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comparison: js/xpconnect/loader/ISO8601DateUtils.jsm

js/xpconnect/loader/ISO8601DateUtils.jsm

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TOR_BUG_9701
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1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 const HOURS_TO_MINUTES = 60;
7 const MINUTES_TO_SECONDS = 60;
8 const SECONDS_TO_MILLISECONDS = 1000;
9 const MINUTES_TO_MILLISECONDS = MINUTES_TO_SECONDS * SECONDS_TO_MILLISECONDS;
10 const HOURS_TO_MILLISECONDS = HOURS_TO_MINUTES * MINUTES_TO_MILLISECONDS;
11
12 this.EXPORTED_SYMBOLS = ["ISO8601DateUtils"];
13
14 debug("*** loading ISO8601DateUtils\n");
15
16 this.ISO8601DateUtils = {
17
18 /**
19 * XXX Thunderbird's W3C-DTF function
20 *
21 * Converts a W3C-DTF (subset of ISO 8601) date string to a Javascript
22 * date object. W3C-DTF is described in this note:
23 * http://www.w3.org/TR/NOTE-datetime IETF is obtained via the Date
24 * object's toUTCString() method. The object's toString() method is
25 * insufficient because it spells out timezones on Win32
26 * (f.e. "Pacific Standard Time" instead of "PST"), which Mail doesn't
27 * grok. For info, see
28 * http://lxr.mozilla.org/mozilla/source/js/src/jsdate.c#1526.
29 */
30 parse: function ISO8601_parse(aDateString) {
31 var dateString = aDateString;
32 if (!dateString.match('-')) {
33 // Workaround for server sending
34 // dates such as: 20030530T11:18:50-08:00
35 // instead of: 2003-05-30T11:18:50-08:00
36 var year = dateString.slice(0, 4);
37 var month = dateString.slice(4, 6);
38 var rest = dateString.slice(6, dateString.length);
39 dateString = year + "-" + month + "-" + rest;
40 }
41
42 var parts = dateString.match(/(\d{4})(-(\d{2,3}))?(-(\d{2}))?(T(\d{2}):(\d{2})(:(\d{2})(\.(\d+))?)?(Z|([+-])(\d{2}):(\d{2}))?)?/);
43
44 // Here's an example of a W3C-DTF date string and what .match returns for it.
45 //
46 // date: 2003-05-30T11:18:50.345-08:00
47 // date.match returns array values:
48 //
49 // 0: 2003-05-30T11:18:50-08:00,
50 // 1: 2003,
51 // 2: -05,
52 // 3: 05,
53 // 4: -30,
54 // 5: 30,
55 // 6: T11:18:50-08:00,
56 // 7: 11,
57 // 8: 18,
58 // 9: :50,
59 // 10: 50,
60 // 11: .345,
61 // 12: 345,
62 // 13: -08:00,
63 // 14: -,
64 // 15: 08,
65 // 16: 00
66
67 // Create a Date object from the date parts. Note that the Date
68 // object apparently can't deal with empty string parameters in lieu
69 // of numbers, so optional values (like hours, minutes, seconds, and
70 // milliseconds) must be forced to be numbers.
71 var date = new Date(parts[1], parts[3] - 1, parts[5], parts[7] || 0,
72 parts[8] || 0, parts[10] || 0, parts[12] || 0);
73
74 // We now have a value that the Date object thinks is in the local
75 // timezone but which actually represents the date/time in the
76 // remote timezone (f.e. the value was "10:00 EST", and we have
77 // converted it to "10:00 PST" instead of "07:00 PST"). We need to
78 // correct that. To do so, we're going to add the offset between
79 // the remote timezone and UTC (to convert the value to UTC), then
80 // add the offset between UTC and the local timezone //(to convert
81 // the value to the local timezone).
82
83 // Ironically, W3C-DTF gives us the offset between UTC and the
84 // remote timezone rather than the other way around, while the
85 // getTimezoneOffset() method of a Date object gives us the offset
86 // between the local timezone and UTC rather than the other way
87 // around. Both of these are the additive inverse (i.e. -x for x)
88 // of what we want, so we have to invert them to use them by
89 // multipying by -1 (f.e. if "the offset between UTC and the remote
90 // timezone" is -5 hours, then "the offset between the remote
91 // timezone and UTC" is -5*-1 = 5 hours).
92
93 // Note that if the timezone portion of the date/time string is
94 // absent (which violates W3C-DTF, although ISO 8601 allows it), we
95 // assume the value to be in UTC.
96
97 // The offset between the remote timezone and UTC in milliseconds.
98 var remoteToUTCOffset = 0;
99 if (parts[13] && parts[13] != "Z") {
100 var direction = (parts[14] == "+" ? 1 : -1);
101 if (parts[15])
102 remoteToUTCOffset += direction * parts[15] * HOURS_TO_MILLISECONDS;
103 if (parts[16])
104 remoteToUTCOffset += direction * parts[16] * MINUTES_TO_MILLISECONDS;
105 }
106 remoteToUTCOffset = remoteToUTCOffset * -1; // invert it
107
108 // The offset between UTC and the local timezone in milliseconds.
109 var UTCToLocalOffset = date.getTimezoneOffset() * MINUTES_TO_MILLISECONDS;
110 UTCToLocalOffset = UTCToLocalOffset * -1; // invert it
111 date.setTime(date.getTime() + remoteToUTCOffset + UTCToLocalOffset);
112
113 return date;
114 },
115
116 create: function ISO8601_create(aDate) {
117 function zeropad (s, l) {
118 s = s.toString(); // force it to a string
119 while (s.length < l) {
120 s = '0' + s;
121 }
122 return s;
123 }
124
125 var myDate;
126 // if d is a number, turn it into a date
127 if (typeof aDate == 'number') {
128 myDate = new Date()
129 myDate.setTime(aDate);
130 } else {
131 myDate = aDate;
132 }
133
134 // YYYY-MM-DDThh:mm:ssZ
135 var result = zeropad(myDate.getUTCFullYear (), 4) +
136 zeropad(myDate.getUTCMonth () + 1, 2) +
137 zeropad(myDate.getUTCDate (), 2) + 'T' +
138 zeropad(myDate.getUTCHours (), 2) + ':' +
139 zeropad(myDate.getUTCMinutes (), 2) + ':' +
140 zeropad(myDate.getUTCSeconds (), 2) + 'Z';
141
142 return result;
143 }
144 }

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