Leapsec=201701010000: the last leap second occurred just before 00:00:00 UTCĮxpire=201806280000: the current leap second file says that there definitely will be no new leap second until at least. Whenever a leap second happens, this number will be incremented by one. Tai=37: the current offset between TAI and UTC. Leap=00: no leap second expected today if a leap second will happen at the end of the current UTC day, this will indicate "leap=01" instead. If the NMEATALKER command is set to AUTO, the talker (the first 2 characters after the sign in the log header) is set to GP (GPS satellites only), GL (GLONASS satellites only), GA (Galileo satellites only), GQ (for QZSS satellites only), GB/BD (for BeiDou satellites only) or GN (satellites from multiple systems). If you use the leap second file, you can verify that it works by running this command: $ ntpq -c "rv 0 leap,tai,leapsec,expire" Then the UTC time status is set to VALID. some GPS clock receivers can do it, but not all of them). That NTP server might have a leap file configured, or might be using a reference clock that can provide the leap second warning information (e.g. Or if you sync your time from a NTP server that already has the leap second information, it can pass on the information on upcoming leap seconds to its clients.
#Utc time vs gps time download
If you download an up-to-date list of leap seconds from or one of its mirrors and specify its pathname with the leapfile keyword in your ntp.conffile, then ntpd will know about past and currently-decided future leap seconds, and will inform the kernel as appropriate. ntpd can do that, but only if certain conditions apply: To automatically adjust for leap seconds, you need something that will inform the kernel in advance that a leap second will happen at the end of the current UTC day. That would be necessary only if you have a specific requirement to use TAI (International Atomic Time) as your time base: for most regular uses, UTC is more convenient. Leap second adjustment is not tied to timezones, unless you make the effort of setting your system clock to TAI instead of UTC. or it might mean that between the end of March and the end of October, there will be a Daylight Saving Time switch to BST (British Summer Time) which is UTC +1 hour. If a timezone is specified with just "GMT", it might mean the same as "UTC". So there should be no 1 hour difference.By using the zdump -v command, you can verify that there is no technical difference in the definitions of "UTC" and "GMT" time zones.īut I would still say that UTC is preferred because it unambiguously documents that you're using world-wide Coordinated Universal Time which won't ever observe Daylight Saving Time. The minute discrepancy is due to when I took the screen shots 1 minute apart.Īny ideas why there is a 1 hour time difference? I've tried setting Daylight Savings time on, since we're currently in daylight savings time, but then KStars updates to 17:44, and is two hours off. You can see the time is 15:44 on the mount, and 16:43 in KStars. In KStars, when it syncs, it shows the time +1 hour even though it shows there is no offset, and location and time have updated. This should show UTC correctly without any offset, and on the hand controller it does. Local Timezone is set to 0, and Daylight Savings is set to OFF. The purpose of the measurement is usually either to synchronize an on-time pulse, or to calibrate a frequency source. On the mount hand control, UTC is correctly displayed for date and time. The GPS signals are used in real time to synchronize his local clock and GPS time or UTC (USNO). I use a GPS to obtain Date and time on the Mount. When I connect, it syncs the date and time, but UTC is off by one hour. Best thing is to check a routine or algorithm with the UTC time. In settings, I have it set to obtain date and time from the mount. Wrote my own utc2datenum and discovered that UTC 1263403529 is NOT '1 17:25:29' but 1326475529 is.
#Utc time vs gps time update
I'm having some issues with getting KStars to update to the proper time from the mount.
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