Source code of Windows XP (NT5)
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// timemath.h---written by Bill Griffin (Billgr)
#if !defined(_TIMEMATH_H_)
#define _TIMEMATH_H_
const __int64 hnsPerMillisecond = 10000i64;const __int64 hnsPerSecond = 10000000i64;const __int64 hnsPerMinute = 600000000i64;const __int64 hnsPerHour = 36000000000i64;const __int64 hnsPerDay = 864000000000i64;
inline __int64 MsFromHns(__int64 hns) { return hns / hnsPerMillisecond; }inline __int64 SecFromHns(__int64 hns) { return hns / hnsPerSecond; }inline __int64 MinFromHns(__int64 hns) { return hns / hnsPerMinute; }inline __int64 HrFromHns(__int64 hns) { return hns / hnsPerHour; }inline __int64 DayFromHns(__int64 hns) { return hns / hnsPerDay; }
inline __int64 HnsFromMs(__int64 ms) { return ms * hnsPerMillisecond; }inline __int64 HnsFromSec(__int64 sec) { return sec * hnsPerSecond; }inline __int64 HnsFromMin(__int64 min) { return min * hnsPerMinute; }inline __int64 HnsFromHr(__int64 hr) { return hr * hnsPerHour; }inline __int64 HnsFromDay(__int64 day) { return day * hnsPerDay; }
inline __int64 HnsFromFt(FILETIME ft) { return *((__int64*)&ft); }inline __int64 HnsFromFtSpan(FILETIME ftStart, FILETIME ftEnd) { return HnsFromFt(ftEnd) - HnsFromFt(ftStart); }inline __int64 SecFromFtSpan(FILETIME ftStart, FILETIME ftEnd) { return SecFromHns(HnsFromFtSpan(ftStart, ftEnd)); }inline __int64 MinFromFtSpan(FILETIME ftStart, FILETIME ftEnd) { return MinFromHns(HnsFromFtSpan(ftStart, ftEnd)); }inline __int64 HrFromFtSpan(FILETIME ftStart, FILETIME ftEnd) { return HrFromHns(HnsFromFtSpan(ftStart, ftEnd)); }inline __int64 DayFromFtSpan(FILETIME ftStart, FILETIME ftEnd) { return DayFromHns(HnsFromFtSpan(ftStart, ftEnd)); }
#endif // !defined(_TIMEMATH_H_)
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