version 4.4.5.2
Language french
Calc
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You can format the cell(s) as Text or start with a apostrophe (’).
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Check in Tools-Options-Language Settings-Languages to change the “Date Acceptance Patterns” to something without /. In French there is / and - as separaters accepted.
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If you use none date digits (e.g. 13/34) Calc switches automatically to text.