GRFN_S_DATE_SELECTION is a standard SAP Structure so does not store data like a database table does. It can be used to define the fields of other actual tables or to process "Timeframe details and selection type" Information within sap ABAP programs. This is done by declaring abap internal tables, work areas or database tables based on this Structure. These can then be used to store and process the required data appropriately. i.e. DATA: wa_GRFN_S_DATE_SELECTION TYPE GRFN_S_DATE_SELECTION.
The GRFN_S_DATE_SELECTION table consists of various fields, each holding specific information or linking keys about Timeframe details and selection type data available in SAP. These include TF_YEAR (Timeframe Year), DATE_FROM (Begin Date), DATE_TO (End Date), SEL_TYP (Timeframe Selection Type)... See below for full list along with technical details, documentation, text table, check tables, foreign key relationships, conversion routines, relevant tcodes and example ABAP select code etc. .