mktime()

[stijn0713]

My friend a I have to different numbers when we echo mktime(0,0,0,5,12,1990).

 

How is this possible?

 

I thought that only, we you leave some parameters blank, the local this is used, else, it's standardized.

 

thanks in advance

[scootstah]

I get 642484800. What do you get?

[PFMaBiSmAd]

mktime uses your current timezone setting when interpreting the date/time parameters. It will give you the Unix time that date/time occurred at in your timezone.

[stijn0713]

I get 642484800. What do you get?

 

I get for example: 642520800

[xyph]

Try setting same time-zones on both machines

 

date_default_timezone_set

 

Unix timestamps are based on the seconds since 1970-1-1 00:00:00 UTC

[stijn0713]

unix epoch is January 1 1970 00:00:00 GMT

 

so i thought mktime() will automatically give the seconds in GMT.

 

if i get in well, the interpretation is that, suppose i live in GMT +2, January 1 1970 00;00;00 has occured 2 hours earlier and therefor mktime(0,0,0,12,5,1990) will return 2 hours or 7200 seconds later?

 

I find this strange why it's not standardized.

[PFMaBiSmAd]

See: gmmktime

[xyph]

unix epoch is January 1 1970 00:00:00 GMT

 

so i thought mktime() will automatically give the seconds in GMT.

 

if i get in well, the interpretation is that, suppose i live in GMT +2, January 1 1970 00;00;00 has occured 2 hours earlier and therefor mktime(0,0,0,12,5,1990) will return 2 hours or 7200 seconds later?

 

I find this strange why it's not standardized.

 

It is standardized. Generally, a programmer won't want a value in GMT time, they'll want it in a specific time-zone.

 

As PFMaBiSmAd pointed out, they have a function to return a Unix time-stamp without an automatic time-zone adjustment being made.

 

<?php

date_default_timezone_set( 'America/Vancouver' );

echo mktime(0,0,0,1,1,2000).'<br>';
// 946713600

date_default_timezone_set( 'GMT' );

echo mktime(0,0,0,1,1,2000).'<br>';
// 946684800

echo gmmktime(0,0,0,1,1,2000);
// 946684800

?>

[stijn0713]

ok, ty. all set