home4u.ch: NTP Servers

NTP Servers

leap second

On 30. June 2012 at 23:59:60 UTC (1. July 2012 at 01:59:60 CEST) a leap second was inserted. This leap second was announced from IERS (International Earth Rotation and Reference Systems Service) on 5. January 2012 in the Bulletin C 43.

To track what the systems were doing during this event, I created a few Shell Scripts for reporting. Below in Reports and Log File Entries are the outputs available.

Reports and Log File Entries

This reports and log file entries below are from the leap second on 30. June 2012 at 23:59:60 UTC (1. July 2012 at 01:59:60 CEST).

ntp1.home4u.ch (a stratum 1 ntp server in CEST with GPS on FreeBSD)
ntp2.home4u.ch (a stratum 1 ntp server in UTC with DCF77 on Gentoo Linux)
ntp3.home4u.ch (a stratum 1 ntp server in CEST with DCF77 on FreeBSD)
gentoo.home4u.ch (a ntp client in UTC on Gentoo Linux)
flashback.wenks.ch (a ntp client in CEST on Mac OS X)

ntp1.home4u.ch was running in CEST on batman.home4u.ch, a FreeBSD 7.4-RELEASE-p9 system with ntpd 4.2.4p5 and GPS 18x LVC.

Output from report-timechange-ntp.sh (reduced to the relevant seconds):

Log of ntp time during 2 minutes with milliseconds:

before time change:
assID=0 status=4464 leap_add_sec, sync_uhf_clock, 6 events, event_peer/strat_chg,
version="ntpd 4.2.4p5-a Wed May 30 16:35:27 CEST 2012 (1)",
processor="amd64", system="FreeBSD/7.4-RELEASE-p9", leap=01, stratum=1,
precision=-19, rootdelay=0.000, rootdispersion=1.126, peer=50663,
refid=PPS, reftime=d39a113a.a1d6e5c7  Sun, Jul  1 2012  1:58:50.632,
poll=6, clock=d39a1144.e25cba32  Sun, Jul  1 2012  1:59:00.884, state=4,
offset=0.043, frequency=39.946, jitter=0.002, noise=0.002,
stability=0.000, hostname="batman.home4u.ch",
signature="md5WithRSAEncryption", flags=0x80003, update=201206302225,
leapsec=201201110000, tai=34,
cert="batman.home4u.ch batman.home4u.ch 0x0", expire=201303221945

Sun, Jul 1 2012 1:59:00.915
Sun, Jul 1 2012 1:59:01.421
Sun, Jul 1 2012 1:59:01.931
Sun, Jul 1 2012 1:59:02.440
Sun, Jul 1 2012 1:59:02.949
...
Sun, Jul 1 2012 1:59:57.030
Sun, Jul 1 2012 1:59:57.540
Sun, Jul 1 2012 1:59:58.046
Sun, Jul 1 2012 1:59:58.556
Sun, Jul 1 2012 1:59:59.065
Sun, Jul 1 2012 1:59:59.578
Sun, Jul 1 2012 1:59:59.085
Sun, Jul 1 2012 1:59:59.594
Sun, Jul 1 2012 2:00:00.105
Sun, Jul 1 2012 2:00:00.615
Sun, Jul 1 2012 2:00:01.135
Sun, Jul 1 2012 2:00:01.641
Sun, Jul 1 2012 2:00:02.151
Sun, Jul 1 2012 2:00:02.907
...
Sun, Jul 1 2012 2:01:02.685
Sun, Jul 1 2012 2:01:04.556
Sun, Jul 1 2012 2:01:05.482
Sun, Jul 1 2012 2:01:08.061
Sun, Jul 1 2012 2:01:09.917

after time change:
assID=0 status=4464 leap_add_sec, sync_uhf_clock, 6 events, event_peer/strat_chg,
version="ntpd 4.2.4p5-a Wed May 30 16:35:27 CEST 2012 (1)",
processor="amd64", system="FreeBSD/7.4-RELEASE-p9", leap=01, stratum=1,
precision=-19, rootdelay=0.000, rootdispersion=1.149, peer=50663,
refid=PPS, reftime=d39a11bb.a5daf630  Sun, Jul  1 2012  2:00:59.647,
poll=6, clock=d39a11c6.d3232fe4  Sun, Jul  1 2012  2:01:10.824, state=4,
offset=0.043, frequency=39.947, jitter=0.002, noise=0.002,
stability=0.000, hostname="batman.home4u.ch",
signature="md5WithRSAEncryption", flags=0x80003, update=201206302225,
leapsec=201201110000, tai=35,
cert="batman.home4u.ch batman.home4u.ch 0x0", expire=201303221945

