SimpleDateFormat和strtotime之间的区别？

Question

What is the difference between this in PHP

echo strtotime("2013-08-30");

and this in Java

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Date date = sdf.parse("2013-08-30");
System.out.println(date.getTime());

Shouldn't this give me the same number in the end?

EDIT

For example in this case the PHP gives: 1377838800

And Java gives: 1377838800000

Its like PHP loses a few zeroes somewhere along the way

Answer 1

PHP strtotime()

• Parse about any English textual datetime description into a Unix timestamp

Unix timestamp:

• the number of seconds since January 1 1970 00:00:00 UTC

This

echo strtotime("2013-08-30");

will return 1377835200

---

Java Date.getTime()

• Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Date object.

This

System.out.println(date.getTime());

will return 1377831600000 .

Which means you should perform

System.out.println(date.getTime() / 1000);

Also, in case of discrepancies, check your timezones.

Answer 2

No. As documented, strtotime returns the seconds since the Unix epoch; Date.getTime returns the milliseconds since the Unix epoch.

Additionally, you may notice differences in the default time zones used by Java and PHP. (You can set the time zone of a SimpleDateFormat if you want to use a specific one.)

Answer 3

I am not familiar with Java, but the strtotime() function in PHP is exceptionally adept at understanding a date written in pretty much any format that makes sense and returns a date object. I would assume that Java is much more stringent about what inputs you can enter to get the desired result.

From the PHP docs ( http://php.net/manual/en/function.strtotime.php ) on strtotime:

<?php
echo strtotime("now"), "\n";
echo strtotime("10 September 2000"), "\n";
echo strtotime("+1 day"), "\n";
echo strtotime("+1 week"), "\n";
echo strtotime("+1 week 2 days 4 hours 2 seconds"), "\n";
echo strtotime("next Thursday"), "\n";
echo strtotime("last Monday"), "\n";
?>

All these are much more will return a valid date.