Date conversion problems

Hi,everyone,I have a problem I need help with.
Table data looks like this:

I want to split the date field into two fields, year and Month.So I did the following:

However, after join the table at last, the date field will follow the format of the first table. How to solve this problem?
Or give me another idea, thank you ~

Hi @jesse1
Post "Diagnostic Info" from Admin > Troubleshooting.

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"vendor": "Google Inc."
"system-info": {
"file.encoding": "UTF-8",
"": "Java(TM) SE Runtime Environment",
"java.runtime.version": "1.8.0_112-b15",
"java.vendor": "Oracle Corporation",
"java.vendor.url": "",
"java.version": "1.8.0_112",
"": "Java HotSpot(TM) 64-Bit Server VM",
"java.vm.version": "25.112-b15",
"": "Linux",
"os.version": "3.10.0-862.3.2.el7.x86_64",
"user.language": "en",
"user.timezone": "US/Pacific"
"metabase-info": {
"databases": [
"hosting-env": "unknown",
"application-database": "mysql",
"application-database-details": {
"database": {
"name": "MySQL",
"version": "8.0.21"
"jdbc-driver": {
"name": "MariaDB Connector/J",
"version": "2.6.2"
"run-mode": "prod",
"version": {
"tag": "v0.37.4",
"date": "2020-12-17",
"branch": "release-x.37.x",
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@jesse1 I have created an issue for this: - upvote by clicking :+1: on the first post