Java regular implementation of various date formatting
- 2020-04-01 03:51:39
- OfStack
Java regular implementation of various date formatting
package com.st.test;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.regex.Pattern;
public class DateFormatUtil {
@SuppressWarnings("finally")
public static String FormatDate(String dateStr){
HashMap<String, String> dateRegFormat = new HashMap<String, String>();
dateRegFormat.put(
"^\d{4}\D+\d{1,2}\D+\d{1,2}\D+\d{1,2}\D+\d{1,2}\D+\d{1,2}\D*$",
"yyyy-MM-dd-HH-mm-ss");//March 12, 2014 13:534 seconds, 2014-03-12 12:05:34, 2014/3/12 12:5:34
dateRegFormat.put("^\d{4}\D+\d{2}\D+\d{2}\D+\d{2}\D+\d{2}$",
"yyyy-MM-dd-HH-mm");//2014-03-12 12:05
dateRegFormat.put("^\d{4}\D+\d{2}\D+\d{2}\D+\d{2}$",
"yyyy-MM-dd-HH");//2014-03-12 12
dateRegFormat.put("^\d{4}\D+\d{2}\D+\d{2}$", "yyyy-MM-dd");//2014-03-12
dateRegFormat.put("^\d{4}\D+\d{2}$", "yyyy-MM");//2014-03
dateRegFormat.put("^\d{4}$", "yyyy");//2014
dateRegFormat.put("^\d{14}$", "yyyyMMddHHmmss");//20140312120534
dateRegFormat.put("^\d{12}$", "yyyyMMddHHmm");//201403121205
dateRegFormat.put("^\d{10}$", "yyyyMMddHH");//2014031212
dateRegFormat.put("^\d{8}$", "yyyyMMdd");//20140312
dateRegFormat.put("^\d{6}$", "yyyyMM");//201403
dateRegFormat.put("^\d{2}\s*:\s*\d{2}\s*:\s*\d{2}$",
"yyyy-MM-dd-HH-mm-ss");//13:05:34 splice the current date
dateRegFormat.put("^\d{2}\s*:\s*\d{2}$", "yyyy-MM-dd-HH-mm");//13:05 splice the current date
dateRegFormat.put("^\d{2}\D+\d{1,2}\D+\d{1,2}$", "yy-MM-dd");//14.10.18(year, month, day)
dateRegFormat.put("^\d{1,2}\D+\d{1,2}$", "yyyy-dd-MM");//30.12(day. Month) splice the current year
dateRegFormat.put("^\d{1,2}\D+\d{1,2}\D+\d{4}$", "dd-MM-yyyy");//12.21.2013(sun, month, year)
String curDate =new SimpleDateFormat("yyyy-MM-dd").format(new Date());
DateFormat formatter1 =new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
DateFormat formatter2;
String dateReplace;
String strSuccess="";
try {
for (String key : dateRegFormat.keySet()) {
if (Pattern.compile(key).matcher(dateStr).matches()) {
formatter2 = new SimpleDateFormat(dateRegFormat.get(key));
if (key.equals("^\d{2}\s*:\s*\d{2}\s*:\s*\d{2}$")
|| key.equals("^\d{2}\s*:\s*\d{2}$")) {//13:05:34 or 13:05 splice the current date
dateStr = curDate + "-" + dateStr;
} else if (key.equals("^\d{1,2}\D+\d{1,2}$")) {//21.1 (day. Month) splice the current year
dateStr = curDate.substring(0, 4) + "-" + dateStr;
}
dateReplace = dateStr.replaceAll("\D+", "-");
// System.out.println(dateRegExpArr[i]);
strSuccess = formatter1.format(formatter2.parse(dateReplace));
break;
}
}
} catch (Exception e) {
System.err.println("----------------- Invalid date format :"+dateStr);
throw new Exception( " Invalid date format ");
} finally {
return strSuccess;
}
}
public static void main(String[] args) {
String[] dateStrArray=new String[]{
"2014-03-12 12:05:34",
"2014-03-12 12:05",
"2014-03-12 12",
"2014-03-12",
"2014-03",
"2014",
"20140312120534",
"2014/03/12 12:05:34",
"2014/3/12 12:5:34",
"2014 years 3 month 12 day 13 when 5 points 34 seconds ",
"201403121205",
"1234567890",
"20140312",
"201403",
"2000 13 33 13 13 13",
"30.12.2013",
"12.21.2013",
"21.1",
"13:05:34",
"12:05",
"14.1.8",
"14.10.18"
};
for(int i=0;i<dateStrArray.length;i++){
System.out.println(dateStrArray[i] +"------------------------------".substring(1,30-dateStrArray[i].length())+ FormatDate(dateStrArray[i]));
}
}
}
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