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NetTime is a Simple Network Time Protocol (SNTP) client for Windows 95/98/Me/NT/2000/XP/Vista/7/8/10 and Server 2003/2008/2012/2016. (32 bit and 64 bit operating systems are both supported)
If you're looking for a program to keep your system time accurate, you've just found it!
Its main attributes are:
NetTime was originally written by Graham Mainwaring in 1997 with an open source release made in 1998. Graham made a number of updates to the program until he lost interest and finally abandoned the project officially on the 1st of July 2004.
The NetTime project has been resurrected by myself, Mark Griffiths, and I'm now making an updated version available here:
If you find NetTime useful, please consider making a donation to show your appreciation and to encourage further development of NetTime!
Version 3.20 Alpha 1 - Previous Test Version:
Version 3.20 Alpha 3 - Latest Test Version:
Previous versions as well as the source code can be downloaded from the SourceForge project page
Note: When upgrading from a previous version, you will need to shut down both the NetTime Service as well as the Tray Icon before running the installer. If you uninstall the old version first, you will need to restart your computer before starting the new installer.
NetTime is failing to sync - it reports that all servers failed: The most common cause of this error is that a firewall is blocking the Network Time Protocol (UDP Port 123) between your system and the servers that NetTime is attempting to use. It's not always obvious that a firewall even exists as they generally allow regular web traffic to pass normally. If you have temporarily disabled all firewalls that you know of and continue to have this problem, then it's almost certainly a firewall that you aren't aware of. If you can run a UDP traceroute to port 123 on one of the time servers that you're using, that should give you an indication of where the firewall is located.
NetTime is failing to sync - it reports that it had 'Inconsistent responses' If there is a large time difference between the local system and the time returned by the time server, NetTime will automatically check with a secondary server to ensure that the time that it has received is actually valid. If it can't find a unique secondary server that provides a time which is a close fit to the time returned by the primary server, it will fail with 'Inconsistent Responses' The most common causes for this is if multiple servers are configured but point to the same IP address, or you're using the default servers and you are in a region with only 1 actual server in the NTP Pool. Possible solutions are to either remove all but one server address - in which case, the time returned by it will always be used - even if it's invalid, or change your servers - if you're using the NTP Pool servers, then you should point to the servers for a larger geographic area.
NetTime is syncing, but the time is out by an hour - e.g. Daylight savings time isn't be honoured correctly: NetTime works internally with UTC (Universal Time) and doesn't have any code for handling daylight savings or time zones. As long as Windows is configured correctly, it should automatically handle daylight savings changes for you. If Windows isn't handling it correctly, it most likely needs to be updated. You can also manually your time zone information using the free Microsoft tool: Windows Time Zone Editor tzedit.exe Alternatively, the Windows Server 2003 Resource Kit Tools reportedly includes a command line timezone.exe tool for advanced users.
I have configured NetTime to provide time to other systems, but it's not working: Ensure that the Windows Time Service is disabled along with any other NTP servers that may be running. Also, make sure that the Windows Firewall, and other firewalls, aren't bloicking the incoming connections to NetTime.
What does Offset mean? Offset is the time difference between the local system time and the time returned by the time server.
What does Lag mean? Lag is the amount of time that it took for the request from NetTime to go out to the server and for the response to come back. NetTime has code to try to compensate for high latency connections, but it won't work well on connections with asymmetric network delays - i.e. when the time that it takes for the request to go out is significantly different to the time for the response to come back.
Can I configure NetTime to use a proxy server? Unfortunately, the Network Time Protocol doesn't support the use of proxies, so that isn't an option and there isn't anything that I can do about this - sorry!
I have a problem not listed above: If NetTime isn't working correctly for you, please enable Debug level logging, attempt to do another time sync and then send an email to me with your log file attached along with a detailed description of the problem that you're having.
Most settings should be fairly self explanatory, however some people have asked for clarification on certain settings:
Max Free Run: Indicates how long the program will run for without getting a valid sync before it considers the local time to no longer be accurate. Once this time period expires, the tray icon will change to a cross and if it's configured to act as a time server, it will stop responding to requests for the time.
If Time adjustment greater than: The default setting for this means that the local time will be updated regardless of how much difference there is between the current local time and the time reported by the remote server. There shouldn't normally be a reason to change this as the current version of NetTime will check with multiple servers to ensure that it isn't using an invalid time.
