summaryrefslogtreecommitdiff
path: root/indra/llcommon/lldate.h
blob: d6982fbd9e049bd1e0e42489429f658cf9284fa8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/** 
 * @file lldate.h
 * @author Phoenix
 * @date 2006-02-05
 * @brief Declaration of a simple date class.
 *
 * $LicenseInfo:firstyear=2006&license=viewergpl$
 * 
 * Copyright (c) 2006-2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at
 * http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

#ifndef LL_LLDATE_H
#define LL_LLDATE_H

#include <iosfwd>
#include <string>

#include "stdtypes.h"

/** 
 * @class LLDate
 * @brief This class represents a particular point in time in UTC.
 *
 * The date class represents a point in time after epoch - 1970-01-01.
 */
class LL_COMMON_API LLDate
{
public:
	/** 
	 * @brief Construct a date equal to epoch.
	 */
	LLDate();

	/** 
	 * @brief Construct a date equal to the source date.
	 */
	LLDate(const LLDate& date);

	/** 
	 * @brief Construct a date from a seconds since epoch value.
	 *
	 * @pararm seconds_since_epoch The number of seconds since UTC epoch.
	 */
	LLDate(F64 seconds_since_epoch);

	/** 
	 * @brief Construct a date from a string representation
	 *
	 * The date is constructed in the <code>fromString()</code>
	 * method. See that method for details of supported formats.
	 * If that method fails to parse the date, the date is set to epoch.
	 * @param iso8601_date An iso-8601 compatible representation of the date.
	 */
	LLDate(const std::string& iso8601_date);

	/** 
	 * @brief Return the date as in ISO-8601 string.
	 *
	 * @return A string representation of the date.
	 */
	std::string asString() const;
	std::string asRFC1123() const;
	void toStream(std::ostream&) const;
	std::string toHTTPDateString (std::string fmt) const;
	static std::string toHTTPDateString (tm * gmt, std::string fmt);
	static void toHTTPDateStream(std::ostream&, tm *, std::string);
	/** 
	 * @brief Set the date from an ISO-8601 string.
	 *
	 * The parser only supports strings conforming to
	 * YYYYF-MM-DDTHH:MM:SS.FFZ where Y is year, M is month, D is day,
	 * H is hour, M is minute, S is second, F is sub-second, and all
	 * other characters are literal.
	 * If this method fails to parse the date, the previous date is
	 * retained.
	 * @param iso8601_date An iso-8601 compatible representation of the date.
	 * @return Returns true if the string was successfully parsed.
	 */
	bool fromString(const std::string& iso8601_date);
	bool fromStream(std::istream&);

	/** 
	 * @brief Return the date in seconds since epoch.
	 *
	 * @return The number of seconds since epoch UTC.
	 */
	F64 secondsSinceEpoch() const;

	/** 
	 * @brief Set the date in seconds since epoch.
	 *
	 * @param seconds The number of seconds since epoch UTC.
	 */
	void secondsSinceEpoch(F64 seconds);
    
    /**
     * @brief Create an LLDate object set to the current time.
	 *
	 * @return The number of seconds since epoch UTC.
	 */
    static LLDate now();

	/** 
	 * @brief Compare dates using operator< so we can order them using STL.
	 *
	 * @param rhs -- the right hand side of the comparison operator
	 */
	bool operator<(const LLDate& rhs) const;
    
	/** 
	 * @brief Remaining comparison operators in terms of operator<
     * This conforms to the expectation of STL.
	 *
	 * @param rhs -- the right hand side of the comparison operator
	 */
    bool operator>(const LLDate& rhs) const { return rhs < *this; }
    bool operator<=(const LLDate& rhs) const { return !(rhs < *this); }
    bool operator>=(const LLDate& rhs) const { return !(*this < rhs); }
    bool operator!=(const LLDate& rhs) const { return (*this < rhs) || (rhs < *this); }
    bool operator==(const LLDate& rhs) const { return !(*this != rhs); }

	/**
	 * @brief Compare to epoch UTC.
	 */

	bool isNull() const { return mSecondsSinceEpoch == 0.0; }
	bool notNull() const { return mSecondsSinceEpoch != 0.0; }
	 

private:
	F64 mSecondsSinceEpoch;
};

// Helper function to stream out a date
std::ostream& operator<<(std::ostream& s, const LLDate& date);

// Helper function to stream in a date
std::istream& operator>>(std::istream& s, LLDate& date);


const static std::string weekdays[] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

const static std::string months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};

#endif // LL_LLDATE_H