how are you ?
my backend just accept date and time in this format 2019-03-24 11:00:00
and i use in my app calendar widget to get the date and it print the date in this format 2019-04-24 12:00:00.000Z and i use this code to get the time
TimeOfDay _time = new TimeOfDay.now();
Future<Null> _selecTime(BuildContext context) async {
final TimeOfDay picked = await showTimePicker(
context: context,
initialTime: _time,
);
if (picked != null && picked != _time) {
print('${_time.toString()}');
setState(() {
_time = picked;
});
}
}
and i get this TimeOfDay(07:37)
so how can i get format for date like this 2019-04-24 and for time like this 11:00:00 and i will deal with it
thanks
You can use intl package
Here is an example:
import 'package:intl/intl.dart';
main() {
var now = new DateTime.now();
var dateFormat = new DateFormat('yyyy-MM-dd HH:mm:ss');
String formattedDate = dateFormat.format(now);
print(formattedDate); // 2019-04-28 09:02:29
}
You can do this task without any third-party package only by extensions.
void main() {
DateTime now = DateTime.now();
print(now.getTime24());
}
extension ExtractTime on DateTime {
String getTime24() => "$year-${month.addZero()}-${day.addZero()} ${hour.addZero()}:${minute.addZero()}:${second.addZero()}";
}
extension AddZero on int {
String addZero() => "${"$this".length==1?'0$this':this}";
}
Related
I have a requirement of converting Stream<List<T>> to Stream<Map<K,T>>
I have a class
class Order
{
int id;
DateTime date;
}
I want to convert Stream<List<Order>> to Stream<Map<DateTime, List<Order>>
I want to display orders as below
12-Dec-2020
Order 1
Order 2
13-Dec-2020
Order 3
Order 4
14-Dec-2020
Order 5
Order 6
Suggestions for a better DS are welcome.
How do I do this?
Please suggest.
Thanks in advance.
Using groupListsBy from collection: ^1.15.0
K keySelector(T t) { ... }
final Stream<List<T>> source$ = ...;
final Stream<Map<K, List<T>>> result$ = source$.map((list) => list.groupListsBy(keySelector));
You can do this without any package.
First, you have to create an empty Map, then map a List<Order> to a map with a key as a date from the list item (single order) then add it to That Empty map.
Check if the date is available as a key in Map. If the date exists as a key in that map then simply add a new order to that value or else simply add a new key to the Map.
Code:
Stream<List<Order>> orders = ...;
Stream<Map<DateTime, List<Order>>> ordersByDate = {};
orders.forEach((Order order){
ordersByDate.keys.contains(order.date)
? ordersByDate.update(order.date, (oldValue) => oldValue + <Order>[order])
: ordersByDate[order.date] = [order];
});
print(ordersByDate);
//At here your ordersByDate
Let me know if it works for you.
Fold method is what you're looking for.
Example:
void main() async {
final today = DateTime.now();
final tomorrow = today.add(const Duration(days: 1));
final order1 = Order(1, today);
final order2 = Order(2, today);
final order3 = Order(3, tomorrow);
final x = await Stream
.fromIterable([order1, order2, order3])
.fold<Map<DateTime, List<Order>>>({}, (val, element) {
(val[element.date] ??= []).add(element);
// Same as:
// if (val[element.date] == null) {
// val[element.date] = [];
// }
// val[element.date]!.add(element);
return val;
});
print(x);
}
class Order
{
int id;
DateTime date;
Order(this.id, this.date);
#override
String toString() {
return 'Order(id: $id, date: $date)';
}
}
I´m trying to create a datetime select in flutter. I have the frontend but I need to create function to show date time selector. I follow this video but i don´t know why return
Undefined Class 'Datetime'`
DateTime date = new DateTime.now();
Future<Null> selectDate(BuildContext context) async {
final Datetime picked = await showDatePicker(
context: context,
initialDate: date,
firstDate: new DateTime(2010),
lastDate: null);
if (picked != null && picked != date) {
print('date selected: ${date.toString()}');
setState(() {
date = picked;
});
}
}
So anybody has idea what is wrong?
You have a typo declaring your picked variable - should be DateTime with a capital T.
I have a textfield with a binding to a timestring like this:
timeStringProperty.bind(clock.getTimeString());
timeTextField.textProperty().bind(timeStringProperty);
In Clock.java I have:
public StringBinding getTimeString() {
return Bindings.createStringBinding(() -> DateTimeFormatter.ofLocalizedTime(FormatStyle.MEDIUM).format(time.get()), time);
}
where time comes from a TimeLine.
This works well and the current time is displayed and updated in the timeTextfield.
Now I want to add the ability for the user of my program to determine the format of the time e.g. "hh:mm" or "hh:mm:ss".
How can I bind to a formatString, such that the time display updates with the new format as soon as the formatString value is changed?
