idevicedate(1) General Commands Manual idevicedate(1)NAME
idevicedate - Display the current date or set it on a device.
SYNOPSIS
idevicedate [OPTIONS]
DESCRIPTION
Simple utility to manage the clock on a device.
OPTIONS -d, --debug
enable communication debugging.
-u, --udid UDID
target specific device by its 40-digit device UDID.
-s, --set TIMESTAMP
set UTC time described by TIMESTAMP
-c, --sync
set time of device to current system time
-h, --help
prints usage information
AUTHOR
Martin Szulecki
idevicedate(1)
Check Out this Related Man Page
CLOCKDIFF(8) System Manager's Manual: iputils CLOCKDIFF(8)NAME
clockdiff - measure clock difference between hosts
SYNOPSIS
clockdiff [ -o] [ -o1] destination
DESCRIPTION
clockdiff Measures clock difference between us and destination with 1 msec resolution using ICMP TIMESTAMP [2] packets or, optionally, IP
TIMESTAMP option [3] option added to ICMP ECHO. [1]
OPTIONS -o Use IP TIMESTAMP with ICMP ECHO instead of ICMP TIMESTAMP messages. It is useful with some destinations, which do not support ICMP
TIMESTAMP (f.e. Solaris <2.4).
-o1 Slightly different form of -o, namely it uses three-term IP TIMESTAMP with prespecified hop addresses instead of four term one.
What flavor works better depends on target host. Particularly, -o is better for Linux.
WARNINGS
o Some nodes (Cisco) use non-standard timestamps, which is allowed by RFC, but makes timestamps mostly useless.
o Some nodes generate messed timestamps (Solaris>2.4), when run xntpd. Seems, its IP stack uses a corrupted clock source, which is synchro-
nized to time-of-day clock periodically and jumps randomly making timestamps mostly useless. Good news is that you can use NTP in this
case, which is even better.
o clockdiff shows difference in time modulo 24 days.
SEE ALSO ping(8), arping(8), tracepath(8).
REFERENCES
[1] ICMP ECHO, RFC0792, page 14.
[2] ICMP TIMESTAMP, RFC0792, page 16.
[3] IP TIMESTAMP option, RFC0791, 3.1, page 16.
AUTHOR
clockdiff was compiled by Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>. It was based on code borrowed from BSD timed daemon.
SECURITY
clockdiff requires CAP_NET_RAWIO capability to be executed. It is safe to be used as set-uid root.
AVAILABILITY
clockdiff is part of iputils package and the latest versions are available in source form for anonymous ftp ftp://ftp.inr.ac.ru/ip-rout-
ing/iputils-current.tar.gz.
iputils-020927 27 September 2002 CLOCKDIFF(8)
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