Timezone using the date function

[Anon]

I'm using the following to display the time of the last file modification,...How do I change it so that it displays the time as 12 hours earlier?

echo date("t M Y - g:ia",filemtime("index.shtml"));

[dannys]

This might work:

echo date("t M Y - g:ia",filemtime("index.shtml")-43200);

43200 is the number of seconds in 12hrs

Hope this helps.