Introduce an ObjectProperty<DateTimeFormatter> to Clock:
public class Clock {
private final ObjectProperty<DateTimeFormatter> formatter =
new SimpleObjectProperty<>(DateTimeFormatter.ofLocalizedTime(FormatStyle.MEDIUM));
public ObjectProperty<DateTimeFormatter> formatterProperty() {
return formatter ;
}
public final DateTimeFormatter getFormatter() {
return formatterProperty().get();
}
public final void setFormatter(DateTimeFormatter formatter) {
formatterProperty().set(formatter);
}
// ... other code as before
}
And now update the StringBinding so that it uses the formatter and binds to it:
public StringBinding getTimeString() {
return Bindings.createStringBinding(() -> getFormatter().format(time.get()), time, formatter);
}
I have "2011-12-05" and I want to convert this to "Monday 05-Dec-2011".
My date conversion code depends on the device timezone. If my timezone is India, then I get date Monday 05-Dec-2011 and if my timezone is Kingston, Jamaica, I get Sunday 04-Dec-2011.
For this reason my application does not display the correct date for different timezones.
Is there any solution to convert date without Blackberry Date class or using current Date and Time Zone?
I want to only convert this date to String
I am converting this date using below function
public static String reformatMonthDate(String source)
{
SimpleDateFormat write = new SimpleDateFormat("dd MMM yyyy"); //YYYY-MMM-dd
Date date = new Date(HttpDateParser.parse(source));
return write.format(date);
}
You can specify a specific locale, instead of relying on the system's default.
Locale locale = Locale.get(Locale.LOCALE_fr);
// Parse with HttpDateParser
Date date = new Date(HttpDateParser.parse("2002-01-29"));
// Format with a custom format and locale
DateFormat formatter = new SimpleDateFormat("E, dd MMM yyyy", locale);
StringBuffer buf = new StringBuffer(30);
String s = formatter.format(date, buf, null).toString(); // mar., 29 janv. 2002
DateTimePicker gives the current date according to the location or device configuration settings.
Try this code:
You should get your requirement.
public class LoadingScreen extends MainScreen implements FieldChangeListener
{
private String select_Date[]={"Select Date"};
private String month_ar[]={"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
private ObjectChoiceField choiceField;
private ButtonField show;
public LoadingScreen()
{
createGUI();
}
private void createGUI()
{
choiceField=new ObjectChoiceField("Select Date: ", select_Date, 0)
{
protected boolean navigationClick(int status, int time)
{
DateTimePicker datePicker = DateTimePicker.createInstance( Calendar.getInstance(), "dd/MM/yyyy",null);
datePicker.doModal();
Calendar cal1=datePicker.getDateTime();
String day="";
String mon="";
if(String.valueOf(cal1.get(Calendar.DAY_OF_MONTH)).length()==1)
{
day="0"+String.valueOf(cal1.get(Calendar.DAY_OF_MONTH));
}
else
{
day=String.valueOf(cal1.get(Calendar.DAY_OF_MONTH));
}
mon=String.valueOf(cal1.get(Calendar.MONTH));
String month=""+month_ar[cal1.get(Calendar.MONTH)];
select_Date[0]=day+"-"+month+"-"+cal1.get(Calendar.YEAR);
choiceField.setChoices(select_Date);
return true;
}
};
add(choiceField);
show=new ButtonField("Show",FIELD_HCENTER);
show.setChangeListener(this);
add(show);
}
public void fieldChanged(Field field, int context)
{
if(field==show)
{
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
Dialog.alert(select_Date[choiceField.getSelectedIndex()]);
}
});
}
}
public boolean onMenu(int instance)
{
return true;
}
protected boolean onSavePrompt()
{
return true;
}
}
Default calendar widget of Smartgwt Component shows date as Sun 10/31 ( MM/DD format ) .
http://www.smartclient.com/smartgwt/showcase/#simple_calendar_category
How can I change the date format to DD/MM formatin Calendar Widget ?
Thanks in advance for having a look,
Sachin
SmartGwt provides a static DateUtil for changing date formats.Put the following code somewhere in your application and it will change the date format through out the application
DateUtil.setShortDateDisplayFormatter(new DateDisplayFormatter() {
public String format(Date date) {
if(date == null) return null;
final DateTimeFormat dateFormatter = DateTimeFormat.getFormat("DD/MM/yyyy");
String format = dateFormatter.format(date);
return format;
}
});
Take a look to the com.smartgwt.client.util.DateUtil specifically to the methods setShortDateDisplayFormat and setShortDateDisplayFormatter
This should solve your problem, according to the documentation.
put
this.setDateFormatter(DateDisplayFormat.TOEUROPEANSHORTDATE);
in constructor
#aruns is correct, however another step is need if you are using RelativeDateItem
DateUtil.setShortDatetimeDisplayFormatter(new DateDisplayFormatter()
{
public String format(Date date)
{
if(date == null)
{
return null;
}
else
{
final DateTimeFormat dateFormatter = DateTimeFormat.getFormat(DATE_FORMAT);
return dateFormatter.format(date);
}
}
});
DateUtil.setDateParser(new DateParser()
{
public Date parse(String dateString)
{
final DateTimeFormat format = DateTimeFormat.getFormat(DATE_FORMAT);
return format.parse(dateString);
}
});
The DateFormat is defined in the GWT documentation