Display time of object

[nmedalacabeza]

Code:

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value = event.getvalue()

key_curr = 'ontime_curr'
out_curr = '33/1/31'

key_total = 'ontime_total'
out_total = '33/1/30'

time = storage.get(key_curr)
now = os.time()

if value then
  if not time then
    storage.set(key_curr, now)
    formattime(out_curr, 0)
  end
else
  if time then
    time_total = storage.exec('incrby', key_total, now - time)
    formattime(out_total, time_total)
   
    storage.delete(key_curr)
  end

  grp.update(out_curr, '')
end
---- ---- resident-------------------------------


key_curr = 'ontime_curr'
out_curr = '33/1/31'

key_total = 'ontime_total'
out_total = '33/1/30'

time_curr = storage.get(key_curr)
if time_curr then
 
  time_curr = os.time() - time_curr
  formattime(out_curr, time_curr)
 
  time_total = storage.get(key_total, 0)
  formattime(out_total, time_total - time_curr) -- negative placement
end

Hello, it counts backwards but it doesn't keep the value that I have wrong? Could you put the hours to be subtracted in a group address?
Thank you