Always provide time: Enabling this option isn't recommended. Normally, NetTime will only provide time to other systems if it is configured to do so and it has successfully synced to an upstream server. If you enable the option to always provide time, you may find that it will give out invalid time to any systems that connect to it!
If you are using NetTime to act as a time server, you will need to disable the built in Time Service in Windows first. Although the description for the Windows Time Service indicates that disabling it may prevent other services from loading, I'm not currently aware of any such services that do actually require it. If you're not using NetTime as a time server, disabling the Windows Time Service is optional, but there shouldn't be any harm in disabling it to save a bit of RAM.
If you want to preconfigure settings that are different to the defaults, they are stored in the registry under:
HKLMSoftwareSubjective SoftwareNetTime
On 64 bit systems, the above location is remapped to:
HKLMSoftwareWow6432NodeSubjective SoftwareNetTime
Version 3.20 Alpha 3:
Version 3.20 Alpha 2:
Version 3.20 Alpha 1:
Version 3.14:
Version 3.13:
Version 3.12:
Version 3.11:
Version 3.1:
Version 3.0:
Version 3.0 Release Candidate 1:
Version 3.0 Beta 4:
Version 3.0 Beta 3:
Version 3.0 Beta 2:
Version 3.0 Beta 1:
Despite the amount of work that has gone into this updated version, most of the credit for it still lies with Graham Mainwaring.
The latest version has been tested with Delphi XE2 Professional: The current version includes an older version of the Internet Component Suite which is not compatible with Unicode versions of Delphi (i.e. Delphi 2009 and newer) Upgrading to the latest version of the Internet Component Suite by François Piette will resolve the Unicode issues. When upgrading to the new version of the Internet Component Suite, you will need to change the reference to HttpProt in the uses clause of UpdateCheck.pas to read OverbyteIcsHttpProt.
Of course, as this is free software, I can't give any guarantees as to when (or even if) any feature requests will be incorporated into a future version - unless you're wanting to pay for it of course! If you have a programming project that you would like me to work on for you, you're certainly more than welcome to contact me!
SNTP clients resync the system time at regular intervals - between these time syncs, the system will be allowed to run at its normal speed which may mean that it runs either fast or slow - gradually putting the system time out until the next sync takes place. The speed at which the system time deviates from the correct time depends greatly on the system hardware and also to a certain extent what software is being run. Most PCs gain or lose a few seconds each day, however I've seen a system that loses 9 seconds per hour - more than 3.5 minutes per day!
The vast majority of users should find that NetTime more than meets their needs, however if you have specific requirements for very accurate time, I recommend that you investigate installing a full NTP client. Although you can set NetTime to sync more frequently to compensate for an inaccurate system clock, this isn't really recommended because of the greater strain that it puts onto the public NTP servers. A full NTP client has extra features to ensure better time accuracy (normally well below 10 milliseconds even between time syncs) by adjusting the rate that the system clock runs at. If you are administering a large number of PCs for an organization, it's also recommended that you configure a full NTP client on your network and have the rest of your systems sync to it with an SNTP client - this reduces the load on the public time servers even further as well as ensuring that all systems are in sync with a single time source.
Part of the apparent reason why Graham abandoned the NetTime project was because Windows 2000 and XP already include an SNTP Client and a free download was available from Microsoft for Windows NT. Graham characterized the Microsoft NTP client as being full featured, however, I strongly disagree with this - I would call the Windows SNTP client very basic - the user interface has only 2 features - allowing the SNTP server to be changed and a button to attempt an immediate sync. The Microsoft SNTP client does have more features available, but they require manual editing of the system registry - something which most users are understandably reluctant to do. In the end, even with editing the registry settings, the Microsoft client is still just an SNTP client with the limitation of being able to sync with only a single remote server.
Like the vast majority of SNTP clients that can only sync with one server, (and also most of the remainder that only have backups for if the primary server fails completely) the Microsoft SNTP client has a major problem when it receives a reply with a vastly different time to what is currently set on the system - the software simply has no way to know which is closer to being correct - either the system time could be wildly inaccurate (e.g. because the CMOS battery has failed) or the answer from the server could be wrong (either accidentally or maliciously.)
