code: def get_time_interval(time1, time2):
      '''get the interval of two times'''
      try:
          #convert time to timestamp
          time1 = time.mktime(time.strptime(time1, '%Y/%m/%d %H:%M:%S'))
          time2 = time.mktime(time.strptime(time2, '%Y/%m/%d %H:%M:%S'))
          seconds = (datetime.datetime.fromtimestamp(time2) - datetime.datetime.fromtimestamp(time1)).seconds
          #convert seconds to day:hour:minute:second
          days = seconds / 86400
          seconds %= 86400
          hours = seconds / 3600
          seconds %= 3600
          minutes = seconds / 60
          seconds %= 60
          return '%dd %dh %dm %ds' % (days, hours, minutes, seconds)
      except:
          return 'N/Af get_time_interval(time1, time2):
      '''get the interval of two times'''
      try:
          #convert time to timestamp
          time1 = time.mktime(time.strptime(time1, '%Y/%m/%d %H:%M:%S'))
          time2 = time.mktime(time.strptime(time2, '%Y/%m/%d %H:%M:%S'))
          seconds = (datetime.datetime.fromtimestamp(time2) - datetime.datetime.fromtimestamp(time1)).seconds
          #convert seconds to day:hour:minute:second
          days = seconds / 86400
          seconds %= 86400
          hours = seconds / 3600
          seconds %= 3600
          minutes = seconds / 60
          seconds %= 60
          return '%dd %dh %dm %ds' % (days, hours, minutes, seconds)
      except:
          return 'N/A'
docs: get the interval of two times