Time modification when truncating

I found some issues while aggregating my data and I came up whit this simple Query where I see metabase is changing the time but only for the most recent month.

The example Query is the following:

SELECT shop_id, date_trunc('month', shop_added) as mes, shop_added
FROM shops

And this is the output.

The expected result for the first 3 rows is May 1, 2023, 00:00 but I'm getting April 30, 2023, 23:00

What’s your instance time zone?

My DB is in UTC and Metabase setting transforms everything to America/Mexico City. (-6 Hrs Difference)

please post diagnostic info, have you checked our troubleshooting guide about timezones?

Here is the Diagnostic info

  "browser-info": {
    "language": "es-ES",
    "platform": "MacIntel",
    "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36",
    "vendor": "Google Inc."
  "system-info": {
    "file.encoding": "UTF-8",
    "java.runtime.name": "OpenJDK Runtime Environment",
    "java.runtime.version": "11.0.19+7",
    "java.vendor": "Eclipse Adoptium",
    "java.vendor.url": "https://adoptium.net/",
    "java.version": "11.0.19",
    "java.vm.name": "OpenJDK 64-Bit Server VM",
    "java.vm.version": "11.0.19+7",
    "os.name": "Linux",
    "os.version": "5.4.209-116.363.amzn2.x86_64",
    "user.language": "en",
    "user.timezone": "GMT"
  "metabase-info": {
    "databases": [
    "hosting-env": "unknown",
    "application-database": "postgres",
    "application-database-details": {
      "database": {
        "name": "PostgreSQL",
        "version": "14.2"
      "jdbc-driver": {
        "name": "PostgreSQL JDBC Driver",
        "version": "42.5.1"
    "run-mode": "prod",
    "version": {
      "date": "2023-04-28",
      "tag": "v0.46.2",
      "branch": "release-x.46.x",
      "hash": "8967c94"
    "settings": {
      "report-timezone": "America/Mexico_City"

The thing that is the most weird for me is that in the first picture I share the "mes" column is only modified when "shop added column is MAY and for April dates the date_trunc is giving me the right date