For Windows XP, in order to prevent the Microsoft SNTP client from setting the system time to a wildly incorrect value, Microsoft made the design decision that their client would only update the system time if the server response was within 15 hours of the current system time. This reduced the risk of an invalid time being set on the system (but not completely) but also has the effect that if the system time isn't at least reasonably accurate it never would be until manually fixed! For a system with a failed CMOS battery, the Microsoft SNTP client is pretty much useless.
For Windows Vista (and 7) Microsoft relaxed the rules so that (at least when manually triggering an update) the current system time being wrong doesn't prevent the SNTP client from updating the system time. This of course does mean that an incorrect response from the time server can put the system time way out. The Windows Time Service in Windows 7 is also configured by default to not start automatically each time the system is started - the user interface reports that Windows is configured to automatically update the system time, but it doesn't unless the user manually starts the Windows Time Service either through the Services Control Panel applet, or by requesting a manual sync. Unless the user reconfigures the Windows Time Service to start automatically, it will be effectively disabled every time the system is restarted!
NetTime ensures that it is not setting the system time to an incorrect value by always checking with a second server (when configured) if the time adjustment is more than 10 seconds. Short of a major bug in the program design or a very sustained attempt to maliciously skew the system time by a rogue time server, NetTime simply won't set an invalid system time!
JpegDec: Open Source Fast JPEG Decoder for Delphi
MAC times are pieces of file systemmetadata which record when certain events pertaining to a computer file occurred most recently. The events are usually described as 'modification' (the data in the file was modified), 'access' (some part of the file was read), and 'metadata change' (the file's permissions or ownership were modified), although the acronym is derived from the 'mtime', 'atime', and 'ctime' structures maintained by Unix file systems. Windows file systems do not update ctime when a file's metadata is changed[citation needed], instead using the field to record the time when a file was first created, known as 'creation time' or 'birth time'. Some other systems also record birth times for files, but there is no standard name for this metadata; ZFS, for example, stores birth time in a field called 'crtime'. MAC times are commonly used in computer forensics.[1][2] The name Mactime was originally coined by Dan Farmer, who wrote a tool with the same name.[3]
A file's modification time describes when the content of the file most recently changed. Because most file systems do not compare data written to a file with what is already there, if a program overwrites part of a file with the same data as previously existed in that location, the modification time will be updated even though the contents did not technically change.
A file's access time identifies when the file was most recently opened for reading. Access times are usually updated even if only a small portion of a large file is examined. A running program can maintain a file as 'open' for some time, so the time at which a file was opened may differ from the time data was most recently read from the file.
Because some computer configurations are much faster at reading data than at writing it, updating access times after every read operation can be very expensive. Some systems mitigate this cost by storing access times at a coarser granularity than other times; by rounding access times only to the nearest hour or day, a file which is read repeatedly in a short time frame will only need its access time updated once.[4] In Windows, this is addressed by waiting for up to an hour to flush updated access dates to the disk.[5]
Some systems also provide options to disable access time updating altogether. In Windows, starting with Vista, file access time updating is disabled by default.[6]
Unix and Windows file systems interpret 'ctime' differently:
This difference in usage can lead to incorrect presentation of time metadata when a file created on a Windows system is accessed on a Unix system and vice versa.[citation needed] Most Unix file systems don't store the creation time, although some, such as HFS+, ZFS, and UFS2 do. NTFS stores both the creation time and the change time.
The semantics of creation times is the source of some controversy.[citation needed] One view is that creation times should refer to the actual content of a file: e.g. for a digital photo the creation time would note when the photo was taken or first stored on a computer. A different approach is for creation times to stand for when the file system object itself was created, e.g. when the photo file was last restored from a backup or moved from one disk to another.
As with all file system metadata, user expectations about MAC times can be violated by programs which are not metadata-aware. Some file-copying utilities will explicitly set MAC times of the new copy to match those of the original file, while programs that simply create a new file, read the contents of the original, and write that data into the new copy, will produce new files whose times do not match those of the original.
Some programs, in an attempt to avoid losing data if a write operation is interrupted, avoid modifying existing files. Instead, the updated data is written to a new file, and the new file is moved to overwrite the original. This practice loses the original file metadata unless the program explicitly copies the metadata from the original file. Windows is not affected by this due to a workaround feature called File System Tunneling.[7]