125 lines
3.7 KiB
Dart
125 lines
3.7 KiB
Dart
import 'package:intl/intl.dart';
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DateTime getToday() {
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DateTime now = DateTime.now().toUtc();
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return DateTime.utc(now.year, now.month, now.day);
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}
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enum DatePrecision { decade, year, month, day, hour, minute }
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extension DatePrecisionComparison on DatePrecision {
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bool operator <(DatePrecision other) {
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return index < other.index;
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}
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bool operator <=(DatePrecision other) {
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return index <= other.index;
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}
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bool operator >(DatePrecision other) {
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return index > other.index;
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}
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bool operator >=(DatePrecision other) {
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return index >= other.index;
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}
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}
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DateTime simplifyDateToPrecision(DateTime date, DatePrecision precision) {
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switch (precision) {
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case DatePrecision.decade:
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return DateTime(date.year ~/ 10 * 10);
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case DatePrecision.year:
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return DateTime(date.year);
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case DatePrecision.month:
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return DateTime(date.year, date.month);
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case DatePrecision.day:
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return DateTime(date.year, date.month, date.day);
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case DatePrecision.hour:
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return DateTime(date.year, date.month, date.day, date.hour);
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case DatePrecision.minute:
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return DateTime(date.year, date.month, date.day, date.hour, date.minute);
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}
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}
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class DateWithPrecision implements Comparable<DateWithPrecision> {
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DateTime date;
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DatePrecision precision;
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DateWithPrecision(DateTime date, this.precision)
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: date = simplifyDateToPrecision(date, precision);
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DateWithPrecision.fromJsonEncodable(List<dynamic> json)
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: date = DateTime.parse(json[0]),
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precision = DatePrecision.values
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.firstWhere((element) => element.name == json[1]);
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DateWithPrecision.today() : this(DateTime.now().toUtc(), DatePrecision.day);
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List<dynamic> toJsonEncodable() {
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return [date.toIso8601String(), precision.name];
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}
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@override
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String toString() {
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return switch (precision) {
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DatePrecision.decade =>
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"${DateFormat("yyyy").format(date).substring(0, 3)}0s",
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DatePrecision.year => DateFormat.y().format(date),
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DatePrecision.month => DateFormat.yMMMM().format(date),
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DatePrecision.day => DateFormat.yMMMMd().format(date),
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DatePrecision.hour => DateFormat("MMMM d, yyyy, HH").format(date),
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DatePrecision.minute => DateFormat("MMMM d, yyyy, HH:mm").format(date)
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};
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}
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@override
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int compareTo(DateWithPrecision other) {
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if (date.isBefore(other.date)) {
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return -1;
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} else if (date.isAfter(other.date)) {
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return 1;
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} else {
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return precision.index - other.precision.index;
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}
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}
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@override
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bool operator ==(Object other) {
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return other is DateWithPrecision &&
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date == other.date &&
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precision == other.precision;
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}
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@override
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int get hashCode {
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return date.hashCode ^ precision.hashCode;
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}
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bool includes(DateTime date) {
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switch (precision) {
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case DatePrecision.decade:
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return this.date.year ~/ 10 == date.year ~/ 10;
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case DatePrecision.year:
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return this.date.year == date.year;
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case DatePrecision.month:
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return this.date.year == date.year && this.date.month == date.month;
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case DatePrecision.day:
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return this.date.year == date.year &&
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this.date.month == date.month &&
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this.date.day == date.day;
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case DatePrecision.hour:
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return this.date.year == date.year &&
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this.date.month == date.month &&
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this.date.day == date.day &&
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this.date.hour == date.hour;
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case DatePrecision.minute:
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return this.date.year == date.year &&
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this.date.month == date.month &&
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this.date.day == date.day &&
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this.date.hour == date.hour &&
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this.date.minute == date.minute;
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}
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}
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}
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