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converting GMT to EST??

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converting GMT to EST?? General Programming Help forum discussing Perl, Python, Scripting and/or any languages that do not fit into any of the categories above.

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  #1  
Old January 1st, 2003, 09:37 PM
Vasarab69 Vasarab69 is offline
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converting GMT to EST??
im using the following coding to put a sentence at the bottom of my pages that tells users when it was last updated:

PHP Code:
// Get the modification date of this PHP file
    $timestamps[] = @getlastmod();
    $timestamps[] = @filemtime("include/all.inc");
    // latest of all of the included files is real Last-Mod date
    $timestamp = max($timestamps);
    
    $tsstring = gmdate("l, F jS, Y - G:ia T", $timestamp);
    
    // Check if the client has same page cached
    if ($_SERVER["HTTP_IF_MODIFIED_SINCE"] == $tsstring) {
        $tsstring = "HTTP/1.1 304 Not Modified";
    }
    // or else inform the user agent what is our last mod date
    else {
        $tsstring = "Last-Modified: " . $tsstring;
    } 


its displaying everything in GMT format (so when it really is 10:30PM and i just updated its really saying itslike 3:15AM....) how do i fix that?
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  #2  
Old January 2nd, 2003, 04:53 AM
hadley hadley is offline
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Trying adding the difference between GMT and EST.

Hadley
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  #3  
Old January 2nd, 2003, 04:57 AM
Vasarab69 Vasarab69 is offline
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to do that do i subtract 5 from the end of the $tsstring var?
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  #4  
Old January 2nd, 2003, 06:07 AM
hadley hadley is offline
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You need to subtract 5 hours from $timestamp, which is measured in seconds. (ie. $timestamp =- 5 * 3600)

Hadley
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  #5  
Old January 2nd, 2003, 05:44 PM
Vasarab69 Vasarab69 is offline
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i inserted the line "$timestamp =- 5;" and now its saying the year is 1969...

PHP Code:
// Get the modification date of this PHP file
    $timestamps[] = @getlastmod();
    $timestamps[] = @filemtime("include/all.inc");
    // latest of the files is real Last-Mod date
    $timestamp = max($timestamps);
    
    $timestamp =- 5;
    
    $tsstring = gmdate("l, F jS, Y - G:ia ", $timestamp);
    
    // Check if the client has same page cached
    if ($_SERVER["HTTP_IF_MODIFIED_SINCE"] == $tsstring) {
        $tsstring = "HTTP/1.1 304 Not Modified";
    }
    // or else inform the user agent what is our last mod date
    else {
        $tsstring = "Last-Modified: " . $tsstring;
    } 


thanks--

p.s., i also tryed "adding" 5 and then it told me the date was JAnuary 1st, 1970...which is fine except its 33 years ago
Last edited by Vasarab69 : January 2nd, 2003 at 05:46 PM.
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  #6  
Old January 3rd, 2003, 02:02 AM
hadley hadley is offline
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Hmmmm. That's odd. Could you please give me the value of $timestamp before and after modification?

Thanks,

Hadley
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  #7  
Old January 3rd, 2003, 02:48 PM
Vasarab69 Vasarab69 is offline
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sure...ive just updated to make sure the time would be both syncronized....

before:

Last-Modified: Thursday, January 2nd, 2003 @ 16:02pm
.....
after:

Last-Modified: Wednesday, December 31st, 1969 @ 11:00am
.....

the first one would almost be fine (other than the fact that it would be like 45 mins off), if it werent being displayed in military time... once again, the code for the 'before' example is below:

PHP Code:
// Get the modification date of this PHP file
    $timestamps[] = @getlastmod();
    $timestamps[] = @filemtime("include/all.inc");
    // latest of the files is real Last-Mod date
    $timestamp = max($timestamps);

    $tsstring = date("l, F jS, Y \@ G:ia ", $timestamp);
    
    // Check if the client has same page cached
    if ($_SERVER["HTTP_IF_MODIFIED_SINCE"] == $tsstring) {
        $tsstring = "HTTP/1.1 304 Not Modified";
    }
    // or else inform the user agent what is our last mod date
    else {
        $tsstring = "Last-Modified: " . $tsstring;
    } 
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