Why GetDateTimeDecode() does not return milliseconds like
DecodeDateTime()?
lazarus / 43-Android

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Atak_Snajpera · 2022-01-16 20:02

As I workaround I've created this function because Now() on Android
device returns greenwich time (UTC+0) instead of my local time zone
(UTC+1).
Do you know more elegant way of dealing with this issue?
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i function
DateTimeNow():TDateTime;var Day,Month,Year,H,M,S,MS:integer;   
_Day,_Month,_Year,_H,_M,_S,_MS:Word;    MilliSecDiff:int64;   
DateTimeUTC,DateTimeCurrentZone:TDateTime;begin    
 DecodeDateTime(Now,_Year,_Month,_Day,_H,_M,_S,_MS);   
 DateTimeUTC:=EncodeDateTime(_Year,_Month,_Day,_H,_M,_S,0);    
 form1.GetDateTimeDecode(Day,Month,Year,H,M,S);   
 DateTimeCurrentZone:=EncodeDateTime(Year,Month,Day,H,M,S,0);    
 MilliSecDiff:=MilliSecondsBetween(DateTimeUTC,DateTimeCurrentZone);  
   if DateTimeCurrentZone<DateTimeUTC then
MilliSecDiff:=0-MilliSecDiff;   
 Result:=IncMilliSecond(Now,MilliSecDiff); end;

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winni · 2022-01-16 20:35

Hi!

Does this function from sysutils return someting useful??Code: Pascal
 [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i  function
GetLocalTimeOffset: integer
Winni

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engkin · 2022-01-16 21:42

@Atak_Snajpera,

I just tested, Now() gives my local time. It uses GetLocalTime.

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Atak_Snajpera · 2022-01-17 21:58

On Android 9 (Redmi 7) I always get UTC-0 instead of UTC+1 with Now().
On windows Now () works fine.

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engkin · 2022-01-17 22:47

Laz/FPC version?
Are you using LAMW, jvm or something else?

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Atak_Snajpera · 2022-01-18 08:35

My version of Lazarus for Android (LAMW)

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engkin · 2022-01-18 14:56

Your version is old. Now there is an include file for Android, 
rtl/android/unixandroid.inc. If, for whatever reason you can't move to
a newer version, maybe you can use the code related to your time zone
from that file.

It gets the timezone info and local time from libC:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i type   Ptm
= ^tm;   tm = record        tm_sec : longint;        tm_min :
longint;        tm_hour : longint;        tm_mday : longint;       
tm_mon : longint;        tm_year : longint;        tm_wday : longint; 
      tm_yday : longint;        tm_isdst : longint;        case
boolean of          false : (tm_gmtoff : longint;tm_zone : Pchar);   
     true  : (__tm_gmtoff : longint;__tm_zone : Pchar);       
 end; function localtime(t: Ptime_t): Ptm; cdecl; external 'c' name
'localtime'; var  c_tzname: array[0..1] of PAnsiChar; external 'c'
name 'tzname'; function ReadTimeZoneFromLibC: boolean;var  t: time_t; 
tt: Ptm;begin  ReadTimeZoneFromLibC:=False; 
tzname[false]:=c_tzname[0];  tzname[true]:=c_tzname[1];  t:=fptime; 
tt:=localtime(@t);  if tt <> nil then    begin     
tzdaylight:=tt^.tm_isdst <> 0;      tzseconds:=tt^.tm_gmtoff;     
ReadTimeZoneFromLibC:=tzname[false] <> nil;    end;end;