Date picker issue

This thread is resolved. Here is a description of the problem and solution.

Problem:

The date picker was displaying a date one day earlier than the date selected in the calendar (e.g., selecting Feb 4 showed Feb 3 in the input field), even though the WordPress timezone was set correctly. The issue occurred both on localhost and on the production site.

Solution:

The issue was caused by a global date_default_timezone_set('Asia/Manila') call introduced by the QuickBooks PHP SDK. Setting the PHP default timezone to a non-UTC value affected the JavaScript/PHP date handling used by the date picker, resulting in an off-by-one-day shift. Removing this call or keeping the default timezone as UTC resolved the issue and restored correct date selection behavior.

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This topic contains 1 reply, has 1 voice.

Last updated by raffyC 5 days, 8 hours ago.

Assisted by: Christopher Amirian.

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February 4, 2026 at 2:09 am #2846308

raffyC

Hi,

The date picker is showing 1 day before of the selected date in calendar. For example, in the screenshot I selected Feb 4 (today) but shows Feb 3 in the field.
The timezone in WordPress is correct. I tried setting date_default_timezone_set('Asia/Manila'); in functions.php but it didn't work.

It happens in localhost and on the production site.

Thank you.

February 4, 2026 at 6:54 am #2846355

Christopher Amirian

Supporter

Languages: English (English )

Hi,

Thank you for the report. May I ask you to test the same thing on a clean installation below and see if the problem happens there too?

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If yes, please give me the link to the page where you managed to replicate the problem.

If the same thing is not possible to replicate on a clean installation, please start by testing a minimal installation on a staging version of your website:

- IMPORTANT STEP! Create a backup of your website. Or better approach will be to test this on a copy/staging version of the website to avoid any disruption of a live website.
- Switch to the default theme such as "TwentyTwenty" by going to "WordPress Dashboard > Appearance > themes".
- Go to "WordPress Dashboard > Plugins" and deactivate all plugins except:
. Toolset plugins.
- Check if you can still recreate the issue.
- If not, re-activate your plugins one by one and check the issue each time to find out the plugin that causes the problem.

Thanks.

February 4, 2026 at 7:38 am #2846360

raffyC

Thanks. I found the issue is when I set date_default_timezone_set('Asia/Manila') in Quickbooks PHP SDK the datepicker gets 1 day before, it's works fine if UTC or not set.