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unit DateTime;
interface
uses
Windows;
const
SecondsPerDay = 24*60*60;
// Days between 1/1/0001 and 12/31/1899
DateDelta = 693594;
// Days between TDateTime basis (12/31/1899) and Unix time_t basis (1/1/1970)
UnixDateDelta = 25569;
// Days between Unix time_t basis (1/1/1970) and Windows timestamp (1/1/1601)
WinDateDelta = 134774; //
function IsLeapYear(Year:word):Boolean;
function EncodeTime(Hour, Minute, Sec: cardinal):TDateTime;
function EncodeDate(Year, Month , Day: cardinal):TDateTime;
function Timestamp(Year,Month,Day:cardinal;Hour:cardinal=0;Minute:cardinal=0;Sec:cardinal=0):dword;
function GetCurrentTimestamp:DWord;
procedure UnixTimeToFileTime(ts:int_ptr; var pft:TFILETIME);
function FileTimeToUnixTime(const pft: TFILETIME):int_ptr;
function TimeStampToLocalTimeStamp(ts:int_ptr):int_ptr;
function TimestampToDateTime(ts:int_ptr):TDateTime;
function TimestampToSystemTime(Time:DWord; var ST:TSystemTime):PSystemTime;
function DateTimeToStr(Time:Dword; Format:pWideChar=nil):pWideChar;
function DateToStr (Time:Dword; Format:pWideChar=nil):pWideChar;
function TimeToStr (Time:Dword; Format:pWideChar=nil):pWideChar;
implementation
uses
common;
type
PDayTable = ^TDayTable;
TDayTable = array [0..11] of byte;
const
MonthDays: array [Boolean] of TDayTable =
((31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31),
(31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31));
function IsLeapYear(Year:word):Boolean;
begin
Result:=(Year mod 4=0) and ((Year mod 100<>0) or (Year mod 400=0));
end;
function EncodeTime(Hour, Minute, Sec: cardinal): TDateTime;
begin
result := (Hour*3600 + Minute*60 + Sec) / SecondsPerDay;
end;
function EncodeDate(Year, Month, Day: cardinal):TDateTime;
var
DayTable: PDayTable;
begin
DayTable := @MonthDays[IsLeapYear(Year)];
dec(Month);
while Month>0 do
begin
dec(Month);
inc(Day,DayTable^[Month]);
end;
dec(Year);
result := Year * 365 + Year div 4 - Year div 100 + Year div 400 + Day - DateDelta;
end;
function Timestamp(Year,Month,Day:cardinal;Hour:cardinal=0;Minute:cardinal=0;Sec:cardinal=0):dword;
var
t:tDateTime;
begin
t := EncodeDate(Year, Month, Day);
if t >= 0 then
t := t + EncodeTime(Hour, Minute, Sec)
else
t := t - EncodeTime(Hour, Minute, Sec);
result:=Round((t - UnixDateDelta) * SecondsPerDay);
end;
function GetCurrentTimestamp:dword;
var
st:tSystemTime;
begin
GetSystemTime(st);
result:=Timestamp(st.wYear,st.wMonth,st.wDay,st.wHour,st.wMinute,st.wSecond);
end;
procedure UnixTimeToFileTime(ts:int_ptr; var pft:TFILETIME);
var
ll:uint64;
begin
ll := (int64(WinDateDelta)*SecondsPerDay + ts) * 10000000;
pft.dwLowDateTime := dword(ll);
pft.dwHighDateTime := ll shr 32;
end;
function FileTimeToUnixTime(const pft: TFILETIME):int_ptr;
var
ll:uint64;
begin
ll := (uint64(pft.dwHighDateTime) shl 32) or pft.dwLowDateTime;
ll := (ll div 10000000) - int64(WinDateDelta)*SecondsPerDay;
result := int_ptr(ll);
end;
function TimeStampToLocalTimeStamp(ts:int_ptr):int_ptr;
var
ft,lft:TFileTime;
begin
UnixTimeToFileTime(ts,ft);
FileTimeToLocalFileTime(ft, lft);
result:=FileTimeToUnixTime(lft);
end;
function TimestampToDateTime(ts:int_ptr):TDateTime;
begin
Result := UnixDateDelta + TimeStampToLocalTimeStamp(ts) / SecondsPerDay;
end;
function TimestampToSystemTime(Time:DWord; var ST:TSystemTime):PSystemTime;
var
aft,lft:TFILETIME;
begin
UnixTimeToFileTime(Time,aft);
FileTimeToLocalFileTime(aft, lft);
FileTimeToSystemTime(lft,ST);
result:=@ST;
end;
function DateTimeToStr(Time:Dword; Format:pWideChar=nil):pWideChar;
var
buf:array [0..300] of WideChar;
ST: TSystemTime;
pc:pWideChar;
begin
TimestampToSystemTime(Time,ST);
GetDateFormatW(LOCALE_USER_DEFAULT,0,@ST,Format,@buf,300);
if Format<>nil then
GetTimeFormatW(LOCALE_USER_DEFAULT,0,@ST,@buf,@buf,300)
else
begin
pc:=StrEndW(@buf); pc^:=' '; inc(pc);
GetTimeFormatW(LOCALE_USER_DEFAULT,0,@ST,nil,pc,300-(pc-pWideChar(@buf)))
end;
StrDupW(result,buf);
end;
function DateToStr(Time:Dword; Format:pWideChar=nil):pWideChar;
var
buf:array [0..300] of WideChar;
ST: TSystemTime;
begin
TimestampToSystemTime(Time,ST);
GetDateFormatW(LOCALE_USER_DEFAULT,0,@ST,Format,@buf,300);
StrDupW(result,buf);
end;
function TimeToStr(Time:Dword; Format:pWideChar=nil):pWideChar;
var
buf:array [0..300] of WideChar;
ST: TSystemTime;
begin
TimestampToSystemTime(Time,ST);
GetTimeFormatW(LOCALE_USER_DEFAULT,0,@ST,Format,@buf,300);
StrDupW(result,buf);
end;
end.
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