Handle dates, times, and numbers in WordPress plugins with the modern (5.3+) locale-aware helpers — `wp_date()`, `current_datetime()`, `wp_timezone()`, `get_gmt_from_date()` / `get_date_from_gmt()`, `mysql_to_rfc3339()`, `number_format_i18n()` — and avoid the legacy foot-guns (`current_time('timestamp')` returning offset-summed not-quite-Unix, `date_i18n` quirks, `mysql_to_rfc3339` not actually being RFC3339).
