php mktime

JonD · 6 Nov 2006 at 20:29

I have a date of birth field on a website which is stored in unix timestamp which of course only starts are 1970.

If the user selects a date of birth before this and I try to create a timestamp using mktime() and it results in 0, but what I want is -5631511 (or whatever) so I can work out their age etc.

How can I create a minus timestamp from a given date, eg:

$day = 11
$month = 1;
$year = 1900;

Thx
JD

JonD · 6 Nov 2006 at 20:36

Hmm it should be creating a timetamp actually but it isnt.

mktime(0, 0, 0, 9, 9, 1919);

works

but mktime(0,0,0, (int) $_POST['month'], (int) $_POST['day'], (int) $_POST['year']);isnt

hmm

I just worked out that 1903 is the earliest date I can use before it returns null.

Is it because an integer can only start at -2,147,483,648?

Is there anyway around this?

robmiller · 6 Nov 2006 at 20:59

You have users signing up to your site that are over 103 years old?

JonD · 6 Nov 2006 at 21:01

lol I know people wont be that old but its just id like to know if there is anyway around the problem.

robmiller · 6 Nov 2006 at 21:04

Nope, unfortunately not. You're limited to 1901–2038 on a 32-bit system.

JonD · 6 Nov 2006 at 21:05

thought so, but is going to happen after 2038?

Dfhaii · 7 Nov 2006 at 13:16

We'll probably be using 64 bit machines by then.

robmiller · 7 Nov 2006 at 13:37

Dfhaii said:
We'll probably be using 64 bit machines by then.

In 32 years? I should bloody well hope so.

Dj_Jestar · 7 Nov 2006 at 14:19

"In my day, all we had was 32bits to play with, now look at you pesky kids with your 2048bit shennanigans! You don't know the meaning of limitations!"

paddy · 7 Nov 2006 at 15:16

JonD said:
thought so, but is going to happen after 2038?

The machines take over...it'll be war <dum dum :eek:

> We need Arnie !!