David Smart
NTP Client for the mbed networking libraries. The small change to this version is that there can be only one cause for the return value zero.
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NTPClient
by 
Donatien Garnier
Issue: get_timelastset always returns current time. (Closed: Invalid)
This test code always returns the current time. The expected result is that it would return the time when ntp.set_time( ) was last called. [Need to first verify that set_time is not being called too often]
time_t tls = ntp.get_timelastset();
tls = ntp.timelocal(&tls);
pc.printf(" Last Set: %s\r\n", ntp.ctime(&tls));
Edit: the line in the middle "... ntp.timelocal( )" fetches the current time. Removing that solves this - so it was an application coding error, not a library error.