In MongoDB, there are some modifiers like "$inc". In the documentation, i didn't found any modifier like "$datetime" or "$timestamp" to set a system date/time or -timestamp. Did you know if there is a way in MongoDB to set a system date/time like in the most RDBMS? Thanks! 2009-11-19 16:05:14.605 2009-11-19 16:05:12.943