Admin date of birth doesn't factor in user locale set

[extroniks]

Preconditions (*)

1. Magento 2.3.4 (but probably on previous versions also)
2. Login to admin
3. Have locale set to en_GB (UK) for the user

Steps to reproduce (*)

1. Edit a customer
2. Select a date of birth after 12th of a month this year

Expected result (*)

1. Date of birth is valid, you can save the customer

Actual result (*)

1. Validation error happens "The Date of Birth should not be greater than today" because instead of DD/MM/YYYY the date is treated as MM/DD/YYYY

Here is a small composer patch I wrote for this:

--- a/view/base/web/js/lib/validation/rules.js
+++ b/view/base/web/js/lib/validation/rules.js
@@ -1069,12 +1069,12 @@ define([
             $.mage.__('This link is not allowed.')
         ],
         'validate-dob': [
-            function (value) {
+            function (value, param, params) {
                 if (value === '') {
                     return true;
                 }

-                return moment(value).isBefore(moment());
+                return moment.utc(value, params.dateFormat).isSameOrBefore(moment.utc());
             },
             $.mage.__('The Date of Birth should not be greater than today.')
         ]
--
2.17.1

[m2-assistant]

Hi @extroniks. Thank you for your report.
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• Steps to reproduce
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Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento give me 2.4-develop instance - upcoming 2.4.x release

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---

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[extroniks]

@magento give me 2.4-develop instance

[magento-engcom-team]

Hi @extroniks. Thank you for your request. I'm working on Magento 2.4-develop instance for you

[magento-engcom-team]

Hi @extroniks, here is your Magento instance.
Admin access: https://i-27027-2-4-develop.instances.magento-community.engineering/admin_200b
Login: 38c1e601 Password: 0091173fa523
Instance will be terminated in up to 3 hours.

[extroniks]

Reproduced on 2.4:

[m2-assistant]

Hi @sudheers-kensium. Thank you for working on this issue.
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[magento-engcom-team]

✅ Confirmed by @sudheers-kensium
Thank you for verifying the issue. Based on the provided information internal tickets MC-31918 were created

Issue Available: @sudheers-kensium, You will be automatically unassigned. Contributors/Maintainers can claim this issue to continue. To reclaim and continue work, reassign the ticket to yourself.