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How to delete some character from respone in Java?

I have some string respone date like this:
2018-11-30 12:00:00
and i want just get the time, so i want like this:
12.00
and my question, can we delete some character like that?

Sounds like you want to use SimpleDateFormat so something like:
Date today = Calendar.getInstance().getTime();
SimpleDateFormat formatter = new SimpleDateFormat("hh.mm");
String folderName = formatter.format(today);
Based on your comment try:
int index = time.indexOf(‘:’);
int start = index -2;
int end = index + 2;
String newTime = time.substring(start,end);

String apiDateString = "2018-11-30 12:00:00"; // in this case, your string from api
Date apiDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(apiDateString); // convert api date string to date
SimpleDateFormat formatter = new SimpleDateFormat("hh.mm");
String yourDateString = formatter.format(apiDate);
I think you want this.
Edited with little comment.
convert string to date. (apiDateString to apiDate)
create new format for what you want to form. In this case, 12.00
convert apiDate to your format. (apiDate -> 12.00)

You can try this
Calendar calendar = Calendar.getInstance();
SimpleDateFormat mdformat = new SimpleDateFormat("HH:mm:ss");
String strDate = "Current Time : " + mdformat.format(calendar.getTime());
display(strDate);

You can use SimpleDateFormat to get time and then replace : by .
I hope it can help your problem!

You can refer to this post.
Use SimpleDateFormat to format you date.
From String to Date
// Convert from string to date
String yourDate = "2018-11-30 12:00:00";
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date = format.parse(yourDate);
//Use calender instead of date to getHours and minute, due to deprecated
Calendar calendar = GregorianCalendar.getInstance();
calendar.setTime(date);
calendar.get(Calendar.HOUR);
calendar.get(Calendar.MINUTE);
System.out.println(calendar.get(Calendar.HOUR_OF_DAY)+"."+calendar.get(Calendar.MINUTE)); //12.0

Date to Unix timestamp

I have a string that looks like "2015-06-07 16:01:33.0". I want to convert it into a unix timestamp. First I use Calendar utility to convert it into a Date object. How can I convert the date to epoch time?
String origintime = "2015-06-07 16:01:33.0";
String year = origintime.split(" ")[0].split("-")[0];
String month = origintime.split(" ")[0].split("-")[1];
String day = origintime.split(" ")[0].split("-")[2];
String hour = origintime.split(" ")[1].split(":")[0];
String mins = origintime.split(" ")[1].split(":")[1];
String secs = origintime.split(" ")[1].split(":")[2].replace(".0","");
Calendar cal = Calendar.getInstance();
cal.set(Calendar.DAY_OF_MONTH, Integer.parseInt(day));
cal.set(Calendar.MONTH, Integer.parseInt(month));
cal.set(Calendar.YEAR, Integer.parseInt(year));
cal.set(Calendar.HOUR_OF_DAY,Integer.parseInt(hour));
cal.set(Calendar.MINUTE,Integer.parseInt(mins));
cal.set(Calendar.SECOND,Integer.parseInt(secs));
String strdate = null;
SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-dd HH:mm:ss");
if (cal != null) {
strdate = sdf.format(cal.getTime());
}
System.out.println(strdate);

I think you can search for answers at StackOverflow, instead of posting a new question, since it make StackOverflow better, I just did a quick search and here they are:
Getting unix timestamp from Date()
or here is the code that straight forward:
Date currentDate = new Date();
currentDate.getTime() / 1000;
Recently, people prefer jodaTime:
DateTime dateTime = new DateTime();
long unix = dateTime.getMillis()/1000;

calender show results like date1<= results<date2

I used two calender for starting date and finishing as below,
date.Ic.add(Restrictions.between("islemZamani", date1, date2));
However result of this criteria has results of date1 and between of them,not include results of date2.I mean ,It shows date1<= results. I want date1<= results<=date2. So I tried SimpleDateFormat like this;
String tar1 = new String();
String tar2 = new String();
TimeZone tz = TimeZone.getTimeZone("Europe/Istanbul");
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSSZ");
dateFormat.setTimeZone(tz);
tar1 = dateFormat.format(date1);
tar2 = dateFormat.format(date2);
tar1 = tar1.substring(11, 18) + "000000";
tar2 = tar2.substring(11, 18) + "235959";
c.add(Restrictions.between("islemZamani", tar1, tar2));
Now It gives NullPointerException.How can i solve this problem? Do you suggest any different way from SimpleDateFormat? Thanka for any reply.

