epoch time overflow in stdnse.lua triggered by ssl-cert.nse due to long life certificates

[nmap () bunten de]

Hi,

I got quite a few of these errors while scanning and using ssl-cert NSE 
script:

| NSE: ssl-cert against xx.x.xx.xx:8443 threw an error!
| /usr/local/bin/../share/nmap/nselib/stdnse.lua:408: attempt to
|   perform arithmetic on a nil value
| stack traceback:
|   /usr/local/bin/../share/nmap/nselib/stdnse.lua:408:
|     in function 'date_to_timestamp'
|   /usr/local/bin/../share/nmap/scripts/ssl-cert.nse:196:
|     in function 'output_tab'
|   /usr/local/bin/../share/nmap/scripts/ssl-cert.nse:241:
|     in function </usr/local/bin/../share/nmap/scripts/ssl-cert.nse:235>
|   (...tail calls...)

from nmap/nselib/stdnse.lua ->

| function date_to_timestamp(date, offset)
|   offset = offset or 0
|   return os.time(date) + utc_offset(os.time(date)) - offset  <--- line 408
| end

The certificate just scanned was issued 2014-03-25 and is valid until 
2044-03-17. The certificate was automagically created by an appliance. I 
guess anything beyond 2038-01-19 is problematic due to epoch overflow and
the bug is not confined to the ssl-cert NSE script.

Is there an easy fix?

Regards
Andreas

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