PHP and JavaScript Dates don't match - Strange anomaly

Question

HTML/PHP:

<button onclick="change_value(<?php echo $date?>)">Go</button>

JavaScript:

function change_value(date_used)
{
    alert(date_used);
}

When I right-click on the button and click the "Inspect Element" button shows the parameter correctly, i.e something like this:

<button onclick="change_value(2012-08-22)">Go</button>

But the alert in the JavaScript is displaying 1981. That's it - only 1981. Not only the date is wrong, but the format, too.

What is this happening and how can I fix it?

Because you passed an expression (2012 - 08 - 22) instead of a string ("2012-08-22") into change_value. It's like asking "Why does print(3-2); output 1?". Use change_value(<?php echo json_encode($date); ?>) instead. — user1233508
– user1233508, Commented Sep 22, 2012 at 10:54
yes , exactly , and you may use a ' instead of json_encode , change_value('<?php echo $date; ?>') — Shahrokhian
– Shahrokhian, Commented Sep 22, 2012 at 10:59
that's because 2012-08-22 = 2012 - 1 - 22 = 1981. Your dat is interpreted as a numeric operation and 08 is interpreted as an octal number (08 = 1 in octal) — gion_13
– gion_13, Commented Sep 22, 2012 at 11:01

vascowhite · Accepted Answer · 2012-09-22 11:27:36Z

4

Change

<button onclick="change_value(<?php echo $date?>)">Go</button>

to this:

<button onclick="change_value('<?php echo $date?>')">Go</button>

You should pass it as string to JavaScript ...

vascowhite

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answered Sep 22, 2012 at 10:53

Night2

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