Formatdatetime explanation [easy to understand]

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describe

Returns an expression in date or time format .

grammar

FormatDateTime(Date[,NamedFormat])

FormatDateTime The function syntax has the following parts ：

part	describe
Date	Essential . The date expression to be formatted .
NamedFormat	Optional . Numerical value , Indicates the date / The format used by time . If you ignore this value , Then use vbGeneralDate.

Set the value

NamedFormat The setting values of parameters are as follows ：

constant	value	describe
vbGeneralDate	0	Show date and / Or time . If there is a date section , Display in short date format . If there is a time section , Display in long time format . If there are both , Both parts show .
vbLongDate	1	Display the date in the long date format specified in the computer locale value .
vbShortDate	2	Display the date in the short date format specified in the computer locale value .
vbLongTime	3	Display the time in the time format specified in the computer locale value .
vbShortTime	4	use 24 Hour format （hh：mm） Display time .

Windows There are many time formats in , What long date 、 A short date , Two years 、 Four digit year and so on , stay Delphi Available in the FormatDateTime Function outputs these formats , Here's how to use it ：

function FormatDateTime(const Format: string; DateTime: TDateTime): string;

Format Parameter is a formatted string .DateTime Is the time type . The return value is a formatted string , Point of view Format Instruction characters in parameters ：

c Display time in short time format , That is, it is all the representation of numbers

FormatdateTime(‘c’,now);

Output is ：2004-8-7 9:55:40

d Corresponds to the date in the time , If the date is one digit, one digit will be displayed , Two digits show two

FormatdateTime(‘d’,now);

The output may be 1～31

dd and d It means the same thing , But it is always displayed in two digits

FormatdateTime(‘dd’,now);

The output may be 01～31

ddd It shows the day of the week

FormatdateTime(‘ddd’,now);

Output is : Saturday

dddd and ddd It shows the same .

But the above two may be different in other countries .

ddddd Display year, month and day in short time format

FormatdateTime(‘ddddd’,now);

Output is ：2004-8-7

dddddd Display year, month, and day in a long format

FormatdateTime(‘dddddd’,now);

Output is ：2004 year 8 month 7 Japan

e/ee/eee/eeee Display the year in corresponding digits

FormatdateTime(‘ee’,now);

Output is ：04 （ Express 04 year ）

m/mm/mmm/mmmm Represents the month

FormatdateTime(‘m’,now);

Output is ：8

FormatdateTime(‘mm’,now);

Output is 08

FormatdateTime(‘mmm’,now);

Output is August

FormatdateTime(‘mmmm’,now);

Output is August

and ddd/dddd equally , It may be different in other countries

yy/yyyy Indicate year

FormatdateTime(‘yy’,now);

Output is 04

FormatdateTime(‘yyyy’,now);

Output is 2004

h/hh,n/nn,s/ss,z/zzz Hours, respectively , branch , second , millisecond

t Display time in short time format

FormatdateTime(‘t’,now);

Output is 10:17

tt Display time in long format

FormatdateTime(‘tt’,now);

Output is 10:18:46

ampm Show morning or afternoon in a long format

FormatdateTime(‘ttampm’,now);

Output is ：10:22:57 In the morning

If you want to in Format Add ordinary string , You can use double quotation marks to separate those characters with specific meanings , In this way, if the ordinary string contains special characters, it will not be displayed in time format ：

FormatdateTime(‘”today is” c’,now);

Output is ：today is 2004-8-7 10:26:58

You can also add ”-“ or ”\” To separate the dates ：

FormatdateTime(‘”today is” yy-mm-dd’,now);

FormatdateTime(‘”today is” yy\mm\dd’,now);

Output is ： today is 04-08-07

It can also be used. ”:” To separate the time

FormatdateTime(‘”today is” hh:nn:ss’,now);

Output is ：today is 10:32:23

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