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<TITLE></TITLE>
<META NAME="GENERATOR" CONTENT="LibreOffice 3.5 (Linux)">
<META NAME="AUTHOR" CONTENT="Zoran Vučenović">
<META NAME="CREATED" CONTENT="20100120;12052000">
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<P ALIGN=CENTER STYLE="margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><FONT SIZE=4 STYLE="font-size: 16pt"><B>ZVDateTimeControls
Package for Lazarus</B></FONT></FONT></P>
<P ALIGN=CENTER STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><BR>
</P>
<P ALIGN=CENTER STYLE="margin-bottom: 0cm"><A CLASS="western" HREF="http://wiki.lazarus.freepascal.org/ZVDateTimeControls_Package"><FONT FACE="Arial, sans-serif"><FONT SIZE=3><SPAN LANG="en-US"><SPAN STYLE="font-weight: normal">http://wiki.lazarus.freepascal.org/ZVDateTimeControls_Package</SPAN></SPAN></FONT></FONT></A></P>
<P ALIGN=LEFT STYLE="margin-bottom: 0cm"><BR>
</P>
<P ALIGN=CENTER STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><BR>
</P>
<P ALIGN=LEFT STYLE="margin-bottom: 0cm; font-weight: normal"><FONT FACE="Arial, sans-serif"><FONT SIZE=4>The
ZVDateTimeControls package contains two controls:</FONT></FONT></P>
<P ALIGN=LEFT STYLE="margin-bottom: 0cm"><BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 2cm; margin-bottom: 0cm"><IMG SRC="pictures/TZVDateTimePicker.png" NAME="grafika2" ALIGN=BOTTOM WIDTH=24 HEIGHT=24 BORDER=0><A CLASS="western" HREF="#TZVDateTimePicker">
</A><A CLASS="western" HREF="#TZVDateTimePicker"><FONT FACE="Arial, sans-serif"><FONT SIZE=3><SPAN LANG="en-US"><SPAN STYLE="font-weight: normal">TZVDateTimePicker</SPAN></SPAN></FONT></FONT></A></P>
<P ALIGN=LEFT STYLE="margin-left: 2cm; margin-bottom: 0cm"><BR>
</P>
<P ALIGN=LEFT STYLE="margin-left: 2cm; margin-bottom: 0cm"><IMG SRC="pictures/TDBZVDateTimePicker.png" NAME="grafika5" ALIGN=BOTTOM WIDTH=24 HEIGHT=24 BORDER=0><A CLASS="western" HREF="#TDBZVDateTimePicker">
</A><A CLASS="western" HREF="#TDBZVDateTimePicker"><FONT FACE="Arial, sans-serif"><FONT SIZE=3><SPAN LANG="en-US"><SPAN STYLE="font-weight: normal">TDBZVDateTimePicker</SPAN></SPAN></FONT></FONT></A></P>
<P ALIGN=LEFT STYLE="margin-bottom: 0cm"><BR>
</P>
<P ALIGN=LEFT STYLE="margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>Author</B></FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><A CLASS="western" HREF="http://wiki.lazarus.freepascal.org/User:Zoran"><FONT FACE="Arial, sans-serif"><SPAN LANG="en-US"><SPAN STYLE="font-weight: normal">Zoran
Vučenović</SPAN></SPAN></FONT></A></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>License</B></FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm; font-weight: normal">
<FONT FACE="Arial, sans-serif">Modified LGPL, same as Lazarus
component library.</FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><BR>
</P>
<P ALIGN=LEFT STYLE="margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>Introduction</B></FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><SPAN LANG="en-US">Delphi's
VCL has <A CLASS="western" HREF="http://docwiki.embarcadero.com/VCL/en/ComCtrls.TDateTimePicker">a
control named TDateTimePicker</A>, which I find very useful for
editing dates. LCL, however, does not have this control. Instead, for
editing dates <A CLASS="western" HREF="http://lazarus-ccr.sourceforge.net/docs/lcl/editbtn/tdateedit.html">LCL
has a control named TDateEdit</A>, but I prefer the VCL's
TDateTimePicker.</SPAN></FONT></P>
<P ALIGN=LEFT STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">Therefore,
I tried to create a cross-platform Lazarus control which would
resemble VCL's TDateTimePicker as much as possible.</FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><SPAN LANG="en-US">The
TZVDateTimePicker control does not use <A CLASS="western" HREF="http://msdn.microsoft.com/en-us/library/system.windows.forms.datetimepicker.aspx">native
Win control</A>. It descends from LCL's TCustomControl to be
cross-platform. It has been tested on Windows with win32/64 and qt
widgetsets, as well as on Linux with qt and gtk2 widgetsets.</SPAN></FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">Note
that the TZVDateTimePicker control does not descend from TEdit, so it
