s6-networking
Software
skarnet.org
 The s6-clockview program 
s6-clockview prints the time discrepancy between the local
system clock and the time provided by a time server.
 Interface 
     s6-taiclock server | s6-clockview
 -  s6-clockview reads its stdin, expecting input from a program such as
s6-taiclock or
s6-sntpclock (which get time from a
time server). 
 
 -  It prints the local system time, and the time given by the
server, in human-readable form, then exits 0.