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/**
* @file lldate.h
* @author Phoenix
* @date 2006-02-05
* @brief Declaration of a simple date class.
*
* $LicenseInfo:firstyear=2006&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLDATE_H
#define LL_LLDATE_H
#include <iosfwd>
#include <string>
#include "stdtypes.h"
#include "llunit.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.
*
* @param seconds_since_epoch The number of seconds since UTC epoch.
*/
LLDate(LLUnit<LLUnits::Seconds, 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;
bool split(S32 *year, S32 *month = NULL, S32 *day = NULL, S32 *hour = NULL, S32 *min = NULL, S32 *sec = NULL) const;
std::string toHTTPDateString (std::string fmt) const;
static std::string toHTTPDateString (tm * gmt, std::string fmt);
/**
* @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&);
bool fromYMDHMS(S32 year, S32 month = 1, S32 day = 0, S32 hour = 0, S32 min = 0, S32 sec = 0);
/**
* @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
LL_COMMON_API std::ostream& operator<<(std::ostream& s, const LLDate& date);
// Helper function to stream in a date
LL_COMMON_API std::istream& operator>>(std::istream& s, LLDate& date);
#endif // LL_LLDATE_H
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