SAP CHARACTER DATE TIME documentation, setup help and usage info

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Character-Like Date Fields and Time Fields
The ABAP types d and t are character-like predefined types for data objects that specify dates and times. The date type d describes a character-like local date in the format
"yyyymmdd" . The date type t describes a character-like local date in the format "hhmmss" .

Accessing Character-Like Date Fields and Time Fields

Validity of Character-Like Date Fields and Time Fields