new GregorianCalendar(Locale.CHINA); /** * * @param datestr * @return yyyy-MM-dd hh:mm:ss * @throws ParseException */ public static Date switchToyMdhms(String datestr) { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); java.util.Date nowtime=null; try { if(datestr.trim().length()<11) { datestr=datestr.trim()+" 00:00:00"; } nowtime = df.parse(datestr); nowtime = new java.sql.Timestamp(nowtime.getTime()); } catch (ParseException e) { logger.info(e); } return nowtime; } /** * * @param datestr * @return yyyy-MM-dd * @throws ParseException */ public static Date switchToyMd(String datestr) throws ParseException { Date nowtime=null; SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd"); nowtime = df.parse(datestr); nowtime = new java.sql.Date(nowtime.getTime()); return nowtime; } /** * * @return yyyy-MM-dd * @throws ParseException */ public static Date getsystimeyMd() throws ParseException { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String date2 = df.format(new Date()); java.util.Date nowtime =null; nowtime= df.parse(date2); nowtime= new java.sql.Date(nowtime.getTime()); return nowtime; } /** * * @return yyyy-MM-dd hh:mm:ss * @throws ParseException */ public static Date getsystimeyMdhms() { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String date2 = df.format(new Date()); java.util.Date nowtime =null; try { nowtime= df.parse(date2); } catch (ParseException e) { logger.info(e); } nowtime= new java.sql.Timestamp(nowtime.getTime()); return nowtime; } /** * * @return yyyy-MM-dd hh:mm:ss * @throws ParseException */ public static Date getTodayStart() { SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd 00:00"); String date2 = df.format(new Date()); java.util.Date nowtime =null; try { nowtime= df.parse(date2); } catch (ParseException e) { logger.info(e); } nowtime= new java.sql.Timestamp(nowtime.getTime()); return nowtime; } /** * * @return yyyy-MM-dd hh:mm:ss * @throws ParseException */ public static Date getTodayEnd() throws ParseException { return switchToyMdhms(getsystimeyMd().toString()+" 23:59:59"); } /** * * @param date * @return Stringyyyy-MM-dd */ public static String getFormatYYMMDD(Date date){ if(date==null) return ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); return sdf.format(date); } /*** * 将Timestamp类型的数据转换成字符串 * @param date * @return */ public static String getFormatYYYYMMDDHHMMSSS(Timestamp date){ // SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");//hh:am/pm 中的小时数(1-12) SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//HH:一天中的小时数(0-23) return df.format(date); } public static String getFormatYYMMDD(){ Date date=new Date(); if(date==null) return ""; SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd"); return sdf.format(date); } /** * 返回当前的年 * @return */ public static Integer year(){ return ggcalendar.get(Calendar.YEAR); } /** * 返回当前月份 * @return */ public static Integer month(){ return ggcalendar.get(Calendar.MONTH)+1; } /** * 返回当前是几号 * @return */ public static Integer date(){ return ggcalendar.get(Calendar.DATE); } public static void main(String[] args) throws ParseException { /* Time.getsystimeyMd(); Time.getsystimeyMdhms(); Time.switchToyMd("2009-12-10"); Time.switchToyMdhms("2008-02-02 13:25:03");*/ System.out.println(Time.year().toString()+Time.month().toString()+Time.date().toString()); Timestamp a=new Timestamp(new Date().getTime()); SimpleDateFormat df1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); System.out.println(df1.format(a)); SimpleDateFormat df = new SimpleDateFormat("E MM月dd日"); String date = df.format(a); System.out.println(date); Calendar cal = Calendar.getInstance(); cal.setTimeInMillis(a.getTime()); cal.add(Calendar.DATE, 1); System.out.println(df.format(cal.getTime())); cal.add(Calendar.DATE, 1); System.out.println(df.format(cal.getTime())); cal.add(Calendar.DATE, 1); System.out.println(df.format(cal.getTime())); cal.add(Calendar.DATE, 1); System.out.println(df.format(cal.getTime())); cal.add(Calendar.DATE, 1); System.out.println(df.format(cal.getTime())); cal.add(Calendar.DATE, 1); System.out.println(df.format(cal.getTime())); System.out.println((new SimpleDateFormat("E")).format(cal.getTime())); } }