90 lines
2.7 KiB
Dart
90 lines
2.7 KiB
Dart
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Forked from https://github.com/dart-lang/sdk/blob/master/samples-dev/swarm/swarm_ui_lib/util/DateUtils.dart
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class DateUtils {
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static const WEEKDAYS = const ['Monday', 'Tuesday', 'Wednesday', 'Thursday',
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'Friday', 'Saturday', 'Sunday'];
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static const YESTERDAY = 'Yesterday';
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static const MS_IN_WEEK =
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DateTime.DAYS_PER_WEEK * Duration.MILLISECONDS_PER_DAY;
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// TODO(jmesserly): locale specific date format
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static String _twoDigits(int n) {
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if (n >= 10) return "${n}";
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return "0${n}";
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}
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/** Formats a time in H:MM A format */
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static String toHourMinutesString(Duration duration) {
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assert(duration.inDays == 0);
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int hours = duration.inHours;
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String a;
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if (hours >= 12) {
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a = 'pm';
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if (hours != 12) {
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hours -= 12;
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}
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} else {
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a = 'am';
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if (hours == 0) {
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hours += 12;
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}
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}
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String twoDigits(int n) {
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if (n >= 10) return "${n}";
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return "0${n}";
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}
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String mm =
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twoDigits(duration.inMinutes.remainder(Duration.MINUTES_PER_HOUR));
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return "${hours}:${mm} ${a}";
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}
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/**
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* A date/time formatter that takes into account the current date/time:
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* - if it's from today, just show the time
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* - if it's from yesterday, just show 'Yesterday'
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* - if it's from the same week, just show the weekday
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* - otherwise, show just the date
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*/
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static String toRecentTimeString(DateTime then) {
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bool datesAreEqual(DateTime d1, DateTime d2) {
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return (d1.year == d2.year) && (d1.month == d2.month) &&
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(d1.day == d2.day);
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}
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final now = new DateTime.now();
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if (datesAreEqual(then, now)) {
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return toHourMinutesString(new Duration(
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days: 0,
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hours: then.hour,
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minutes: then.minute,
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seconds: then.second,
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milliseconds: then.millisecond));
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}
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final today = new DateTime(now.year, now.month, now.day, 0, 0, 0, 0);
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Duration delta = today.difference(then);
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if (delta.inMilliseconds < Duration.MILLISECONDS_PER_DAY) {
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return YESTERDAY;
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} else if (delta.inMilliseconds < MS_IN_WEEK) {
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return WEEKDAYS[then.weekday];
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} else {
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String twoDigitMonth = _twoDigits(then.month);
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String twoDigitDay = _twoDigits(then.day);
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return "${then.year}-${twoDigitMonth}-${twoDigitDay}";
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}
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}
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static String toDateString(DateTime then) {
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// TODO(jmesserly): locale specific date format
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String twoDigitMonth = _twoDigits(then.month);
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String twoDigitDay = _twoDigits(then.day);
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return "${then.year}-${twoDigitMonth}-${twoDigitDay}";
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}
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}
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