This question already has answers here:
How to check if a date Object equals yesterday?
(9 answers)
Closed 8 years ago.
The following function produces today's date; how can I make it produce only yesterday's date?
private String toDate() {
DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
Date date = new Date();
return dateFormat.format(date).toString();
}
This is the output:
2012-07-10
I only need yesterday's date like below. Is it possible to do this in my function?
2012-07-09
Update
There has been recent improvements in datetime API with JSR-310.
Instant now = Instant.now();
Instant yesterday = now.minus(1, ChronoUnit.DAYS);
System.out.println(now);
System.out.println(yesterday);
https://ideone.com/91M1eU
Outdated answer
You are subtracting the wrong number:
Use Calendar instead:
private Date yesterday() {
final Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, -1);
return cal.getTime();
}
Then, modify your method to the following:
private String getYesterdayDateString() {
DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
return dateFormat.format(yesterday());
}
See
IDEOne Demo
You can do following:
private Date getMeYesterday(){
return new Date(System.currentTimeMillis()-24*60*60*1000);
}
Note: if you want further backward date multiply number of day with 24*60*60*1000 for example:
private Date getPreviousWeekDate(){
return new Date(System.currentTimeMillis()-7*24*60*60*1000);
}
Similarly, you can get future date by adding the value to System.currentTimeMillis(), for example:
private Date getMeTomorrow(){
return new Date(System.currentTimeMillis()+24*60*60*1000);
}
Calendar cal = Calendar.getInstance();
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
System.out.println("Today's date is "+dateFormat.format(cal.getTime()));
cal.add(Calendar.DATE, -1);
System.out.println("Yesterday's date was "+dateFormat.format(cal.getTime()));
Use Calender Api
Try this one:
private String toDate() {
DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
// Create a calendar object with today date. Calendar is in java.util pakage.
Calendar calendar = Calendar.getInstance();
// Move calendar to yesterday
calendar.add(Calendar.DATE, -1);
// Get current date of calendar which point to the yesterday now
Date yesterday = calendar.getTime();
return dateFormat.format(yesterday).toString();
}
Try this;
public String toDate() {
DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DATE, -1);
return dateFormat.format(cal.getTime());
}
changed from your code :
private String toDate(long timestamp) {
Date date = new Date (timestamp * 1000 - 24 * 60 * 60 * 1000);
return new SimpleDateFormat("yyyy-MM-dd").format(date).toString();
}
but you do better using calendar.
There is no direct function to get yesterday's date.
To get yesterday's date, you need to use Calendar by subtracting -1.
Calendar cal = Calendar.getInstance();
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
System.out.println("Today's date is "+dateFormat.format(cal.getTime()));
cal.add(Calendar.DATE, -1);
System.out.println("Yesterday's date was "+dateFormat.format(cal.getTime()));
Related
I have a weird problem I used Java to get a current date but I am getting different results on several devices, on one correct & on another wrong.
Here is my code:
public String getCurrentDate() {
/// get date
DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.ENGLISH);
dateFormat.setTimeZone(TimeZone.getTimeZone("Asia/Tehran"));
Date date = new Date();
System.out.println(dateFormat.format(date)); //2017-11-13 18:20:46 correct time is 11am
return dateFormat.format(date);
}
On the device that gives the wrong result I set automatic time zone use network-provided time zone & time of the device is correct.
Are testing with real devices?
You can also try the Calendar Class that are from Android. for more info visit (https://developer.android.com/reference/java/util/Calendar.html)
Check the Example bellow:
Calendar current_time_cal = Calendar.getInstance();
current_time_cal.setTimeZone(TimeZone.getTimeZone("Asia/Tehran"));
int hours = current_time.get(Calendar.HOUR);
int current_am_pm = current_time.get(Calendar.AM_PM);
current_time_cal.set(Calendar.HOUR_OF_DAY, (hours == 0)? 12 : hours);
current_time_cal.set(Calendar.MINUTE, current_time.get(Calendar.MINUTE));
current_time_cal.set(Calendar.SECOND, 0);
Try this:
Calendar c = Calendar.getInstance();
System.out.println("Current time: " + c.getTime());
SimpleDateFormat df = new SimpleDateFormat("dd-MMM-yyyy");
String formattedDate = df.format(c.getTime());
You can use this method to get current time from your device:
public String getCurrentDate() {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Calendar calendar = Calendar.getInstance();
String date = sdf.format(calendar.getTime());
return date;
}
This method will return current date as string.
