Infos zum Thema datum
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MySQL :: MySQL 5.0 Reference Manual :: 11.2.3 Comparison Functions and Operators
For best results when using BETWEEN with date or time values, you should use CAST() Examples: If you compare a DATETIME to two DATE values, convert the DATE values to DATETIME values.Keeping your System clock current - Ubuntu Geek
Die Systemzeit in Ubuntu per Network Time Protocol (NTP) automatisch auf dem richtigen Stand halten.