Subtract month returning 3 digit day ( for example: 347/12/2019) in dart

Question

if i'm tried to get last month date using mentioned code i'm getting date like 347/12/2019 instead of 13/12/2019

  DateTime _startDate = DateTime.now();
  DateTime _endDate = DateTime.now().add(Duration(days: 7));
  DateTime Date=DateTime.now();

  Future datePicker(BuildContext context) async {

    final List<DateTime> picked = await DateRagePicker.showDatePicker(
        context: context,
        initialFirstDate: _startDate,
        initialLastDate: _endDate,
        firstDate: new DateTime(DateTime.now().year - 50),
        lastDate: new DateTime(DateTime.now().year + 50),
    );
    if (picked != null && picked.length == 2) {
      setState(() {
        _startDate = picked[0];
        _endDate = picked[1];
      });
    }

  }

onTap: (){
 setState(() {
    _startDate=new DateTime(Date.year, Date.month - 1, Date.day);
    _endDate=DateTime.now();
    Navigator.pop(context);
});
}

SRC URL

Does this answer your question? [Get Last Month Date In Flutter / Dart](https://stackoverflow.com/questions/51420559/get-last-month-date-in-flutter-dart) — Adam Strauss, Jan 13 '20 at 05:33
@AdamStrauss yes tried that method, for this method also i'm getting same output — Gokul Sundar, Jan 13 '20 at 05:38
@sudo_kaizen i'm working on DateRangePicker, in this screen i'm placed option to select last 30 days data, for that i'm retrieving startingDate using mentioned code. — Gokul Sundar, Jan 13 '20 at 05:42
For me `DateTime date=DateTime.now(); DateTime _startDate=new DateTime(date.year, date.month - 1, date.day);` is working fine. Please give your full code here so problem can be understood — Dev, Jan 13 '20 at 05:48
@GokulSundaramoorthy so exactly you need to get date one month before current date . correct? — Swaminathan V, Jan 13 '20 at 05:57
Kindly explain the exact need. Its really confusing with code as first you are adding 7 days then some ways subtracting a month. What you really want in startdate and enddate and is user picking range value between those days. — Dev, Jan 13 '20 at 06:02
@GokulSundaramoorthy Why don't you just setState(() {_startDate = DateTime(picked[0].year, (picked[0].month - 1), picked[0].day)}) Also, where is the implementation code of putting the value to widget? — Federick Jonathan, Jan 13 '20 at 06:40
@FederickJonathan i attached my full code here https://github.com/gokulsundar188/dart.git — Gokul Sundar, Jan 13 '20 at 06:49

score 0 · Answer 1 · edited Jan 14 '20 at 02:07

0

This works fine if what you are trying to do is to get the month before today's month

  DateTime now = DateTime.now();
  DateTime pastMonthFromNow = DateTime(now.year, now.month-1, now.day);
  print(pastMonthFromNow);

edited Jan 14 '20 at 02:07

orimdominic

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answered Jan 13 '20 at 05:34

Federick Jonathan

2,726
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Swaminathan V · Answer 2 · 2020-01-13T06:12:58.577

0

You have done everything correct, but a small tweak is required in setState(). Replace your setState as below.

setState(() {
     _startDate=new DateTime(_startDate.year, _startDate.month - 1, _startDate.day);
    _endDate=DateTime.now();
    Navigator.pop(context);
});

Check the gist here https://gist.github.com/ragu-swaminathan/4c2dd2f49f585397e67143d34707f7cb

edited Jan 13 '20 at 06:12

answered Jan 13 '20 at 06:02

Swaminathan V

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Are you getting the same 3 digit date? Above snippet will work fine. Please check the gist here : https://gist.github.com/ragu-swaminathan/4c2dd2f49f585397e67143d34707f7cb – Swaminathan V Jan 13 '20 at 06:12
yes still i'm getting the 3 digit date, in console it returning proper date, if i display that value in a Any Widget i'm getting 3 digit date – Gokul Sundar Jan 13 '20 at 06:21
1

@GokulSundaramoorthy Maybe it's because you don't follow dart convention about naming variable, you used upperCamelCase instead of lowerCamelCase. Just saying – Federick Jonathan Jan 13 '20 at 06:23
@FederickJonathan I think that may not be a problem? – Swaminathan V Jan 13 '20 at 06:26
@GokulSundaramoorthy share the plugin that you have used – Swaminathan V Jan 13 '20 at 06:29
@GokulSundaramoorthy I have edited my answer, just try it and compare it with your code. – Federick Jonathan Jan 13 '20 at 06:34
@RaguSwaminathan Yea, just saying. I also think it's not the problem but you are supposed to get a warning asking you to change it to lowerCamelCase. – Federick Jonathan Jan 13 '20 at 06:34
@RaguSwaminathan plugin means? – Gokul Sundar Jan 13 '20 at 06:37
Date range picker library that you have used. Since there is no problem found in the logic , we need to check the output returned from the that library is valid. Sometimes date format may be different – Swaminathan V Jan 13 '20 at 06:40
@RaguSwaminathan i have attached src URL – Gokul Sundar Jan 13 '20 at 06:53

Subtract month returning 3 digit day ( for example: 347/12/2019) in dart

2 Answers2