How can i get String date from calendar?
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_MOUNTH, -5); //set now and 5 days to back
I want get String like this(date on interval -5 days to TODAY):
11.03.2015
10.03.2015
.
.
.
07.03.2015
It's possible? How?
you can use for loop and reduce one day from calendar instance and print it
Calendar calendar = Calendar.getInstance();
SimpleDateFormat dateFormat = new SimpleDateFormat("dd.MM.yyyy");
for (int index = 1; index <= 5; index++) {
calendar.add(Calendar.DATE, -1);
System.out.println(dateFormat.format(calendar.getTime()));
}
output:
10.03.2015
09.03.2015
08.03.2015
07.03.2015
06.03.2015
You should use the SimpleDateFormat class, as follows.
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_MOUNTH -5);
SimpleDateFormat myDateFormat = new SimpleDateFormat("MM.dd.yyyy"); //or ("dd.MM.yyyy"), If you want days before months.
String formattedDate = myDateFormat.format(cal.getTime());
Calendar cal = Calendar.getInstance();
Date date = cal.getTime();
Long beforeTime = date - (5*24*60*60*1000);
Date beforeDate = new Date(beforeTime);
SimpleDateFormat format = new SimpleDateFormat("dd.MM.yyyy");
String s = format.format(beforeDate);
s returns the date in your required format.
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy");
String strdate = sdf.format(calendardate.getTime());
I want to increment the date by one. I have the below code while running the code I am getting unparseable date finally I want the date as string in the format of MM-DD-YYYY.
But same program is working with the YYYY-MM-DD format but i want mydate in this format(MM-DD-YYYY)
String dt = schReq.getStartDate(); // Start date
SimpleDateFormat sdf = new SimpleDateFormat("MM-dd-yyyy");
Calendar c = Calendar.getInstance();
c.setTime(sdf.parse(dt));
c.add(Calendar.DATE, days); // number of days to add
dt = sdf.format(c.getTime());
schReq.setStartDate(dt);
Can anyone please help me?
The code should be working fine as long as dt and days are correct. This gave me 12-18-2014:
String dt = "12-17-2014"; // Start date
SimpleDateFormat sdf = new SimpleDateFormat("MM-dd-yyyy");
Calendar c = Calendar.getInstance();
c.setTime(sdf.parse(dt));
c.add(Calendar.DATE, 1); // number of days to add
dt = sdf.format(c.getTime());
You have to use two different DateFormats:
one for parsing the string and one for formatting.
String dt = schReq.getStartDate(); // Start date
SimpleDateFormat sdf_parser = new SimpleDateFormat("yyyy-MM-dd");
SimpleDateFormat sdf = new SimpleDateFormat("MM-dd-yyyy");
Calendar c = Calendar.getInstance();
c.setTime(sdf_parser.parse(dt));
c.add(Calendar.DATE, days); // number of days to add
dt = sdf.format(c.getTime());
schReq.setStartDate(dt);
This question already has answers here:
how to add days to java simple date format
(2 answers)
Closed 8 years ago.
I need to increment date by some days.
private Date now = new Date();
private Date result;
public void incrementDate(Integer days) {
result =
}
So if days equals 3 i need to increment my now date on 3 days and set it to result.
I know that java 8 has plusDays method in LocalDate class. Is there a way how to implement this in java 7.
Use Calendar
Calendar cal = Calendar.getInstance ();
cal.setTime (now);
cal.add (Calendar.DATE, days);
plus other fun stuff.
Use Calendar to do this:
Calendar cal = new GregorianCalendar();
cal.add(Calendar.DATE,3);
result = cal.getTime()
I suggest you make the function static and pass in now. return Date and use a Calendar. Something like,
public static Date incrementDate(Date now, int days) {
Calendar cal = Calendar.getInstance();
cal.setTime(now);
cal.add(Calendar.DAY_OF_MONTH, days);
return cal.getTime();
}
And then to test it
public static void main(String[] args) {
DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Date now = new Date();
System.out.println(df.format(now));
System.out.println(df.format(incrementDate(now, 3)));
}
Output here (today) is
2014-11-12
2014-11-15
try this code :
SimpleDateFormat sdf=new SimpleDateFormat("yyyy/MM/dd");
Calendar cal=Calendar.getInstance();
String today=sdf.format(cal.getTime());
System.out.println(today);
cal.add(Calendar.DATE, 20);
String After=sdf.format(cal.getTime());
System.out.println(After);
Date now = new Date();
I want to do something like:
Date date = new Date(); // current date
date = date - 300; // substract 300 days from current date and I want to use this "date"
How to do it?
