We Keep Coding

Convert the format of a date in Java/Typescript for searchpurposes

I search for a while now, but I didn't found what I need to solve my problem.
First of,I have a "add reminder page" in my app to add reminder with some inputs and the date / time:
<ion-row>
<ion-col>
<ion-label class="ion-label-links" >{{"Datum"|translate}}</ion-label>
</ion-col>
<ion-col text-right>
<ion-label class="ion-label-reminder-rechts">{{"Uhrzeit"|translate}}</ion-label>
</ion-col>
</ion-row>
<ion-row class="schnurr">
<ion-col>
<ion-datetime class="ion-input-reminder" displayFormat="DD.MM.YYYY" [(ngModel)]="reminder.myDate" ></ion-datetime>
</ion-col>
<ion-col>
<ion-datetime text-right class="ion-input-reminder-r" displayFormat="HH:mm" minuteValues="0,5,10,15,20,25,30,35,40,45,50,55" [(ngModel)]="reminder.myTime" ></ion-datetime>
</ion-col>
</ion-row>
And I set a standard date/time with this function:
formatLocalDate() {
var now = new Date(),
tzo = -now.getTimezoneOffset(),
dif = tzo >= 0 ? '+' : '-',
pad = function(num) {
var norm = Math.abs(Math.floor(num));
return (norm < 10 ? '0' : '') + norm;
};
return now.getFullYear()
+ '-' + pad(now.getMonth()+1)
+ '-' + pad(now.getDate())
+ 'T' + pad(now.getHours())
+ ':' + pad(now.getMinutes())
+ ':' + pad(now.getSeconds())
+ dif + pad(tzo / 60)
+ ':' + pad(tzo % 60);
}
Okay, everything is fine. I Save the record in my couchDb and it looks like this:
2017-07-05T09:18:24+02:00
Now the problem with this kind of format is that I implemented a search field but the usual format here is "dd.mm.yyyy" and not the ISO format, so I formated the output in my app like this:
<br><font size="1">{{item.doc.myDate | date:'dd.MM.yyyy, HH:mm'}} Uhr</font>
but if I search for that item, it doesn't work, because the variable is still in the old format.
My search is looking like this:
.....
<ion-item *ngIf="!searchvariable || item.doc.xName.toLowerCase().includes(this.searchvariable)
|| item.doc.myDate.toDateString().includes(this.searchvariable)" class="ion-item1" tappable (click)="openReminder(reminder.doc)" style="background-color: oldlace">
{{item.doc.myDate.toDateString()}}
......
The search is working for everything but the date. (because of the formatproblems)
Is there a possibility to do something like "reminder.myDate.format(xxx)" or something like this?
I mean, it's possible to alter the output, is there a similar way for my search?!
Btw. I have to format the date with this function, otherwise I get errors because the datepicker needs this format.
Thank you!

Conversion from "datetime-local" to java.sql.Timestamp

I have a form with input of type "datetime-local" on a jsp page, the data is passed to a servlet:
String resetTimeString = request.getParameter(RequestParameterName.RESET_TIME);
How to convert the input to java.sql.Timestamp?

EDIT:
Well, I found something new!
You can use Timestamp.valueOf() to format a time-string with the value of yyyy-[m]m-[d]d hh:mm:ss[.f...]
So it can also handle micro/nano seconds. The only thing you need to do is replace the T with a space.
This works:
String datetimeLocal = "1985-04-12T23:20:50.52";
System.out.println(Timestamp.valueOf(datetimeLocal.replace("T"," ")));
The output:
1985-04-12 23:20:50.52
According to this site your resetTimeString looks like this: '1985-04-12T23:20:50.52' (a string)
I couldn't find a method to convert this to a timestamp directly, but you could just split it up manually:
String[] dateTime = datetimeLocal.split("T");
String[] date = dateTime[0].split("-");
String[] time = dateTime[1].split(":");
This will print:
System.out.println("DateTime: " + Arrays.toString(dateTime));
System.out.println("Date: " + Arrays.toString(date));
System.out.println("Time: " + Arrays.toString(time));
>>> DateTime: [1985-04-12, 23:20:50]
>>> Date: [1985, 04, 12]
>>> Time: [23, 20, 50]
After that you could just create a new Timestamp: (This is deprecated!)
Timestamp stamp = new Timestamp(Integer.valueOf(date[0]).intValue() - 1900,
Integer.valueOf(date[1]).intValue(),
Integer.valueOf(date[2]).intValue(),
Integer.valueOf(time[0]).intValue(),
Integer.valueOf(time[1]).intValue(),
Integer.valueOf(time[2].split("\\.")[0]).intValue(),
Integer.valueOf(time[2].split("\\.")[1]).intValue());
Note that, if you use this you need to subtract '1900' from the year and split dots with \\.
Also, you'd need to handle nanoseconds (In my example I'm using the value 50.52 as seconds, but the string returned from your server might not contain the nanoseconds)
You could also calculate a long from the date and use new Timestamp(<long>)
I hope this helps :)