Output from report-timechange-unix.sh (reduced to the relevant seconds):

Log of unix time during 2 minutes:

Sun Jul  1 01:59:00 CEST 2012
Sun Jul  1 01:59:01 CEST 2012
Sun Jul  1 01:59:01 CEST 2012
Sun Jul  1 01:59:02 CEST 2012
Sun Jul  1 01:59:02 CEST 2012
...
Sun Jul  1 01:59:57 CEST 2012
Sun Jul  1 01:59:57 CEST 2012
Sun Jul  1 01:59:58 CEST 2012
Sun Jul  1 01:59:58 CEST 2012
Sun Jul  1 01:59:59 CEST 2012
Sun Jul  1 01:59:59 CEST 2012
Sun Jul  1 01:59:59 CEST 2012
Sun Jul  1 01:59:59 CEST 2012
Sun Jul  1 02:00:00 CEST 2012
Sun Jul  1 02:00:00 CEST 2012
Sun Jul  1 02:00:01 CEST 2012
Sun Jul  1 02:00:02 CEST 2012
Sun Jul  1 02:00:02 CEST 2012
...
Sun Jul  1 02:01:00 CEST 2012
Sun Jul  1 02:01:01 CEST 2012
Sun Jul  1 02:01:02 CEST 2012
Sun Jul  1 02:01:04 CEST 2012
Sun Jul  1 02:01:05 CEST 2012

Entries in the log file:

Jul  1 02:00:59 batman ntpd[1047]: kernel time sync status change 2001

ntp2.home4u.ch was running in UTC on goliath.home4u.ch, a Gentoo Linux system with kernel 3.2.12, ntpd 4.2.6p5 and DCF77 mouseCLOCK.

Output from report-timechange-ntp.sh (reduced to the relevant seconds):

Log of ntp time during 2 minutes with milliseconds:

before time change:
associd=0 status=4219 leap_add_sec, sync_lf_radio, 1 event, leap_armed,
version="ntpd 4.2.6p5@1.2349-o Sun May  6 15:35:24 UTC 2012 (1)",
processor="x86_64", system="Linux/3.2.12-gentoo", leap=01, stratum=1,
precision=-22, rootdelay=0.000, rootdisp=1.258, refid=DCFa,
reftime=d39a1144.40a83f5c  Sat, Jun 30 2012 23:59:00.252,
clock=d39a1145.ba8c5798  Sat, Jun 30 2012 23:59:01.728, peer=4414, tc=6,
mintc=3, offset=-0.090, frequency=3.226, sys_jitter=0.155,
clk_jitter=0.276, clk_wander=0.011, tai=34, leapsec=201207010000,
expire=201212280000

Sat, Jun 30 2012 23:59:01.744
Sat, Jun 30 2012 23:59:02.246
Sat, Jun 30 2012 23:59:02.748
Sat, Jun 30 2012 23:59:03.250
Sat, Jun 30 2012 23:59:03.752
...
Sat, Jun 30 2012 23:59:57.462
Sat, Jun 30 2012 23:59:57.964
Sat, Jun 30 2012 23:59:58.466
Sat, Jun 30 2012 23:59:58.968
Sat, Jun 30 2012 23:59:59.470
Sat, Jun 30 2012 23:59:59.972
Sat, Jun 30 2012 23:59:59.474
Sat, Jun 30 2012 23:59:59.976
Sun, Jul 1 2012 0:00:00.478
Sun, Jul 1 2012 0:00:00.980
Sun, Jul 1 2012 0:00:01.483
Sun, Jul 1 2012 0:00:01.985
Sun, Jul 1 2012 0:00:02.487
Sun, Jul 1 2012 0:00:02.989
...
Sun, Jul 1 2012 0:00:59.212
Sun, Jul 1 2012 0:00:59.714
Sun, Jul 1 2012 0:01:00.216
Sun, Jul 1 2012 0:01:00.718
Sun, Jul 1 2012 0:01:01.221

