Test Valid Date String for JavaScript

Created: Friday, May 31, 2013 20:44:00
Updated: Tuesday, September 17, 2019 00:01:42

Here we check the valid strings for the argument of the Date:: class constructor to create Date object under JavaScript, ie,
<script type="text/javascript">
var objDate;
objDate = new Date("Dec 14, 2019 18:52:40 GMT+0100");
<script>
We are trying to get the PHP date format string to format date time to form the pipeline PHP DateTime() => js Date() => document.write() to output on screen. Here is the summary of cases we tested for you:
#js new Date() FeedIEChromeFirefoxSafariOperaMobile
0Dec 14, 2019 18:52:40 GMT+0100++++++
1Dec 14 2019 18:52:40 GMT+0100++++++
2Dec 14, 2019 18:52:40 GMT+1++++++
32019-12-14 18:52:40 GMT+0100-+--++
42019-12-14 18:52:40 GMT+01:00-+--++
52019-12-14 18:52:40 GMT+100-+--++
614 Dec 2019 18:52:40+01:00-+----
7Dec 14 2019 18:52:40 GMT+1:00-++-++
8Dec 14, 2019 18:52:40 GMT+01:00-++-++
92019-12-14 18:52:40 GMT+1-+--++
102019-12-14 18:52:40-+--++
112019-12-14T18:52:40+01:00+++++-
122019-12-14 18:52:40+01:00-+----
1312-14-2019 18:52:40 GMT+0100++---+
1412/14, 2019 18:52:40 GMT+0100+++-++
1514-Dec-2019 18:52:40 GMT+0100-+-+-+
Tab. I: + Valid Date Time String for Javascript::Date() class, - Invalid.

JavaScript is very English speaking. In effect, among the 3 first universal formats, the English month abbreviation is used. As it can be observed that no pure numerical date string is found like "2019-12-14 18:52:40" to fit JavaScript syntax in all browsers. Please check this with your preferred browser.

Detail of JavaScript Tests

Below, the bold date time outputs at the right hand side of => are the JavaScript Date Class results.

0. Good Format "mmm dd, yyyy hh:mm:ss GMT+0200"

For example, Dec 14, 2019 18:52:40 GMT+0100 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
0Dec 14, 2019 18:52:40 GMT+0100++++++

This format is valid for all browsers in our hands, including Internet Explorer, Google Chrome, Firefox, Safari, Opera, Mobile Safari. On PHP, you get this DateTime format of the current time by

<?php
$objDateTime = new DateTime();
$strDateTime = $objDateTime->format("M d, Y H:i:s \G\M\TO");
?>
One observes that this is the Standard English Date Time expression.

1. Another Good Format "mmm dd yyyy hh:mm:ss GMT+0200"

For example, Dec 14 2019 18:52:40 GMT+0100 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
1Dec 14 2019 18:52:40 GMT+0100++++++

This format is also valid for all browsers in our hands, including IE, Google Chrome, Firefox, Safari, Opera, Safari Mobile. On PHP, you get this DateTime format of the current time by

<?php
$objDateTime = new DateTime();
$strDateTime = $objDateTime->format("M d Y H:i:s \G\M\TO");
?>
One notes that this is another English Date Time expression with timezone.

2. Good Format "mmm dd, yyyy hh:mm:ss GMT+2"

For example, Dec 14, 2019 18:52:40 GMT+1 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
2Dec 14, 2019 18:52:40 GMT+1++++++
As shown, you can shorten the timezone notification.

Bad Formats

All following date time strings are good for some browsers, but unfortunately bad for others.

