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# 1    php calculate number of days between two dates                  
Dude
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I have a simple idea to calculate number of days between two dates:
$date1 = "2010-01-12";
$date2 = "2009-01-12";

$days = floor(strtotime($date1)-strtotime($date2)/3600/24);

Hope this helps.
Hits: 296, Date: 2010-01-16 02:34:07
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# 2    is the return value of strtotime() timestamp?                  
linlin
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the 3600 should be the seconds of one hour, 24 should be the hours of one day, then the different between the timestamp diveded by 3600 and 24, should be the number of days.

What happen if we use round() instead of floor()?
Hits: 294, Date: 2010-01-16 02:38:52
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# 3    floor( ) round fraction down                  
luke1
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ceil() round fraction up

round(), round the number less than 0.5 down, round the number larger than 0.5 up.

so, in this case, i believe all of floor(), round() and ceil() can be used.
Hits: 292, Date: 2010-01-16 02:45:34
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# 4    regarding number and data type, i got another question                  
linlin
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what is the different between float and double?
I found the data types in mysql database design.
Hits: 290, Date: 2010-01-16 02:51:27
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