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authorDaniel Wilhelm <daniel@wili.li>2014-04-18 17:14:37 +0200
committerDaniel Wilhelm <daniel@wili.li>2014-04-18 17:14:37 +0200
commit8bf668665b107469086f16cb8ad23e47d479d2b4 (patch)
tree66a91ef06a8caa7cd6819dcbe1860693d3eda8d5 /BUILD/Help/html/DaylightSavingTime.html
parent3.21 (diff)
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+<!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="20110301;19000400">
+ <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 }
+ H3 { margin-bottom: 0.21cm }
+ H3.western { font-family: "Arial", sans-serif }
+ H3.cjk { font-family: "MS Mincho" }
+ H3.ctl { font-family: "Mangal" }
+ A:link { so-language: zxx }
+ -->
+ </STYLE>
+</HEAD>
+<BODY LANG="en-US" DIR="LTR">
+<H3 CLASS="western"><FONT FACE="Tahoma, sans-serif"><SPAN STYLE="font-style: normal">Daylight
+saving time </SPAN><SPAN STYLE="font-style: normal"><SPAN STYLE="font-weight: normal">(Windows)</SPAN></SPAN></FONT></H3>
+<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="Rahmen3" DIR="LTR" STYLE="float: left; width: 80%; height: 0.14cm; border: 1px solid #000080; padding: 0.05cm; background: #ccccff">
+ <P ALIGN=LEFT STYLE="margin-bottom: 0cm"><FONT FACE="Tahoma, sans-serif"><B>Note:</B></FONT></P>
+ <UL>
+ <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-bottom: 0cm"><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>
+</BODY>
+</HTML> \ No newline at end of file
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