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diff --git a/BUILD/Help/html/Daylight Saving Time.html b/BUILD/Help/html/Daylight Saving Time.html new file mode 100644 index 00000000..d088d807 --- /dev/null +++ b/BUILD/Help/html/Daylight Saving Time.html @@ -0,0 +1,80 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<HTML> +<HEAD> + <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=windows-1252"> + <TITLE></TITLE> + <META NAME="GENERATOR" CONTENT="OpenOffice.org 3.2 (Win32)"> + <META NAME="CREATED" CONTENT="20091208;20054200"> + <META NAME="CHANGED" CONTENT="20120511;23112900"> + <META NAME="Info 1" CONTENT=""> + <META NAME="Info 2" CONTENT=""> + <META NAME="Info 3" CONTENT=""> + <META NAME="Info 4" CONTENT=""> + <STYLE TYPE="text/css"> + <!-- + @page { margin: 2cm } + P { margin-bottom: 0.21cm } + H2.cjk { font-family: "SimSun" } + H2.ctl { font-family: "Mangal" } + A:link { so-language: zxx } + --> + </STYLE> +</HEAD> +<BODY LANG="en-US" DIR="LTR"> +<H2 CLASS="western"><FONT FACE="Tahoma, sans-serif"><FONT SIZE=4 STYLE="font-size: 15pt"><SPAN STYLE="font-style: normal">Daylight +saving time </SPAN><SPAN STYLE="font-style: normal"><SPAN STYLE="font-weight: normal">(Windows)</SPAN></SPAN></FONT></FONT></H2> +<P STYLE="margin-bottom: 0cm"><BR> +</P> +<P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif">A +common problem synchronization software has to deal with are +-1 hour +file time shifts after a Daylight Saving Time (DST) switch has +occurred. This can be observed for example when a FAT-formatted +volume is compared against an NTFS volume as frequently happening +with USB memory sticks. Files that previously appeared to be in sync +are now shown with an one hour modification time offset, although +they have not been modified by the user or by other means.</FONT></P> +<P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif">The +reason for this strange behavior lies in the way NTFS and FAT drives +store file times: NTFS stores time in UTC format, while FAT uses +local time.</FONT></P> +<P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif">When +times stored in these two different formats are compared, one format +has to be converted into the other first. In both cases Windows uses +the current DST status as well as current time zone information for +its calculations. Consequently the result of this comparison is +dependent from current system settings and in particular file times +that used to be the same can show up as different after a DST switch.</FONT></P> +<P STYLE="margin-bottom: 0cm"><BR> +</P> +<P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif">For a +detailed discussion about this issue refer to: +<A HREF="http://www.codeproject.com/KB/datetime/dstbugs.aspx">http://www.codeproject.com/KB/datetime/dstbugs.aspx</A></FONT></P> +<P STYLE="margin-bottom: 0cm"><BR> +</P> +<P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif"><B>Solution:</B></FONT></P> +<P STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif">Luckily +FreeFileSync users need not to worry about this issue. Each file on a +FAT volume automatically gets additional meta data encoded in its +creation date that enables a correct file time calculation. This not +only solves all DST issues but also time shifts that occur due to +travel between different time zones.</FONT></P> +<P STYLE="margin-bottom: 0cm"><BR> +</P> +<P STYLE="margin-left: 1.46cm; margin-bottom: 0cm"><SPAN ID="Rahmen1" DIR="LTR" STYLE="float: left; width: 80%; height: 0.14cm; border: 1px solid #000080; padding: 0.05cm; background: #ccccff"> + <UL> + <P ALIGN=LEFT STYLE="margin-right: 0.98cm; margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif"><B>Note</B></FONT></P> + <LI><P ALIGN=LEFT STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif">In + order for FreeFileSync to start handling DST and timezone + differences, an initial full synchronization is required. + Subsequent syncs will never show a time difference again.</FONT></P> + <LI><P ALIGN=LEFT STYLE="margin-right: 0.98cm; margin-bottom: 0cm; font-style: normal"> + <FONT FACE="Tahoma, sans-serif">If a FAT volume is scanned the + first time by FreeFileSync this will take longer than usual since + additional meta data is written for each file.</FONT></P> + </UL> +</SPAN><BR CLEAR=LEFT><BR> +</P> +<P STYLE="margin-bottom: 0cm"><BR> +</P> +</BODY> +</HTML>
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