When I set the time zone and calculated the week number, the result was incorrect.

[paulgao]

Description

The following code:

date_default_timezone_set('UTC');

echo date('Y-m-d H:i:s', 1640972671) . "\r\n";
echo date('Y-W', 1640972671) . "\r\n";

date_default_timezone_set('Asia/Shanghai');

echo date('Y-m-d H:i:s', 1640972671) . "\r\n";
echo date('Y-W', 1640972671) . "\r\n";

Resulted in this output:

2021-12-31 17:44:31
2021-52
2022-01-01 01:44:31
2022-52

But I expected this output instead:
2021-12-31 17:44:31
2021-52
2022-01-01 01:44:31
2021-52

PHP Version

7.4.33 and 8.4.3

Operating System

No response

[cmb69]

'W' is the ISO 8601 week number of year; you need to use that with 'o' instead of 'Y'. See https://3v4l.org/R2RPC.

[paulgao]

OK,THX.