after time change:
associd=0 status=021b leap_none, sync_lf_radio, 1 event, leap_event,
version="ntpd 4.2.6p5@1.2349-o Sun May  6 15:35:24 UTC 2012 (1)",
processor="x86_64", system="Linux/3.2.12-gentoo", leap=00, stratum=1,
precision=-22, rootdelay=0.000, rootdisp=2.024, refid=DCFa,
reftime=d39a1183.4094e0e1  Sun, Jul  1 2012  0:00:03.252,
clock=d39a11bd.b95a38e4  Sun, Jul  1 2012  0:01:01.724, peer=4414, tc=6,
mintc=3, offset=-0.108, frequency=3.219, sys_jitter=0.106,
clk_jitter=0.258, clk_wander=0.011, tai=35, leapsec=201207010000,
expire=201212280000

Output from report-timechange-unix.sh (reduced to the relevant seconds):

Log of unix time during 2 minutes:

Sat Jun 30 23:59:01 UTC 2012
Sat Jun 30 23:59:02 UTC 2012
Sat Jun 30 23:59:02 UTC 2012
Sat Jun 30 23:59:03 UTC 2012
Sat Jun 30 23:59:03 UTC 2012
...
Sat Jun 30 23:59:57 UTC 2012
Sat Jun 30 23:59:57 UTC 2012
Sat Jun 30 23:59:58 UTC 2012
Sat Jun 30 23:59:58 UTC 2012
Sat Jun 30 23:59:59 UTC 2012
Sat Jun 30 23:59:59 UTC 2012
Sat Jun 30 23:59:59 UTC 2012
Sat Jun 30 23:59:59 UTC 2012
Sun Jul  1 00:00:00 UTC 2012
Sun Jul  1 00:00:00 UTC 2012
Sun Jul  1 00:00:01 UTC 2012
Sun Jul  1 00:00:01 UTC 2012
Sun Jul  1 00:00:02 UTC 2012
Sun Jul  1 00:00:02 UTC 2012
...
Sun Jul  1 00:00:58 UTC 2012
Sun Jul  1 00:00:59 UTC 2012
Sun Jul  1 00:01:00 UTC 2012
Sun Jul  1 00:01:00 UTC 2012
Sun Jul  1 00:01:01 UTC 2012

Entries in the log file:

Jun 30 23:59:59 goliath kernel: [4172115.751906] Clock: inserting leap second 23:59:60 UTC
Jul  1 00:01:00 goliath ntpd[25915]: parse: convert_rawdcf: parity check FAILED for "-#--#-#-####-#--A--LS------4p1----2P-----212412---1--8---8"
Jul  1 00:01:00 goliath ntpd[25915]: PARSE receiver #0: interval for following error message class is at least 00:01:00
Jul  1 00:01:00 goliath ntpd[25915]: PARSE receiver #0: FAILED TIMECODE: "-#--#-#-####-#--A--LS------4p1----2P-----212412---1--8---" (check receiver configuration / wiring)

ntp3.home4u.ch was running in CEST on superman.wenks.ch, a FreeBSD 7.4-RELEASE-p9 system with ntpd 4.2.4p5 and DCF77 mouseCLOCK.

