add widget date time picker

lib/presentation/custom_widgets/widget_field_time_picker.dart

+import 'package:farm_tpf/utils/const_style.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';
+import 'package:farm_tpf/utils/formatter.dart';
+import 'package:get/get.dart';
+import 'package:get/state_manager.dart';
+
+class WidgetFieldDateTimePicker extends StatefulWidget {
+  final DateTime initDateTime;
+  final Function(DateTime selectedDateTimeLocal) onUpdateDateTime;
+  WidgetFieldDateTimePicker(
+      {@required this.initDateTime, @required this.onUpdateDateTime});
+  @override
+  _WidgetFieldDateTimePickerState createState() =>
+      _WidgetFieldDateTimePickerState();
+}
+
+class _WidgetFieldDateTimePickerState extends State<WidgetFieldDateTimePicker> {
+  var changeDate = Get.put(ChangeDateTimePicker());
+  @override
+  void initState() {
+    super.initState();
+    changeDate.initValue(selectedDate: widget.initDateTime);
+    widget.onUpdateDateTime(changeDate.selectedDateTime);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return GetBuilder<ChangeDateTimePicker>(builder: (value) {
+      return FlatButton(
+          padding:
+              EdgeInsets.only(top: 0.0, right: 0.0, bottom: 0.0, left: 0.0),
+          onPressed: () {
+            DatePicker.showDateTimePicker(context,
+                showTitleActions: true,
+                onChanged: (date) {}, onConfirm: (date) {
+              changeDate.change(date);
+              widget.onUpdateDateTime(date);
+            }, currentTime: value.selectedDateTime, locale: LocaleType.vi);
+          },
+          child: Container(
+              padding: EdgeInsets.only(
+                  top: 0.0, right: 0.0, bottom: 10.5, left: 0.0),
+              decoration: BoxDecoration(
+                border: kBorderTextField,
+              ),
+              child: Row(
+                children: [
+                  Expanded(
+                      child: Text(
+                    value.selectedDateTime.displayDateTime_DDMMYYYY_HHmm(),
+                    style: TextStyle(fontSize: 14.0, color: Colors.black87),
+                  )),
+                  Icon(
+                    Icons.date_range,
+                    color: Colors.blue,
+                  ),
+                ],
+              )));
+    });
+  }
+}
+
+class ChangeDateTimePicker extends GetxController {
+  DateTime selectedDateTime;
+  initValue({DateTime selectedDate}) {
+    selectedDateTime = selectedDate ?? DateTime.now();
+    update();
+  }
+
+  change(DateTime dateTime) {
+    selectedDateTime = dateTime;
+    update();
+  }
+}

lib/utils/formatter.dart

 
 import 'package:intl/intl.dart';
 
+extension formatDateTime on DateTime {
+  String convertLocalDateTimeToStringUtcDateTime() {
+    try {
+      String utcDateString =
+          DateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'").format(this.toUtc());
+      return utcDateString;
+    } catch (_) {
+      return "";
+    }
+  }
+
+  String displayDateTime_DDMMYYYY_HHmm() {
+    try {
+      return DateFormat("dd/MM/yyyy HH:mm").format(this);
+    } catch (_) {
+      return "";
+    }
+  }
+}
+
 extension ddMM_HHmm on String {
   //"2020-08-13T02:11:32Z" => 13/08 02:11
   // convert utc to local timezone
     }
   }
 
-//TODO: Check timezone with api update true/false
+  // Convert server timezone + 0 -> local timezone
   String format_DDMMYY_HHmm() {
     try {
       final str = this.toString();
       var dateFromString =
-          DateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'").parse(str, false).toLocal();
+          DateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'").parse(str, true).toLocal();
       return DateFormat("dd/MM/yyyy HH:mm").format(dateFromString);
     } catch (_) {
       return "";
     }
   }
 
+  DateTime convertStringServerDateTimeToLocalDateTime() {
+    return DateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'").parse(this, true).toLocal();
+  }
+
   String formatStringToStringDecimal() {
     try {
       var numOfString = double.tryParse(this.toString());