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std.time: more precise nanoTimestamp in windows

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This commit is contained in:
Ali Cheraghi
2025-02-12 17:56:37 +03:30
committed by Alex Rønne Petersen
parent d12123a88c
commit bffbc918ee
4 changed files with 7 additions and 28 deletions
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lib/std/time.zig
+2 -5
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@@ -47,13 +47,10 @@ pub fn microTimestamp() i64 {
pub fn nanoTimestamp() i128 {
switch (builtin.os.tag) {
.windows => {
// FileTime has a granularity of 100 nanoseconds and uses the NTFS/Windows epoch,
// RtlGetSystemTimePrecise() has a granularity of 100 nanoseconds and uses the NTFS/Windows epoch,
// which is 1601-01-01.
const epoch_adj = epoch.windows * (ns_per_s / 100);
var ft: windows.FILETIME = undefined;
windows.kernel32.GetSystemTimeAsFileTime(&ft);
const ft64 = (@as(u64, ft.dwHighDateTime) << 32) | ft.dwLowDateTime;
return @as(i128, @as(i64, @bitCast(ft64)) + epoch_adj) * 100;
return @as(i128, windows.ntdll.RtlGetSystemTimePrecise() + epoch_adj) * 100;
},
.wasi => {
var ns: std.os.wasi.timestamp_t = undefined;