[erlang-questions] NTP timestamp

[Håkan Stenholm]

József Bérces wrote:
> Hi,
>
> I would like to convert NTP timestamps (seconds elapsed since 00:00:00 January 1st, 1900) to Erlang date/time tuples (UTC). I did not find any such functions in the OTP libraries. It seems that there is no function for converting now() to UTC date and time, either. 
>
> Any help would be welcome.
>
something like this should work, to convert
NTP timestamps (in UTC) to {date(), time()} in UTC:


%% returns: {date(), time()}
NTPtimestamps_to_datetime(NTPSeconds) ->
    %% 1900:01:01 00:00:00 in gregorian seconds
    NTPBase = calendar:datetime_to_gregorian_seconds({1900,1,1}, {0,0,0}),
    GregorianSec = NTPBase + NTPSeconds,
    calendar:gregorian_seconds_to_datetime(Seconds).



the calendar module has the following functions for converting now() to 
UTC {date(), time()}:

now_to_universal_time(Now) -> {Date, Time}
now_to_datetime(Now) -> {Date, Time}


> Thanks,
> Jozsef
>
>
>
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