主要问题似乎是获取文件的上次修改时间。我使用下面的代码:
function LastWriteTime(const FileName: string): TFileTime;
var
AttributeData: TWin32FileAttributeData;
begin
if not GetFileAttributesEx(PChar(FileName), GetFileExInfoStandard, @AttributeData) then
RaiseLastOSError;
Result := AttributeData.ftLastWriteTime;
end;
function UTCFileTimeToSystemTime(const FileTime: TFileTime): TSystemTime;
//returns equivalent time in current locality, taking account of daylight saving
var
LocalFileTime: Windows.TFileTime;
begin
Windows.FileTimeToLocalFileTime(FileTime, LocalFileTime);
Windows.FileTimeToSystemTime(LocalFileTime, Result);
end;
function UTCFileTimeToDateTime(const FileTime: TFileTime): TDateTime;
begin
Result := SystemTimeToDateTime(UTCFileTimeToSystemTime(FileTime));
end;
你叫LastWriteTime
获得文件时间格式的最后修改时间。然后拨打UTCFileTimeToDateTime
转换为TDateTime
,说明机器当前的当地时区。然后,您可以将该值与Now
进行比较。
至于格式,你已经知道如何做到这一点。你的基本方法将起作用,你只需要充实细节。
在评论你说
FormatDateTime('dd hh:nn:ss', 2.9);
显示时,你会期望一个2
当天1
。问题是这个函数格式化日期而不是时间间隔。值2.9
不被视为已用时间,而是被视为绝对日期/时间,在德尔福时代后的2.9
天。我将使用Trunc
和Frac
分别获取天数和部分天数,并从那里开始工作。
Days := Trunc(TimeDiff);
Time := Frac(TimeDiff);
下面的代码,直接从我的代码库中提取,可能会给你一些指针。请注意,它的输入是以秒为单位的,但它应该将您设置在正确的路径上。
function CorrectPlural(const s: string; Count: Integer): string;
begin
Result := IntToStr(Count) + ' ' + s;
if Count<>1 then begin
Result := Result + 's';
end;
end;
function HumanReadableTime(Time: Double): string;
//Time is in seconds
const
SecondsPerMinute = 60;
SecondsPerHour = 60*SecondsPerMinute;
SecondsPerDay = 24*SecondsPerHour;
SecondsPerWeek = 7*SecondsPerDay;
SecondsPerYear = 365*SecondsPerDay;
var
Years, Weeks, Days, Hours, Minutes, Seconds: Int64;
begin
Try
Years := Trunc(Time/SecondsPerYear);
Time := Time - Years*SecondsPerYear;
Weeks := Trunc(Time/SecondsPerWeek);
Time := Time - Weeks*SecondsPerWeek;
Days := Trunc(Time/SecondsPerDay);
Time := Time - Days*SecondsPerDay;
Hours := Trunc(Time/SecondsPerHour);
Time := Time - Hours*SecondsPerHour;
Minutes := Trunc(Time/SecondsPerMinute);
Time := Time - Minutes*SecondsPerMinute;
Seconds := Trunc(Time);
if Years>5000 then begin
Result := IntToStr(Round(Years/1000))+' millennia';
end else if Years>500 then begin
Result := IntToStr(Round(Years/100))+' centuries';
end else if Years>0 then begin
Result := CorrectPlural('year', Years) + ' ' + CorrectPlural('week', Weeks);
end else if Weeks>0 then begin
Result := CorrectPlural('week', Weeks) + ' ' + CorrectPlural('day', Days);
end else if Days>0 then begin
Result := CorrectPlural('day', Days) + ' ' + CorrectPlural('hour', Hours);
end else if Hours>0 then begin
Result := CorrectPlural('hour', Hours) + ' ' + CorrectPlural('minute', Minutes);
end else if Minutes>0 then begin
Result := CorrectPlural('minute', Minutes);
end else begin
Result := CorrectPlural('second', Seconds);
end;
Except
Result := 'an eternity';
End;
end;
+1尤其适用于考虑夏令时。 – 2012-05-12 15:09:06
谢谢!但是还是有些问题......'FormatDateTime('dd hh:nn:ss',TimeDiff);'其中TimeDiff ='2.9487917361'(距离文件上次修改和现在差不多3天)给了我01 22:46:15 ' – TheDude
我希望我的最新更新有所帮助。 –