146 lines
2.9 KiB
C++
146 lines
2.9 KiB
C++
/*
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* This file is a part of Winix
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* and is not publicly distributed
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*
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* Copyright (c) 2012-2014, Tomasz Sowa
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* All rights reserved.
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*
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*/
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#ifndef headerfile_winix_core_timezone
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#define headerfile_winix_core_timezone
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#include <ctime>
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#include <map>
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#include "date/date.h"
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#include "space/space.h"
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namespace Winix
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{
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class TimeZone
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{
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public:
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struct Dst
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{
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// true if a time zone has daylight saving time
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bool has_dst;
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// time zone daylight saving time (used if has_dst is true)
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// the 'year' field is the same in 'start' and 'end'
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// start and end are represented in UTC time
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PT::Date start, end;
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// time zone daylight saving time offset
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// used when has_dst is true and the date is whithin start and end
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// this offset should be added to time zone offset
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time_t offset;
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Dst();
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void Clear();
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// checking whether specified 'date' is in the range of <start, end>
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// the year field in date, start and end is ignored
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// has_dst must be true
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bool IsDstUsed(const PT::Date & date) const;
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private:
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// Compare returns zero if date1 and date2 are equal
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// return value less than zero if date1 is lower than date2
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// and a value greater than zero if date1 is greater than date2
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// the year field is ignored
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int Compare(const PT::Date & date1, const PT::Date & date2) const;
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};
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TimeZone();
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/*
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*/
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void Clear();
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/*
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reading zime zone values from Space struct (tz_id is skipped)
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the space struct should have:
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"tz_offset" (long)
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"tz_has_dst" (bool)
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if tz_has_dst is true then also:
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"tz_dst_start" date in the following format: MM:DD HH[:MM[:SS]]
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"tz_dst_end" the same as above
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"tz_dst_offset" (long)
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*/
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bool SetTz(PT::Space & space);
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/*
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converting from UTC to local time
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*/
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time_t CalcLocalOffset(const PT::Date & utc_date);
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time_t ToLocal(time_t utc_time);
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PT::Date ToLocal(const PT::Date & utc_date);
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/*
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converting from local time to UTC
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*/
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time_t CalcUTCOffset(const PT::Date & local_date);
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time_t ToUTC(time_t local_time);
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PT::Date ToUTC(const PT::Date & local_date);
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// return a Dst structure for the specified year
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// or null if it not exists
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// this method can return a Dst structure for earlier year than 'year'
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// if 'year' doesn't exist
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Dst * FindDst(int year);
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// a time zone name
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// this is a key to locale
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std::wstring name;
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// each locale has its own identifier
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size_t id;
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// time zone offset (in seconds)
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time_t offset;
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// daylight saving time map
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// year -> Dst
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// if there is not a specified year we are taking the lower year, e.g.
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// if we are looking for 2010 and there is no such a year then we take 2009
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// (or 2008 if 2009 not exists etc)
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typedef std::map<int, Dst> DstMap;
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DstMap dst_map;
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private:
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time_t ParseStrOffset(const wchar_t * str);
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time_t GetOffset(PT::Space & space);
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bool SetTzDst(PT::Space & year);
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};
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} // namespace Winix
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#endif
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