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forum.gifForum - iziBasic - Sujet n°994

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iziBasic - iziBasic


Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 257

actif  Sujet n° 994  Date Comparison

le 24/11/2004 @ 22:22
par Mike Featherstone

Anonyme
Before I go and write an overly complex routine to do this (), does anyone know of a simple way of comparing a pair of iziBasic date strings and determining which is the earlier?

Thanks

Mike
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[]   


Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Réponse n° 1
--------
le 24/11/2004 @ 23:05
par aldweb

Anonyme

visiteur
 Hello Mike,

Nice to see you here

The easy way to compare two dates is to put them in this format:
YYYYMMDD (Year Month Day)
And if you want to compare time also:
YYYYMMDDHHmmss (Year Month Day Hour Minute Second)

Example:
' get 24/11/2004 today
D$­­­­=DATE$­­­­
' transform to 20041124
A$­­­­=RIGHT$­­­­(D$­­­­,4)+MID$­­­­(D$­­­­,4,2)+LEFT$­­­­(D$­­­­,2)


Now, you can compare it with any other date formated the same way.
Example:
B$­­­­="20041201"
IF A$­ ­­­< B$­­­­ THEN 
  PRINT "Normal!"
ELSE
  PRINT "Strange..."
ENDIF


I hope my answer helps you

Cheers,

@+
aldweb
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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Réponse n° 2
--------
le 24/11/2004 @ 23:56
par Mike Featherstone

Anonyme

visiteur
 Thanks.

I thought that was the format to use but string manipulation has never been my strong point and I couldn't think my way through it.

I would have ended up with a series of integer conversions - doing things the *very* long way round.


Having written a review that said 'I have a use for iziBasic', I thought it time to go and use it for real!
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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Réponse n° 3
--------
le 25/11/2004 @ 22:07
par aldweb

Anonyme

visiteur
 I think that it is worth writing it for our friendly iziBasic fellows, Mike's great review is here:
http://www.clieuk.co.uk/izibasic.shtml/

Thanks again Mike for this review. For me, this is a great reward to my work.

Cheers

@+
aldweb
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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Réponse n° 4
--------
le 26/11/2004 @ 05:20
par Chuck

Anonyme

visiteur
 I tried similar date manipulation and the MID$­­ function kept returning a null string. I worked around it by using LEFT$­­ to cut off the string on the right and then RIGHT$­­ to pick off the part I needed.
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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Réponse n° 5
--------
le 26/11/2004 @ 21:50
par Mike Featherstone

Anonyme

visiteur
 You're right - 24/04/2004 is returning 200424 rather than 20040424. MID$­­ seems to be malfunctioning.
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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Réponse n° 6
--------
le 26/11/2004 @ 21:53
par aldweb

Anonyme

visiteur
 Thank you guys for the information.
I will check for the bug and work on a fix.

Cheers

@+
aldweb
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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Réponse n° 7
--------
le 26/11/2004 @ 23:19
par aldweb

Anonyme

visiteur
 MID$­­­ is running fine.
It is just a misunderstanding and my own initial mistake given in my sample source code when answering to Mike.

Structure is:
MID$­­­(var$­­­,1st character,last character)
and not
MID$­­­(var$­­­,1st character,nb of characters)

So, my example becomes:
' get 24/11/2004 today
D$­­­­­­­=DATE$­
­­­­­­' transform to 20041124
A$­­­­­­­=RIGHT$­­­­­­­(D$­­­­­­­,4)+MID$­­­­­­­(D$­­­­­­­,4,5)+LEFT$­­­­­­­(D$­­­­­­­,2)


Sorry for the mistake.

@+
aldweb
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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Réponse n° 8
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le 26/11/2004 @ 23:32
par aldweb

Anonyme

visiteur
 Me again: I just checked and I can tell that last character is not BASIC's standard. I will change this to nb of characters in next release.

So, at the end, it's my mistake anyway

@+
aldweb
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Warning: A non-numeric value encountered in /web5/aldweb/www/aldweb_com/www/thread.php on line 497
Réponse n° 9
--------
le 26/11/2004 @ 23:38
par Mike Featherstone

Anonyme

visiteur
 Thanks for the help. I'll use the iziBasic standard for now!
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