does not have unnecessary caret. The VCL's control doesn't have caret
either.</FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>Installation</B></FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">To
install the package in Lazarus IDE follow these steps:</FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><BR>
</P>
<OL>
<OL>
<LI><P STYLE="margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">Open
the package in Package Editor (in Lazarus' main menu click <I>Package</I>,
then <I>Open package file...</I> locate the file
zv<I>datetimectrls.lpk</I> and click <I>Open</I>).</FONT></P>
<LI><P STYLE="margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">Compile
the package (click <I>Compile</I> in Package Editor's tool bar).</FONT></P>
<LI><P STYLE="margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">Install
the package in the IDE (click <I>Install</I> – you will be asked
if you want to rebuild Lazarus, click <I>Yes</I>. Wait until
Lazarus rebuilds and restarts itself. The new tab “<I>Date and
Time Ctrls”</I> appears on the component palette with
TZVDateTimePicker and TDBZVDateTimePicker controls.</FONT></P>
</OL>
</OL>
<P STYLE="margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>Change
Log</B></FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm; font-weight: normal">
<FONT FACE="Arial, sans-serif">For more details about changes, see
ChangeLog.txt</FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm; font-weight: normal">
<FONT FACE="Arial, sans-serif">Version 1.0 – 27. February 2010.</FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm; font-weight: normal">
<FONT FACE="Arial, sans-serif">Version 1.1 – 17. April 2010.</FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm; font-weight: normal">
<FONT FACE="Arial, sans-serif">Version 1.2 – 12. May 2010.</FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm; font-weight: normal">
<FONT FACE="Arial, sans-serif">Version 1.3 – 1. April 2011.</FONT></P>
<P STYLE="margin-left: 1.48cm; margin-bottom: 0cm; font-weight: normal">
<FONT FACE="Arial, sans-serif">Version 1.4 – 4. September 2012.</FONT></P>
<P STYLE="margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-bottom: 0cm"><A NAME="TZVDateTimePicker"></A><FONT FACE="Arial, sans-serif"><B>TZVDateTimePicker
<IMG SRC="pictures/TZVDateTimePicker.png" NAME="grafika9" ALIGN=MIDDLE WIDTH=24 HEIGHT=24 BORDER=0></B></FONT></P>
<P STYLE="margin-left: 0.85cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>Properties:</B></FONT></P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif">I'll explain some properties of
TZVDateTimePicker control: </FONT>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>DateTime: TDateTime (public)</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><SPAN LANG="en-US">The
DateTime value displayed on the control. This property is not
published in object inspector, but its value is actually the same as
Date and Time properties composed in one value. This property is
provided to allow setting or reading of both date and time value at
once in program code. In design time, Date and Time can be set in
object inspector. <A CLASS="western" HREF="#ZVDateTimePicker Editor">There
is also component editor</A> which provides easy way of setting this
property in design time.</SPAN></FONT></P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>Date: TDate</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">The
date displayed on the control which the user can edit.</FONT></P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>Time: TTime</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">The
time displayed on the control which the user can edit.</FONT></P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>MinDate: TDate</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">The
minimal date user can enter.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>MaxDate: TDate</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">The
maximal date user can enter.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm"><A NAME="NullInputAllowed"></A>
<FONT FACE="Arial, sans-serif"><B>NullInputAllowed: Boolean</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">When