3. Format "yyyy-mm-dd hh:mm:ss GMT+0200"

For example, 2019-12-14 18:52:40 GMT+0100 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
32019-12-14 18:52:40 GMT+0100-+--++

4. Format "yyyy-mm-dd hh:mm:ss GMT+02:00"

For example, 2019-12-14 18:52:40 GMT+01:00 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
42019-12-14 18:52:40 GMT+01:00-+--++

4. Format "yyyy-mm-dd hh:mm:ss GMT+0200"

For example, 2019-12-14 18:52:40 GMT+01:00 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
52019-12-14 18:52:40 GMT+100-+--++

6. Format "dd mmm yyyy hh:mm:ss+02:00"

For example, 14 Dec 2019 18:52:40+01:00 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
614 Dec 2019 18:52:40+01:00-+----

7. Format "mmm dd yyyy hh:mm:ss GMT+02:00"

For example, Dec 14 2019 18:52:40 GMT+1:00 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
7Dec 14 2019 18:52:40 GMT+1:00-++-++

8. Format "mmm dd, yyyy hh:mm:ss GMT+02:00"

For example, Dec 14, 2019 18:52:40 GMT+01:00 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
8Dec 14, 2019 18:52:40 GMT+01:00-++-++

9. Format "yyyy-mmm-dd hh:mm:ss GMT+2"

For example, 2019-12-14 18:52:40 GMT+1 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
92019-12-14 18:52:40 GMT+1-+--++

10. Format "yyyy-mmm-dd hh:mm:ss"

For example, 2019-12-14 18:52:40 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
102019-12-14 18:52:40-+--++

11. Format "yyyy-mmm-ddThh:mm:ss+02:00"

For example, 2019-12-14T18:52:40+01:00 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
112019-12-14T18:52:40+01:00+++++-
You get this format by PHP5 DateTime=>format('c'). It's regrettable that JavaScript Mobile Safari does not support this format, as this is the universal date time string, used by SQL server, MySQL Server, ...

12. Format "yyyy-mmm-dd hh:mm:ss GMT+02:00"

For example, 2019-12-14 18:52:40+01:00 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
122019-12-14 18:52:40+01:00-+----

13. Format "mm-dd-yyyy hh:mm:ss GMT+0200"

For example, 12-14-2019 18:52:40 GMT+0100 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
1312-14-2019 18:52:40 GMT+0100++---+

14. Format "mm/dd, yyyy hh:mm:ss GMT+0200"

For example, 12/14, 2019 18:52:40 GMT+0100 =>

#js new Date() FeedIEChromeFirefoxSafariOperaMobile
1412/14, 2019 18:52:40 GMT+0100+++-++

JavaScript new Date() running results at one single glance under CCBot/2.0 (https://commoncrawl.org/faq/)

Below, we summarize the date time feed checked above in a single table under your current browser.

#PHP DateTime->formatjs new Date() Feedjs new Date() outputs
0M d, Y H:i:s \G\M\TODec 14, 2019 18:52:40 GMT+0100
1M d Y H:i:s \G\M\TODec 14 2019 18:52:40 GMT+0100
2Dec 14, 2019 18:52:40 GMT+1
3Y-m-d H:i:s \G\M\TO2019-12-14 18:52:40 GMT+0100
4Y-m-d H:i:s \G\M\TP2019-12-14 18:52:40 GMT+01:00
52019-12-14 18:52:40 GMT+100
6d M Y H:i:s \G\M\TP14 Dec 2019 18:52:40+01:00
7Dec 14 2019 18:52:40 GMT+1:00
8M d Y H:i:s \G\M\TPDec 14, 2019 18:52:40 GMT+01:00
92019-12-14 18:52:40 GMT+1
10Y-m-d H:i:s2019-12-14 18:52:40
11c2019-12-14T18:52:40+01:00
12Y-m-d H:i:sP2019-12-14 18:52:40+01:00
13m-d-Y H:i:s\G\M\TO12-14-2019 18:52:40 GMT+0100
14m/d, Y H:i:s\G\M\TO12/14, 2019 18:52:40 GMT+0100
15d-M-Y H:i:s \G\M\TO14-Dec-2019 18:52:40 GMT+0100
Tab II: Real-Time JavaScript Date() Results with different Date time feed. See php.net: date — Format a local time/date.

Here the column "PHP DateTime->format" gives the format string to be used to obtain the "js new Date() Feed" column for JavaScript Date Constructor. The last column "js new Date() outputs" is JavaScript running results given by new Date(Date-Time String):

<script type="text/javascript">
document.write(new Date("Dec 14, 2019 18:52:40 GMT+0100"));
</script>

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