HTTP Time Protocol
HTTP Time Protocol is a time synchronization tool that uses Web server responses (HTTP headers) instead of the NTP protocol. If you are behind a corporate firewall, NAT device, or proxy server, HTP will still be able to synchronize the time. For high precision time synchronization, use ntpd.
| Tags | Internet Web Networking Time Synchronization |
|---|---|
| Licenses | Freeware |
| Operating Systems | Windows Windows Cygwin Unix POSIX Linux |
| Implementation | Perl C |
Recent releases
- 13 Oct 2008 21:08
Changes: A memory issue has been fixed.
- 02 Sep 2008 21:06
Changes: A logic error that rendered 1.0.2 broken has been fixed.
- 01 Sep 2008 22:48
Changes: A buffer overflow has been fixed.
- 28 Apr 2008 13:19
Changes: This release adds "burst mode" (-b) to enhance accuracy. The debug output has been extended. Potential buffer overflow vulnerabilities have been fixed. usleep has been replaced by nanosleep (which is more portable). Debian support is included.
- 31 Oct 2007 09:48
Changes: This release fixes an issue with the clock being set incorrectly on Microsoft Windows during Daylight Savings Time.
- All comments
Recent commentsRe: Nice idea!
> But using this snippet works fine, too
> ;-)
>
> date -s "`lynx -dump -head
> http://www.kernel.org |grep 'Date:'|awk
> -F': ' '{print $2}'`"
HTP (atleast the C version) does basic statistical analysis to use multiple sources to create a more accurate time.
Re: Nice idea!
> I suppose if you ran that every minute
> you may not have any jumps, but the
> feature of smooth adjustment is good for
> less frequent polling.
The C version of htpd is doing smooth adjustments (since version 0.3.4) in stead of time steps, simular to ntpd.
Re: Nice idea!
> But using this snippet works fine, too
> ;-)
>
> date -s "`lynx -dump -head
> http://www.kernel.org |grep 'Date:'|awk
> -F': ' '{print $2}'`"
I suppose if you ran that every minute you may not have any jumps, but the feature of smooth adjustment is good for less frequent polling.
Although, wouldn't an HTTP extension to the rdate code be effective?
Re: Nice idea!
date -s "`lynx -dump -head http://www.kernel.org|awk -F': ' '/Date: / {print $2}'`"
to make it even shorter
Re: Nice idea!
Agreed, but you don't do boundary checking and your version is less friendly for non-programmers.
You are more than welcome to write a slick version in C.
It's the idea that counts :)