True, the user can set the date to NullDate constant by pressing N
key.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>CenturyFrom: Word</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">When
user enters the year in two-digit format, then the CenturyFrom
property is used to determine which century the year belongs to. The
default is 1941, which means that when two digit years is entered, it
falls in interval 1941 – 2040. Note that MinDate and MaxDate
properties can also have influence on the decision – for example,
if the CenturyFrom is set to 1941 and MaxDate to 31. 12. 2010, if
user enters year 23, it will be set to 1923, because it can’t be
2033, due to MaxDate limit.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>Kind: TDateTimeKind</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>type</B>
TDateTimeKind = (dtkDate, dtkTime, dtkDateTime);</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">The
control displays only date, only time or both.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><IMG SRC="pictures/ZVDateControls03.PNG" NAME="grafika4" ALIGN=BOTTOM WIDTH=332 HEIGHT=40 BORDER=0></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>DateMode: TDTDateMode</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>type</B>
TDTDateMode = (dmComboBox, dmUpDown, dmNone);</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><SPAN LANG="en-US">When
DateMode is set to dmComboBox, there is a button on the right side of
the control. When user clicks the button, <A CLASS="western" HREF="http://lazarus-ccr.sourceforge.net/docs/lcl/calendar/tcalendar.html">the
calendar control</A> is shown, allowing the user to pick the date.
When set to dmUpDown, then UpDown buttons are shown.</SPAN></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">In
my opinion the UpDown buttons aren't really useful in this control,
they are provided for compatibility with Delphi's TDateTimePicker. Up
and down keys can always serve for same purpose, so can mouse wheel.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">In
the next picture the first control's DateMode is set to dmComboBox
and the second control's to dmUpDown.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><IMG SRC="pictures/ZVDateControls01.PNG" NAME="grafika1" ALIGN=BOTTOM WIDTH=151 HEIGHT=72 BORDER=0></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">If
DateMode is dmComboBox, when the user clicks on the button a calendar
drops down, allowing the user to pick a date.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>Note:</B>
if Kind property is set to dtkTime, the calendar control is
pointless. Therefore, if DateMode is dmComboBox, the UpDown is shown
instead.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>ShowCheckBox: Boolean</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">When
set, there is a check box on the left side of the control. When
unchecked, the display appears grayed and user interaction with the
date or time is not possible. (The control is still enabled, though,
only in sense that the check box remains enabled).</FONT></P>
<P STYLE="margin-left: 2cm"><IMG SRC="pictures/ZVDateControls02.PNG" NAME="grafika3" ALIGN=BOTTOM WIDTH=116 HEIGHT=35 BORDER=0></P>
<P STYLE="margin-left: 2cm"><BR><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>Checked: Boolean</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">If
ShowCheckBox is set to True, this property determines whether the
check box is checked or not. If ShowCheckBox is False, this property
has no purpose and is automatically set to True.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>DateDisplayOrder: TDateDisplayOrder</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>type</B>
TDateDisplayOrder = (ddoDMY, ddoMDY, ddoYMD, ddoTryDefault);</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><SPAN LANG="en-US">Defines
the order for displaying day, month and year part of the date. When
ddoTryDefault is set, then the controls tries to determine the order
from <A CLASS="western" HREF="http://lazarus-ccr.sourceforge.net/docs/rtl/sysutils/shortdateformat.html">ShortDateFormat
global variable</A>.</SPAN></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><SPAN LANG="en-US">This
