doctor_app_flutter/lib/util/date-utils.dart

import 'package:doctor_app_flutter/util/translations_delegate_base.dart';
import 'package:flutter/cupertino.dart';
import 'package:intl/intl.dart';

class DateUtils {

  static String convertDateToFormat(DateTime dateTime, String dateFormat) {
    return DateFormat(dateFormat).format(dateTime);
  }

  static String convertStringToDateFormat(String date, String dateFormat) {
    DateTime dateTime = DateTime.parse(date);
    return convertDateToFormat(dateTime, dateFormat);
  }

  static convertDateFromServerFormat(String str, dateFormat) {
    var date = getDateTimeFromServerFormat(str);

    return DateFormat(dateFormat).format(date);
  }

  static DateTime getDateTimeFromServerFormat(String str) {
    const start = "/Date(";

    const end = "+0300)";

    final startIndex = str.indexOf(start);

    final endIndex = str.indexOf(end, startIndex + start.length);

    var date = new DateTime.fromMillisecondsSinceEpoch(
        int.parse(str.substring(startIndex + start.length, endIndex)));

    return date;
  }

  static String differenceBetweenDateAndCurrentInYearMonthDay(DateTime firstDate, BuildContext context) {
    DateTime now = DateTime.now();
    // now = now.add(Duration(days: 400, minutes: 0));
    var difference = firstDate.difference(now);

    int years = now.year - firstDate.year;
    int months = now.month - firstDate.month;
    int days = now.day - firstDate.day;

    if (months < 0 || (months == 0 && days < 0)) {
      years--;
      months += (days < 0 ? 11 : 12);
    }
    if (days < 0) {
      final monthAgo = new DateTime(now.year, now.month - 1, firstDate.day);
      days = now.difference(monthAgo).inDays + 1;
    }
    return "$days ${TranslationBase.of(context).days}, $months ${TranslationBase.of(context).months}, $years ${TranslationBase.of(context).years}";
  }

  static String differenceBetweenDateAndCurrent(DateTime firstDate, BuildContext context) {
    DateTime now = DateTime.now();
    // DateTime now = nows.add(Duration(days: 400, minutes: 25, hours: 0));
    var difference = now.difference(firstDate);

    int minutesInDays = difference.inMinutes;
    int hoursInDays = minutesInDays ~/ 60; // ~/ : truncating division to make the result int
    int minutes = minutesInDays % 60;
    int days = hoursInDays ~/ 24;
    int hours = hoursInDays % 24;

    double hoursInOneDay = difference.inHours / difference.inDays;

    return "$days ${TranslationBase.of(context).days}, $hours ${TranslationBase.of(context).hr}, $minutes ${TranslationBase.of(context).min}";
  }

  static String differenceBetweenServerDateAndCurrent(String str, BuildContext context) {
    const start = "/Date(";

    const end = "+0300)";

    final startIndex = str.indexOf(start);

    final endIndex = str.indexOf(end, startIndex + start.length);

    var date = new DateTime.fromMillisecondsSinceEpoch(
        int.parse(str.substring(startIndex + start.length, endIndex)));
    return differenceBetweenDateAndCurrent(date, context);
  }

  /// get month by
  /// [weekDay] convert week day in int to week day name
  static getWeekDay(int weekDay) {
    switch (weekDay) {
      case 1:
        return "Monday";
      case 2:
        return "Tuesday";
      case 3:
        return "Wednesday";
      case 4:
        return "Thursday";
      case 5:
        return "Friday";
      case 6:
        return "Saturday ";
      case 7:
        return "Sunday";
    }
  }

  /// get month by
  /// [weekDay] convert week day in int to week day name arabic
  static getWeekDayArabic(int weekDay) {
    switch (weekDay) {
      case 1:
        return "الاثنين";
      case 2:
        return "الثلاثاء";
      case 3:
        return "الاربعاء";
      case 4:
        return "الخميس";
      case 5:
        return "الجمعه";
      case 6:
        return "السبت ";
      case 7:
        return "الاحد";
    }
  }

  /// get month by
  /// [month] convert month number in to month name
  static getMonth(int month) {
    switch (month) {
      case 1:
        return "January";
      case 2:
        return "February";
      case 3:
        return "March";
      case 4:
        return "April";
      case 5:
        return "May";
      case 6:
        return "June";
      case 7:
        return "July";
      case 8:
        return "August";
      case 9:
        return "September";
      case 10:
        return "October";
      case 11:
        return "November";
      case 12:
        return "December";
    }
  }

  /// get month by
  /// [month] convert month number in to month name in Arabic
  static getMonthArabic(int month) {
    switch (month) {
      case 1:
        return "يناير";
      case 2:
        return " فبراير";
      case 3:
        return "مارس";
      case 4:
        return "أبريل";
      case 5:
        return "مايو";
      case 6:
        return "يونيو";
      case 7:
        return "يوليو";
      case 8:
        return "أغسطس";
      case 9:
        return "سبتمبر";
      case 10:
        return " اكتوبر";
      case 11:
        return " نوفمبر";
      case 12:
        return "ديسمبر";
    }
  }

  static getMonthByName(String month) {
    switch (month.toLowerCase()) {
      case 'january':
        return 1;
      case 'february':
        return 2;
      case 'march':
        return 3;
      case 'april':
        return 4;
      case 'may':
        return 5;
      case 'june':
        return 6;
      case 'july':
        return 7;
      case 'august':
        return 8;
      case 'september':
        return 9;
      case 'october':
        return 10;
      case 'november':
        return 11;
      case 'december':
        return 12;
    }
  }

  static String getAgeByBirthday(dynamic birthday, BuildContext context){
    // https://leechy.dev/calculate-dates-diff-in-dart
    DateTime birthDate  = DateUtils.getDateTimeFromServerFormat(birthday);
    final now = DateTime.now();
    int years = now.year - birthDate .year;
    int months = now.month - birthDate.month;
    int days = now.day - birthDate.day;
    if (months < 0 || (months == 0 && days < 0)) {
      years--;
      months += (days < 0 ? 11 : 12);
    }
    if (days < 0) {
      final monthAgo = new DateTime(now.year, now.month - 1, birthDate.day);
      days = now.difference(monthAgo).inDays + 1;
    }
    return "$years ${TranslationBase.of(context).years}  $months ${TranslationBase.of(context).months} $days ${TranslationBase.of(context).days}";
  }
}