Output from report-timechange-ntp.sh (reduced to the relevant seconds):

Log of ntp time during 2 minutes with milliseconds:
before time change:
assID=0 status=42f4 leap_add_sec, sync_lf_clock, 15 events, event_peer/strat_chg,
version="ntpd 4.2.4p5-a Wed May 30 16:30:06 CEST 2012 (1)",
processor="amd64", system="FreeBSD/7.4-RELEASE-p9", leap=01, stratum=1,
precision=-19, rootdelay=0.000, rootdispersion=5.174, peer=36828,
refid=DCFa, reftime=d39a1117.3ba7ff30  Sun, Jul  1 2012  1:58:15.233,
poll=10, clock=d39a1145.0c1b6759  Sun, Jul  1 2012  1:59:01.047,
state=4, offset=0.295, frequency=25.359, jitter=2.381, noise=1.239,
stability=0.000, hostname="superman.wenks.ch",
signature="md5WithRSAEncryption", flags=0x80003, update=201206300622,
leapsec=201201110000, tai=34,
cert="superman.wenks.ch superman.wenks.ch 0x0", expire=201303222005

Sun, Jul 1 2012 1:59:01.085
Sun, Jul 1 2012 1:59:01.743
Sun, Jul 1 2012 1:59:02.596
Sun, Jul 1 2012 1:59:03.740
Sun, Jul 1 2012 1:59:04.300
...
Sun, Jul 1 2012 1:59:57.326
Sun, Jul 1 2012 1:59:57.843
Sun, Jul 1 2012 1:59:58.351
Sun, Jul 1 2012 1:59:58.878
Sun, Jul 1 2012 1:59:59.393
Sun, Jul 1 2012 1:59:59.906
Sun, Jul 1 2012 1:59:59.415
Sun, Jul 1 2012 1:59:59.933
Sun, Jul 1 2012 2:00:00.442
Sun, Jul 1 2012 2:00:00.972
Sun, Jul 1 2012 2:00:01.482
Sun, Jul 1 2012 2:00:01.996
Sun, Jul 1 2012 2:00:02.513
Sun, Jul 1 2012 2:00:03.025
...
Sun, Jul 1 2012 2:01:09.492
Sun, Jul 1 2012 2:01:10.004
Sun, Jul 1 2012 2:01:10.517
Sun, Jul 1 2012 2:01:11.051
Sun, Jul 1 2012 2:01:11.587

after time change:
assID=0 status=42f4 leap_add_sec, sync_lf_clock, 15 events, event_peer/strat_chg,
version="ntpd 4.2.4p5-a Wed May 30 16:30:06 CEST 2012 (1)",
processor="amd64", system="FreeBSD/7.4-RELEASE-p9", leap=01, stratum=1,
precision=-19, rootdelay=0.000, rootdispersion=4.988, peer=36828,
refid=DCFa, reftime=d39a1195.3baf223b  Sun, Jul  1 2012  2:00:21.233,
poll=10, clock=d39a11c8.3557d94f  Sun, Jul  1 2012  2:01:12.208,
state=4, offset=-0.545, frequency=25.359, jitter=1.900, noise=1.103,
stability=0.000, hostname="superman.wenks.ch",
signature="md5WithRSAEncryption", flags=0x80003, update=201206300622,
leapsec=201201110000, tai=35,
cert="superman.wenks.ch superman.wenks.ch 0x0", expire=201303222005

Output from report-timechange-unix.sh (reduced to the relevant seconds):

Log of unix time during 2 minutes:

Sun Jul  1 01:59:01 CEST 2012
Sun Jul  1 01:59:01 CEST 2012
Sun Jul  1 01:59:02 CEST 2012
Sun Jul  1 01:59:02 CEST 2012
Sun Jul  1 01:59:03 CEST 2012
...
Sun Jul  1 01:59:57 CEST 2012
Sun Jul  1 01:59:57 CEST 2012
Sun Jul  1 01:59:58 CEST 2012
Sun Jul  1 01:59:58 CEST 2012
Sun Jul  1 01:59:59 CEST 2012
Sun Jul  1 01:59:59 CEST 2012
Sun Jul  1 01:59:59 CEST 2012
Sun Jul  1 01:59:59 CEST 2012
Sun Jul  1 02:00:00 CEST 2012
Sun Jul  1 02:00:00 CEST 2012
Sun Jul  1 02:00:01 CEST 2012
Sun Jul  1 02:00:01 CEST 2012
Sun Jul  1 02:00:02 CEST 2012
Sun Jul  1 02:00:02 CEST 2012
...
Sun Jul  1 02:01:07 CEST 2012
Sun Jul  1 02:01:07 CEST 2012
Sun Jul  1 02:01:08 CEST 2012
Sun Jul  1 02:01:08 CEST 2012
Sun Jul  1 02:01:09 CEST 2012