Java 8 and later
With Java 8's date time API change, Use LocalDate
LocalDate date = LocalDate.now().minusDays(300);
Similarly you can have
LocalDate date = someLocalDateInstance.minusDays(300);
Refer to https://stackoverflow.com/a/23885950/260990 for translation between java.util.Date <--> java.time.LocalDateTime
Date in = new Date();
LocalDateTime ldt = LocalDateTime.ofInstant(in.toInstant(), ZoneId.systemDefault());
Date out = Date.from(ldt.atZone(ZoneId.systemDefault()).toInstant());
Java 7 and earlier
Use Calendar's add() method
Calendar cal = Calendar.getInstance();
cal.setTime(dateInstance);
cal.add(Calendar.DATE, -30);
Date dateBefore30Days = cal.getTime();
#JigarJoshi it's the good answer, and of course also #Tim recommendation to use .joda-time.
I only want to add more possibilities to subtract days from a java.util.Date.
Apache-commons
One possibility is to use apache-commons-lang. You can do it using DateUtils as follows:
Date dateBefore30Days = DateUtils.addDays(new Date(),-30);
Of course add the commons-lang dependency to do only date subtract it's probably not a good options, however if you're already using commons-lang it's a good choice. There is also convenient methods to addYears,addMonths,addWeeks and so on, take a look at the api here.
Java 8
Another possibility is to take advantage of new LocalDate from Java 8 using minusDays(long days) method:
LocalDate dateBefore30Days = LocalDate.now(ZoneId.of("Europe/Paris")).minusDays(30);
Simply use this to get date before 300 days, replace 300 with your days:
Date date = new Date(); // Or where ever you get it from
Date daysAgo = new DateTime(date).minusDays(300).toDate();
Here,
DateTime is org.joda.time.DateTime;
Date is java.util.Date
Java 8 Time API:
Instant now = Instant.now(); //current date
Instant before = now.minus(Duration.ofDays(300));
Date dateBefore = Date.from(before);
As you can see HERE there is a lot of manipulation you can do. Here an example showing what you could do!
DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
Calendar cal = Calendar.getInstance();
//Add one day to current date.
cal.add(Calendar.DATE, 1);
System.out.println(dateFormat.format(cal.getTime()));
//Substract one day to current date.
cal = Calendar.getInstance();
cal.add(Calendar.DATE, -1);
System.out.println(dateFormat.format(cal.getTime()));
/* Can be Calendar.DATE or
* Calendar.MONTH, Calendar.YEAR, Calendar.HOUR, Calendar.SECOND
*/
With Java 8 it's really simple now:
LocalDate date = LocalDate.now().minusDays(300);
A great guide to the new api can be found here.
In Java 8 you can do this:
Instant inst = Instant.parse("2018-12-30T19:34:50.63Z");
// subtract 10 Days to Instant
Instant value = inst.minus(Period.ofDays(10));
// print result
System.out.println("Instant after subtracting Days: " + value);
I have created a function to make the task easier.
For 7 days after dateString: dateCalculate(dateString,"yyyy-MM-dd",7);
To get 7 days upto dateString: dateCalculate(dateString,"yyyy-MM-dd",-7);
public static String dateCalculate(String dateString, String dateFormat, int days) {
Calendar cal = Calendar.getInstance();
SimpleDateFormat s = new SimpleDateFormat(dateFormat);
try {
cal.setTime(s.parse(dateString));
} catch (ParseException e) {
e.printStackTrace();
}
cal.add(Calendar.DATE, days);
return s.format(cal.getTime());
}
You may also be able to use the Duration class. E.g.
Date currentDate = new Date();
Date oneDayFromCurrentDate = new Date(currentDate.getTime() - Duration.ofDays(1).toMillis());
You can easily subtract with calendar with SimpleDateFormat
public static String subtractDate(String time,int subtractDay) throws ParseException {
Calendar cal = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm", Locale.ENGLISH);
cal.setTime(sdf.parse(time));
cal.add(Calendar.DATE,-subtractDay);
String wantedDate = sdf.format(cal.getTime());
Log.d("tag",wantedDate);
return wantedDate;
}