BRFplus Initial Dates

Hi,

Recently I've found that initial date values are represented in BRFplus by '01.01.0001' (instead of '00.00.0000' in ABAP).

Class CL_FDT_DATE_TIME macro cast_fdt_to_isdt states that:

* // - Date will be set to constant /isdt/if_udtm_c=>gc_date_lower, i.e. 00010101 (like ABAP)

I wonder what is the reason behind it.

Any explanation?