Entries in the log file:

Jul  1 02:00:21 superman ntpd[24748]: kernel time sync status change 2001
Jul  1 02:01:00 superman ntpd[24748]: parse: convert_rawdcf: parity check FAILED for "-#--#-#-####-#--A--LS------4p1----2P-----212412---1--8---8"
Jul  1 02:01:00 superman ntpd[24748]: PARSE receiver #0: interval for following error message class is at least 00:01:00
Jul  1 02:01:00 superman ntpd[24748]: PARSE receiver #0: FAILED TIMECODE: "-#--#-#-####-#--A--LS------4p1----2P-----212412---1--8---" (check receiver configuration / wiring)
Jul  1 02:02:00 superman ntpd[24748]: synchronized to 2001:8a8:1005:1::8, stratum 1
Jul  1 02:05:43 superman ntpd[24748]: synchronized to GENERIC(0), stratum 0

gentoo.home4u.ch was running in UTC, a Gentoo Linux system with kernel 3.2.12, ntpd 4.2.6p5.

Output from report-timechange-ntp.sh (reduced to the relevant seconds):

Log of ntp time during 2 minutes with milliseconds:

before time change:
associd=0 status=4615 leap_add_sec, sync_ntp, 1 event, clock_sync,
version="ntpd 4.2.6p5@1.2349-o Sun May  6 14:17:50 UTC 2012 (1)",
processor="x86_64", system="Linux/3.2.12-gentoo", leap=01, stratum=2,
precision=-23, rootdelay=0.691, rootdisp=33.628, refid=87.90.14.154,
reftime=d39a0d3d.6ccbcd6c  Sat, Jun 30 2012 23:41:49.424,
clock=d39a1145.e0a228c2  Sat, Jun 30 2012 23:59:01.877, peer=4067, tc=10,
mintc=3, offset=-0.025, frequency=48.838, sys_jitter=0.211,
clk_jitter=0.218, clk_wander=0.031

Sat, Jun 30 2012 23:59:01.881
Sat, Jun 30 2012 23:59:02.385
Sat, Jun 30 2012 23:59:02.888
Sat, Jun 30 2012 23:59:03.391
Sat, Jun 30 2012 23:59:03.895
...
Sat, Jun 30 2012 23:59:57.230
Sat, Jun 30 2012 23:59:57.733
Sat, Jun 30 2012 23:59:58.236
Sat, Jun 30 2012 23:59:58.740
Sat, Jun 30 2012 23:59:59.243
Sat, Jun 30 2012 23:59:59.746
Sat, Jun 30 2012 23:59:59.250
Sat, Jun 30 2012 23:59:59.753
Sun, Jul 1 2012 0:00:00.256
Sun, Jul 1 2012 0:00:00.759
Sun, Jul 1 2012 0:00:01.263
Sun, Jul 1 2012 0:00:01.766
Sun, Jul 1 2012 0:00:02.269
Sun, Jul 1 2012 0:00:02.772
...
Sun, Jul 1 2012 0:00:59.638
Sun, Jul 1 2012 0:01:00.141
Sun, Jul 1 2012 0:01:00.645
Sun, Jul 1 2012 0:01:01.148
Sun, Jul 1 2012 0:01:01.651

after time change:
associd=0 status=061b leap_none, sync_ntp, 1 event, leap_event,
version="ntpd 4.2.6p5@1.2349-o Sun May  6 14:17:50 UTC 2012 (1)",
processor="x86_64", system="Linux/3.2.12-gentoo", leap=00, stratum=2,
precision=-23, rootdelay=0.691, rootdisp=35.443, refid=87.90.14.154,
reftime=d39a0d3d.6ccbcd6c  Sat, Jun 30 2012 23:41:49.424,
clock=d39a11be.27f5cd97  Sun, Jul  1 2012  0:01:02.156, peer=4067, tc=10,
mintc=3, offset=-0.025, frequency=48.838, sys_jitter=0.211,
clk_jitter=0.218, clk_wander=0.031

