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gnutls_global_set_time_function - API function
#include <gnutls/gnutls.h> void gnutls_global_set_time_function(gnutls_time_func time_func);
gnutls_time_func time_func it's the system time function
This is the function where you can override the default system time function. gnutls_time_func is of the form, time_t (*gnutls_time_func)( time*);
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The full documentation for gnutls is maintained as a Texinfo manual. If the info and gnutls programs are properly installed at your site, the command info gnutls should give you access to the complete manual.