is similar to <A CLASS="western" HREF="http://lazarus-ccr.sourceforge.net/docs/lcl/editbtn/tdateedit.dateorder.html">DateEdit's
DateOrder</A> property.</SPAN></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>DateSeparator: String</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">Defines
the string used to separate date, month and year date parts. Setting
this property automatically sets the UseDefaultSeparators property to
False. To ensure that date and time separators are set to user's
system defaults, set UseDefaultSeparators property to True.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>TimeSeparator: String</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">Defines
the string used to separate hour, minute, second and millisecond time
parts. Setting this property automatically sets the
UseDefaultSeparators property to False. To ensure that date and time
separators are set to user's system defaults, set
UseDefaultSeparators property to True.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>UseDefaultSeparators: Boolean</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><SPAN LANG="en-US">When
this property is set to True, then the DateSeparator and
TimeSeparator properties will be set to <A CLASS="western" HREF="http://lazarus-ccr.sourceforge.net/docs/rtl/sysutils/dateseparator.html">DateSeparator</A>
and <A CLASS="western" HREF="http://lazarus-ccr.sourceforge.net/docs/rtl/sysutils/timeseparator.html">TimeSeparator</A>
global variables, which are set to user system defaults when
application initializes.</SPAN></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>TrailingSeparator: Boolean</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">When
set to True, then the DateSeparator is shown once more, after the
last date part. This property exists because in some languages the
correct date format is <B>31. 1. 2010.</B> including the last point,
after the year.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>LeadingZeros: Boolean</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">Determines
whether the date and time parts are displayed with or without leading
zeros (this actually affects day, month and hour parts of date and
time display).</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>TimeDisplay: TTimeDisplay</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>type</B>
TTimeDisplay = (tdHM, tdHMS, tdHMSMs);</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">If
Kind is dtkTime or dtkDateTime, then TimeDisplay value of tdHM means
that only hours and minutes are displayed, tdHMS adds displaying of
seconds and value of tdHMSMs means that milliseconds are displayed
too.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>TimeFormat: TTimeFormat</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>type</B>
TTimeFormat = (tf12, tf24);</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">The
value of tf12 sets the display of time to 12 hours format, with AM/PM
string and tf24 sets to 24 hours format.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0cm"><A NAME="TextForNullDate"></A>
<FONT FACE="Arial, sans-serif"><B>TextForNullDate: String</B></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><SPAN LANG="en-US">Text
which appears when the null date is set and control does not have
focus. When control is focused, the text changes to defined format,
but displaying zeros for date, and nines for time (for example
&quot;00/00/0000 99:99:99&quot;), which is appropriate to user input.
User can set the date to NullDate by pressing N key, provided
<A CLASS="western" HREF="#NullInputAllowed">NullInputAllowed</A>
property is True.</SPAN></FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif">When
TextForNullDate is set to empty string, zeros/nines format is
displayed even when control does not have focus. If you want empty
display, this can be acchieved by setting TextForNullDate to one or
more space characters.</FONT></P>
<P STYLE="margin-left: 2cm; margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<P STYLE="margin-top: 0.18cm; margin-bottom: 0cm"><A NAME="TDBZVDateTimePicker"></A>
<FONT FACE="Arial, sans-serif"><B>TDBZVDateTimePicker