Output from report-timechange-unix.sh (reduced to the relevant seconds):

Log of unix time during 2 minutes:

Sat Jun 30 23:59:01 UTC 2012
Sat Jun 30 23:59:02 UTC 2012
Sat Jun 30 23:59:02 UTC 2012
Sat Jun 30 23:59:03 UTC 2012
Sat Jun 30 23:59:03 UTC 2012
...
Sat Jun 30 23:59:57 UTC 2012
Sat Jun 30 23:59:57 UTC 2012
Sat Jun 30 23:59:58 UTC 2012
Sat Jun 30 23:59:58 UTC 2012
Sat Jun 30 23:59:59 UTC 2012
Sat Jun 30 23:59:59 UTC 2012
Sat Jun 30 23:59:59 UTC 2012
Sat Jun 30 23:59:59 UTC 2012
Sun Jul  1 00:00:00 UTC 2012
Sun Jul  1 00:00:00 UTC 2012
Sun Jul  1 00:00:01 UTC 2012
Sun Jul  1 00:00:01 UTC 2012
Sun Jul  1 00:00:02 UTC 2012
Sun Jul  1 00:00:02 UTC 2012
...
Sun Jul  1 00:00:59 UTC 2012
Sun Jul  1 00:00:59 UTC 2012
Sun Jul  1 00:01:00 UTC 2012
Sun Jul  1 00:01:00 UTC 2012
Sun Jul  1 00:01:01 UTC 2012

Entries in the log file:

Jun 30 23:59:59 gentoo kernel: [1320862.936994] Clock: inserting leap second 23:59:60 UTC

flashback.wenks.ch was running in CEST, a Mac OS X 10.6.8 system with ntpd 4.2.4p4.

Output from report-timechange-unix.sh (reduced to the relevant seconds):

Log of unix time during 2 minutes:

before time change:
assID=0 status=46f4 leap_add_sec, sync_ntp, 15 events, event_peer/strat_chg,
version="ntpd 4.2.4p4@1.1520-o Mon May 18 19:38:25 UTC 2009 (1)",
processor="x86_64", system="Darwin/10.8.0", leap=01, stratum=2,
precision=-20, rootdelay=0.251, rootdispersion=9.017, peer=51492,
refid=87.90.14.154,
reftime=d39a110d.e3034b86  Sun, Jul  1 2012  1:58:05.886, poll=7,
clock=d39a1144.1e2eb241  Sun, Jul  1 2012  1:59:00.117, state=4,
offset=-1.357, frequency=50.876, jitter=0.656, noise=0.300,
stability=0.009, tai=0

Sun Jul  1 01:59:00 CEST 2012
Sun Jul  1 01:59:00 CEST 2012
Sun Jul  1 01:59:01 CEST 2012
Sun Jul  1 01:59:01 CEST 2012
Sun Jul  1 01:59:02 CEST 2012
...
Sun Jul  1 01:59:57 CEST 2012
Sun Jul  1 01:59:57 CEST 2012
Sun Jul  1 01:59:58 CEST 2012
Sun Jul  1 01:59:58 CEST 2012
Sun Jul  1 01:59:59 CEST 2012
Sun Jul  1 01:59:59 CEST 2012
Sun Jul  1 02:00:00 CEST 2012
Sun Jul  1 02:00:00 CEST 2012
Sun Jul  1 02:00:01 CEST 2012
Sun Jul  1 02:00:01 CEST 2012
Sun Jul  1 02:00:02 CEST 2012
Sun Jul  1 02:00:02 CEST 2012
...
Sun Jul  1 02:00:58 CEST 2012
Sun Jul  1 02:00:59 CEST 2012
Sun Jul  1 02:00:59 CEST 2012
Sun Jul  1 02:01:00 CEST 2012
Sun Jul  1 02:01:00 CEST 2012

