DatabaseConnection::dateFieldSql in includes/database/database.inc

DatabaseConnection_mysql::dateFieldSql in drivers/database_mysql/database.inc

date_date_views_fields in modules/date/date.module

Implements hook_date_views_fields().

date_type_format in includes/date.inc

Helper function for getting the format string for a date type.

date_views_argument_handler_simple::init in modules/date/views/date_views_argument_handler_simple.inc

Get granularity.

_date_views_fields in modules/date/views/date_views_fields.inc

Identify all potential date/timestamp fields.

date_views_filter_handler_simple::init in modules/date/views/date_views_filter_handler_simple.inc

Provide some extra help to get the operator/value easier to use.