<IMG SRC="pictures/TDBZVDateTimePicker.png" NAME="grafika6" ALIGN=MIDDLE WIDTH=24 HEIGHT=24 BORDER=0></B></FONT></P>
<P STYLE="margin-left: 0.85cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif">TDBZVDateTimePicker is a data-aware
version of TZVDateTimePicker, with nice way of handling null database
values.</FONT></P>
<P STYLE="margin-top: 0.18cm; margin-bottom: 0cm"><BR>
</P>
<H4 CLASS="western" STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0.21cm">
<FONT FACE="Arial, sans-serif"><B>Displaying null values </B></FONT>
</H4>
<DL>
<DL>
<DD STYLE="margin-bottom: 0.5cm"><FONT FACE="Arial, sans-serif">When
the underlying DB field has null value, then:</FONT></DD></DL>
</DL>
<UL>
<UL>
<LI><DD STYLE="margin-bottom: 0.5cm">
<FONT FACE="Arial, sans-serif">When the control gets focus, the
text changes to defined format, but displaying zeros for date parts
and nines for time parts (for example &quot;00/00/0000 99:99:99&quot;),
which is appropriate to user input.</FONT></DD><LI><DD STYLE="margin-bottom: 0.5cm">
<FONT FACE="Arial, sans-serif"><SPAN LANG="en-US">When the control
is not focused, then it displays the text defined in
<A CLASS="western" HREF="#TextForNullDate">TextForNullDate</A>
property. The default is &quot;NULL&quot;.</SPAN></FONT></DD></UL>
</UL>
<H4 CLASS="western" STYLE="margin-left: 1.48cm; margin-top: 0.18cm; margin-bottom: 0.21cm">
<FONT FACE="Arial, sans-serif">Setting the field value to null </FONT>
</H4>
<DL>
<DL>
<DD STYLE="margin-bottom: 0.5cm"><FONT FACE="Arial, sans-serif"><SPAN LANG="en-US">If
<A CLASS="western" HREF="#NullInputAllowed">NullInputAllowed</A>
property is True, the user can set the date and time to null, by
pressing N key. </SPAN></FONT>
</DD></DL>
</DL>
<P STYLE="margin-top: 0.18cm; margin-bottom: 0cm">
<A NAME="ZVDateTimePicker Editor"></A><FONT FACE="Arial, sans-serif"><B>ZVDateTimePicker
Editor</B></FONT></P>
<P STYLE="margin-left: 0.85cm; margin-top: 0.18cm; margin-bottom: 0cm">
<IMG SRC="pictures/ZVDateTimePickerEditor.PNG" NAME="grafika8" ALIGN=BOTTOM WIDTH=404 HEIGHT=188 BORDER=0></P>
<P STYLE="margin-left: 0.85cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif">ZVDateTimePicker Editor is a dialog
which provides easy way to set Date, Time, MinDate and MaxDate
properties in design time. It is invoked when ZVDateTimePicker
control is double-clicked in form designer. It is also shown when the
elipsis (…) button, shown in Date, Time, MinDate and MaxDate
properties in Object inspector, gets clicked.</FONT></P>
<P STYLE="margin-left: 0.85cm; margin-top: 0.18cm; margin-bottom: 0cm">
<BR>
</P>
<P STYLE="margin-top: 0.18cm; margin-bottom: 0cm"><FONT FACE="Arial, sans-serif"><B>Tips</B></FONT></P>
<P STYLE="margin-left: 0.85cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><B>Q:</B> When the date/time value is
null, how to display zeros/nines in user format, no matter whether
the control is focused or not?</FONT></P>
<P STYLE="margin-left: 0.85cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><SPAN LANG="en-US"><B>A:</B></SPAN></FONT>
<FONT FACE="Arial, sans-serif"><SPAN LANG="en-US">Set <A CLASS="western" HREF="#TextForNullDate">TextForNullDate</A>
property to empty string. If TextForNullDate is set to empty string,
then zeros/nines are displayed, same as when the control has focus.</SPAN></FONT></P>
<P STYLE="margin-left: 0.85cm; margin-top: 0.18cm; margin-bottom: 0cm">
<BR>
</P>
<P STYLE="margin-left: 0.85cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><SPAN LANG="en-US"><B>Q:</B></SPAN></FONT>
<FONT FACE="Arial, sans-serif"><SPAN LANG="en-US">When the date/time
value is null, If empty string in <A CLASS="western" HREF="#TextForNullDate">TextForNullDate</A>
property actually sets the display to zeros/nines format, how to set
the control to display nothing?</SPAN></FONT></P>
<P STYLE="margin-left: 0.85cm; margin-top: 0.18cm; margin-bottom: 0cm">
<FONT FACE="Arial, sans-serif"><SPAN LANG="en-US"><B>A:</B></SPAN></FONT>
<FONT FACE="Arial, sans-serif"><SPAN LANG="en-US">Set <A CLASS="western" HREF="#TextForNullDate">TextForNullDate</A>
property to one space character, you will get the empty display.</SPAN></FONT></P>
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