after time change:
assID=0 status=46f4 leap_add_sec, sync_ntp, 15 events, event_peer/strat_chg,
version="ntpd 4.2.4p4@1.1520-o Mon May 18 19:38:25 UTC 2009 (1)",
processor="x86_64", system="Darwin/10.8.0", leap=01, stratum=2,
precision=-20, rootdelay=0.251, rootdispersion=10.832, peer=51492,
refid=87.90.14.154,
reftime=d39a110d.e3034b86  Sun, Jul  1 2012  1:58:05.886, poll=7,
clock=d39a11bd.78e6b0ae  Sun, Jul  1 2012  2:01:01.472, state=4,
offset=-1.357, frequency=50.876, jitter=0.656, noise=0.300,
stability=0.009, tai=0

Shell Scripts

report-timechange-ntp.sh

To run the scripts below, add a line to crontab. Something like this for UTC on Linux (adjust path to script, mday, month and e-mail address):

#minute hour    mday    month   wday    command
59      23      30      06      *       /path/to/report-timechange-ntp.sh 2>&1 | /bin/mail -s "ntp time change log leap second (`hostname -s`)" hostmaster@example.com

Or something like this for CEST on FreeBSD (adjust path to script, mday, month and e-mail address):

#minute hour    mday    month   wday    command
59      01      01      07      *       /path/to/report-timechange-ntp.sh 2>&1 | /usr/bin/mail -s "ntp time change log leap second (`hostname -s`)" hostmaster@example.com

FreeBSD (also needs the Ports shells/bash and sysutils/coreutils installed):

#!/usr/local/bin/bash

echo "Log of ntp time during 2 minutes with milliseconds:"
echo
echo "before time change:"
ntpq -c rv
echo
for i in `/usr/local/bin/gseq 0 240`
	do ntptime | awk '/time d3/ {print $3" "$4" "$5" "$6" "$7}' | sed 's/,$//'
	sleep 0.5
done
echo
echo "after time change:"
ntpq -c rv

exit 0

Linux:

#!/bin/bash

echo "Log of ntp time during 2 minutes with milliseconds:"
echo
echo "before time change:"
ntpq -c rv
echo
for i in `seq 0 240`
	do ntptime | awk '/time d3/ {print $3" "$4" "$5" "$6" "$7}' | sed 's/,$//'
	sleep 0.5
done
echo
echo "after time change:"
ntpq -c rv

exit 0

report-timechange-unix.sh

To run the scripts below, add a line to crontab. Something like this for UTC on Linux (adjust path to script, mday, month and e-mail address):

#minute hour    mday    month   wday    command
59      23      30      06      *       /path/to/report-timechange-unix.sh 2>&1 | /bin/mail -s "unix time change log leap second (`hostname -s`)" hostmaster@example.com

Or something like this for CEST on FreeBSD or Mac OS X (adjust path to script, mday, month and e-mail address):

#minute hour    mday    month   wday    command
59      01      01      07      *       /path/to/report-timechange-unix.sh 2>&1 | /usr/bin/mail -s "unix time change log leap second (`hostname -s`)" hostmaster@example.com

FreeBSD (also needs the Ports shells/bash and sysutils/coreutils installed):

#!/usr/local/bin/bash

echo "Log of unix time during 2 minutes:"
echo
for i in `/usr/local/bin/gseq 0 240`
	do date
	sleep 0.5
done

exit 0

Linux:

#!/bin/bash

echo "Log of unix time during 2 minutes:"
echo
for i in `seq 0 240`
	do date
	sleep 0.5
done

exit 0

Mac OS X (also needs MacPorts coreutils installed):

#!/bin/bash

echo "Log of unix time during 2 minutes:"
echo
echo "before time change:"
ntpq -c rv
echo
for i in `/opt/local/bin/gseq 0 240`
	do date
	sleep 0.5
done
echo
echo "after time change:"
ntpq -c rv

exit 0


Document History
20-Jul-2012	Initial publication


home4u.ch	last update 20-Jul-2012

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