However, it turns out there is a "patched" way to achieve nanosecond precision on Windows 7—without requiring a service pack update. It involves digging into the undocumented side of the Windows kernel.
This feature introduces a patched version of the GetSystemTimePreciseAsFileTime function on Windows 7, allowing for high-precision timestamping.
For software targeting Windows 7:
Solving the "GetSystemTimePreciseAsFileTime" Error on Windows 7: Patched Solutions and Workarounds
Even if an application's primary code does not utilize high-precision timestamps, modern compilers introduce the dependency automatically. getsystemtimepreciseasfiletime windows 7 patched
, which has a resolution of ~15.6ms, the "Precise" version combines system time with the performance counter to achieve sub-microsecond accuracy. Microsoft Learn Potential Solutions
Some developers release "legacy" or "community patched" versions of their software to maintain Windows 7 compatibility: GetSystemTimePreciseAsFileTime error on Windows 7 #101 However, it turns out there is a "patched"
: It retrieves the current system date and time with the highest possible level of precision (
Inside the kernel, Windows maintains the current time as a combination of a base time (updated periodically) and a tick count derived from the TSC (Time Stamp Counter) or HPET. if (g_NtQuerySystemTime(&li) == 0) // STATUS_SUCCESS
LARGE_INTEGER li; if (g_NtQuerySystemTime(&li) == 0) // STATUS_SUCCESS