title: Is is possible to trigger an event in mongoDB on a particular timestamp?
body: <p>I need to have a central countdown timer for my website which will be common for all users. </p>
  
  <p>This countdown timer will be reloaded after cycle of <strong>7days</strong>. 
  Which means,the database will have a collection that stores- 
  <em>StartDate: ,StartTime: ,EndDate: , EndTime:</em></p>
  
  <p>And when the endtime is reached one cycle ends and the next cycle of 7days begins for which the same fields are updated. How to trigger command from shell and not from the php code. Also, is it possible to manipulate it using php?</p>