Can Javascript Find And Replace Digit Dates to Formatted Dates?

Question

can someone help me with a javascript regex question? I am trying to replace all the digit dates in a string to a formatted version. This is what I have so far

txt = txt.replace(/\d{10}/g, 'Formatted Date Here');

Is this possible? Any help is greatly appreciated! Thanks!

What is the format of the 10 digit date value? Is that seconds since epoch or something else? — cletus
– cletus, Commented Mar 10, 2010 at 6:44

Gumbo · Accepted Answer · 2010-03-10 07:25:40Z

3

Try this:

str = str.replace(/\d{10}/g, function($0) {
    return new Date($0*1000);
});

Date accepts a time in milliseconds. That’s why you multiply the match (passed in $0) with 1000.

If you want a different format than the default format, take a look at the methods of a Date instance. Here’s an example:

str = str.replace(/\d{10}/g, function($0) {
    var d = new Date($0*1000);
    return (d.getMonth() + 1) + ", " + d.getDate() + ", " + (d.getHours() % 12 || 12) + ":" + d.getMinutes() + " " + (d.getHours() < 12 ? 'AM' : 'PM');
});

The JavaScript Date.format functon Amarghosh posted here might help you.

edited Mar 10, 2010 at 7:25

answered Mar 10, 2010 at 6:57

Gumbo

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3 Comments

Mark Anderson Over a year ago

Is there a way that the date could be formatted to say Month, Day, Year, Hour:Min AM/PM ? I'm very confused how multiplying $0 * 1000 arrives at Sat Feb 14 2009 07:31:30 GMT+0800

Mark Anderson Over a year ago

Thank you! The d.getMonth() + 1 threw me off at first because I was unsure why I kept getting 2. This make a lot of sense. Thanks!

Gumbo Over a year ago

@Mark Anderson: You should really take a look at the instance methods (see developer.mozilla.org/en/Core_JavaScript_1.5_Reference/…). They are all explained.

cletus · Accepted Answer · 2010-03-10 07:08:49Z

1

You can use replace() with a function callback to achieve this:

var txt = "This is a test of 1234567890 and 1231231233 date conversion";
txt = txt.replace(/\d{10}/g, function(s) {
  return new Date(s * 1000);
});
alert(txt);

outputs:

This is a test of Sat Feb 14 2009 07:31:30 GMT+0800 and Tue Jan 06 2009 16:40:33 GMT+0800 date conversion

You will need to adjust this to use the correct date format. Also you will need to consider the issue of time zones. The time zone on the client isn't necessarily the same as that on the server.

You might even be better off formatting the date on the server to avoid such issues.

edited Mar 10, 2010 at 7:08

answered Mar 10, 2010 at 6:31

cletus

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3 Comments

Mark Anderson Over a year ago

Neat, thanks for your response, however I'm still a bit confused on how to implement preg_replace_callback() How would I use it to immediately replace numbers like 18295732 to strings like March 7, 1990

Jimmy Over a year ago

javascript built-in replace has allowed a function in the 'replacement' parameter since version 1.3

Mark Anderson Over a year ago

Thank you very much for your reply, this is a major breakthrough! The digits I would like to convert are in the structure of a php timestamp.

Amarghosh · Accepted Answer · 2010-03-10 06:39:34Z

0

Are you sure you want to use regex? Here is a JavaScript Date format function that you might want to check out.

answered Mar 10, 2010 at 6:39

Amarghosh

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