[tor-relays] be in time or not to be in time ?

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Hhm,

found this in the log:

Jun 28 03:58:37.000 [warn] Our clock is 1 minutes, 23 seconds behind the time published in the consensus network status document (2015-06-28 02:00:00 UTC). Tor needs an accurate clock to work correctly. Please check your time and date settings!

NTP runs fine at this exit relay since months, and I found nothing in the log which would tell me that sth was wrong with the time.

Any hints / explanations ?

- -- Toralf pgp key: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 0076 E94E