Cyphrags' answer won't work if seconds are set to "00", because Chrome won't send the seconds part resulting in a java.lang.IllegalArgumentException: Timestamp format must be yyyy-mm-dd hh:mm:ss[.fffffffff] when calling Timestamp.valueOf().
Therefore a more complete answer could be:
String datetimeLocal = "1985-04-12T23:20";
// make sure the seconds are set before parsing
if (StringUtils.countMatches(datetimelocal, ":") == 1) {
datetimelocal += ":00";
}
Timestamp value = Timestamp.valueOf(datetimeLocal.replace("T", " "));

understanding roll method in calendar class

If today's date is 19 July 2014
then my code works as follows :
Calendar c = Calendar.getInstance();
My code and output is:
c.roll(3, true);
System.out.print(c.get(Calendar.DATE) + " " + c.get(Calendar.MONTH) + " " + c.get(Calendar.YEAR));
o/p : 26 6 2014
c.roll(2, true);
System.out.print(c.get(Calendar.DATE) + " " + c.get(Calendar.MONTH) + " " + c.get(Calendar.YEAR)) o/p : 19 7 2014
c.roll(1, true);
System.out.print(c.get(Calendar.DATE) + " " + c.get(Calendar.MONTH) + " " + c.get(Calendar.YEAR)) o/p : 19 6 2015
roll now will add 1st parameter to my date and give the answer. Am i write? once it is adding to year once to the month... I am not getting the exact working of this method. Please feel free to correct me.

See javadoc of roll()-method. You should really use the predefined Calendar-constants for readability and avoiding errors. So your integer constants has following meaning:
c.roll(1, true); // is effectively the same as c.roll(YEAR, true);
c.roll(2, true); // is effectively the same as c.roll(MONTH, true);
c.roll(3, true); // is effectively the same as c.roll(WEEK_OF_YEAR, true);
Important: Be aware of the fact that rolling is different from adding a temporal amount. If you roll up the month December then you will just change to January in CURRENT year, not in next year! So I bet you are rather interested in the method add(int, int) using 1 as second argument.

Use the field constants within Calendar rather than passing integer constants. Then the method calls make a bit more sense:
c.roll(Calendar.MONTH, true);
http://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#YEAR
http://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#MONTH
http://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#DAY_OF_MONTH
http://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#HOUR_OF_DAY

Java7 GregorianCalendar timeInMillis from collection are not working well

I need to record a collection of objects that keep: Date, and average Day temperature.
and I need to be able to track back the date.
So I created a class that keeps these values and I made an ArrayList that keeps these objects.
In my code I test to keep 5 days. When I run the program and the ArrayList gets filled everything seems fine and the terminal displays:
dateSaved:2013-10-16 11:59:59 TimeStamp: 1381960799018
dateSaved:2013-10-17 11:59:59 TimeStamp: 1382047199018
dateSaved:2013-10-18 11:59:59 TimeStamp: 1382133599018
dateSaved:2013-10-19 11:59:59 TimeStamp: 1382219999018
These TimeStamps are all unique and seem to be fine.
however when I then enter the for loop and want to get the timestamps from each of these entries I get:
entry: 0 //removed since the first dateSaved has not been pasted*
entry: 1 timeInMillis: 1382306399018
entry: 2 timeInMillis: 1382306399018
entry: 3 timeInMillis: 1382306399018
entry: 4 timeInMillis: 1382306399018
These are all the same times and are: Sun, 20 Oct 2013 21:59:59 GMT
That is the date here. but not the time. And i'm not realy getting the values I expect to get.
What is going wrong here?
GregorianCalendar date = new GregorianCalendar();
GregorianCalendar beginDate = new GregorianCalendar();
beginDate.roll(beginDate.DAY_OF_YEAR ,-5);
while(beginDate.getTimeInMillis() < date.getTimeInMillis() )
{
GCalAndDouble dateAndTemp = new GCalAndDouble(beginDate, WeatherStation.Instance().getValue(Enums.MeasurementType.outsideTemperature, Enums.ValueType.average, beginDate) );
list.add(dateAndTemp);
System.out.println("dateSaved:" + new SimpleDateFormat("YYYY-MM-dd KK:mm:ss").format(new Timestamp(beginDate.getTimeInMillis())) + " TimeStamp: " + beginDate.getTimeInMillis() );
long timeTemp = beginDate.getTimeInMillis();
beginDate.setTimeInMillis(timeTemp + 86400000); // + the ammount of milliseconds in a day.
}
for(int j = 0; j < 5; j++)
{
GCalAndDouble tempdateandtemp = list.get(j);
long timestamptemp = tempdateandtemp.getDate().getTimeInMillis();
System.out.println("entry: " + j + " timeInMillis: " + timestamptemp);
}
Thanks for your help!

You are using the same beginDate object. This means that all the values will be the same. They might have changed as you were building the list, but the final value is all you will see.
Most likely you intended to create a new Date() object for each entry to give each one a different Date. BTW I prefer to use long which is not only more efficient but doesn't have this issue.

Java How to get the time when timer is stopped?

I'm currently referring to this link to create the timer for my program.
But I don't know how to get the time when timer is stopped.
I think System.getcurrentTimeMillis() cannot be used at this moment.
So, how can I get the current time when timer is stopped with the method mentioned?
EDIT :
I'm currently building a simple 4X4 memory game, and I have timer in my program, using the method from this link.
At the end of the game, I'll use a showMessageDialog to display the number of clicks and time used. However, I'm just able to display the clicks, which is the easiest part.
Based on the method from the link, I think I can use an easy way such as
JOptionPane.showMessageDialog( null, "Congratulations. \n You have win the game with " + click + " click(s) in " + hour + "hour(s) " + minute + " minute(s) " + second + " second(s).", "Win", 1);
Is there any better way of doing it?

You can use
Date d = new Date();
DateFormat df = new SimpleDateFormat("hh:mm:ss");
String dateStr = df.format(d);