[PHP] date math question

[Charles Kline]

I am storing my dates as unix timestamp (epoch). Am I right in assuming 
that if I need to add or subtract days from this it is done in seconds?

So for example if I have the timestamp 1041397200 and I wanted to 
subtract 24 hours from it I would do this:

$newtime = $orig_time - 86400;

Thanks,
Charles
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