Use a string to manipulate date is too complicated and may case a loooot of problems.
Use only java.util.Date and/or java.util.GregorianCalendar.
Try this :
GregorianCalendar calendar1 = new GregorianCalendar();
calendar1.setTime(date1);
// Edit the calendar1 here if you want to
GregorianCalendar calendar2 = new GregorianCalendar();
calendar2.setTime(date2);
calendar2.add(GregorianCalendar.DAY_OF_YEAR, 1);
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSSZ");
TimeZone tz = TimeZone.getTimeZone("Europe/Istanbul");
dateFormat.setTimeZone(tz);
String tar1 = dateFormat.format(calendar1.getTime());
String tar2 = dateFormat.format(calendar2.getTime());
c.add(Restrictions.between("islemZamani", tar1, tar2));
But without the trace, I'm not sure this will solve your problem...
And, if it's possible, use the date instead of the string in your restriction.

Incrementing date in yyyymmddhhmmss.mmm format in Java

I want to increment the milliseconds in any given date in the format yyyymmddhhmmss.mmm in each iteration. mmm here represents milliseconds. And I want to perfom this operation in Java 1.5.
For example: 20120823151034.567 should be incremented to 20120823151034.568

You can use long milli-seconds which make incrementing trivial.
final String input = "20120823151034.567";
final DateFormat df = new SimpleDateFormat("yyyyMMddHHmmss.SSS");
Date d = df.parse(input);
d.setTime(d.getTime()+1);
System.out.println(df.format(d));
I wouldn't use Calendar as its very slow.

You can parse String to Date object and use getTime() and setTime(long l) to modify date. Then you can convert Date object back to String. For parsing String and converting Date object back to String you can use SimpleDateFormat class.

The best class to use for this operation is Calendar. You set it to the desired date, and then use
myCalendar.add(Calendar.MILLISECOND, 1);
to advance it by one millisecond. Use DateFormat to produce string representations.

This gives you what you want. It will work across any day/month/year boundary, as well as handling the start and end of daylight saving time.
final String input = "20120823151034.567";
final DateFormat df = new SimpleDateFormat("yyyyMMddHHmmss.SSS");
final Calendar c = Calendar.getInstance();
c.setTime(df.parse(input));
c.add(Calendar.MILLISECOND, 1);
System.out.println(df.format(c.getTime()));

You can use Calendar Class as well as Date Class for this....
Date Class:
final String dateStr = "20120823151034.567";
final DateFormat format = new SimpleDateFormat("yyyyMMddHHmmss.SSS");
Date date = format.parse(input);
date.setTime(date.getTime()+1);
System.out.println(format.format(date));
Calendar Class:
final String dateStr = "20120823151034.567";
final DateFormat format = new SimpleDateFormat("yyyyMMddHHmmss.SSS");
Calendar c = Calendar.getInstance();
c.setTime(format.parse(dateStr ));
c.add(Calendar.MILLISECOND,1);
System.out.println(format.format(c.getTime()));
In both cases, format.parse() has the potential to throw a ParseException, which you will need to catch and handle.

An alternative without using Calendar (although, Calendar is fine)
final String input = "20120814120000.111";
final DateFormat format = new SimpleDateFormat("yyyyMMddHHmmss.SSS");
Date date = new format.parse(input);
long time = date.getTime();
Date incrementedDate = new Date(time + 1);
System.out.println(format.format(date));

Convert date to XMLGregorianCalendar

I have a date in the following format in UI..
Eg: Thu. 03/01
I convert them to XMLGregorianCalendar as below explained.
final DateFormat format = new SimpleDateFormat("E. M/d");
final String dateStr = closeDate;
final Date dDate = format.parse(dateStr);
GregorianCalendar gregory = new GregorianCalendar();
gregory.setTime(dDate);
XMLGregorianCalendar dealCloseDate = DatatypeFactory.newInstance()
.newXMLGregorianCalendar(gregory);
My Output is "3/06/70 05:00 AM" instead of "3/06/2011 05:00 AM". What is the chnage required to get the proper year.

You didn't mention anything about how the year is supposed to be represented in this date conversion, but here is some pseudocode to get you started. Note that I don't explicitly deal with the timezone in this example:
final DateFormat format = new SimpleDateFormat("E. M/d");
final String dateStr = "Thu. 03/01";
final Date date = format.parse(dateStr);
GregorianCalendar gregory = new GregorianCalendar();
gregory.setTime(date);
XMLGregorianCalendar calendar = DatatypeFactory.newInstance()
.newXMLGregorianCalendar(
gregory);

I did the following code to achieve the same. May be a lengthy code but is working fine.
def gregorianCalendar = new GregorianCalendar()
def xmlGregorianCalendar = newInstance().newXMLGregorianCalendar(gregorianCalendar)
if (//past date is needed) {
def date = xmlGregorianCalendar.toGregorianCalendar().time
def cal = Calendar.getInstance()
cal.setTime(date)
cal.add(Calendar.DATE,-3); //subtract 3 days
date.setTime(cal.getTime().getTime())
gregorianCalendar.setTime(date)
xmlGregorianCalendar = newInstance().newXMLGregorianCalendar(gregorianCalendar)
}