text: #!/usr/bin/env python
  
  from datetime import datetime, timedelta
  
  minutes = 90
  delta = timedelta(seconds=minutes*60)
  print "delta: %s" % delta
  
  now = datetime.now()
  print "now: %s" % now
  
  later = now + delta
  print "later: %s" % later
  
  earlier = now - delta
  print "earlier: %s" % earlier
  
  