The system can periodically refresh the time by synchronizing with a time source. Use normal 64-bit arithmetic on the ULARGE_INTEGER value.SYSTEMTIME structure to obtain relative times. It is not recommended that you add and subtract values from the See leap day readiness for more information. When working with this API, you should ensure its validity, especially in leap year scenarios. The SYSTEMTIME does not check to see if the date represented is a real and valid date. The valid values for this member are 0 through 999. The valid values for this member are 0 through 59. The valid values for this member are 0 through 23. The valid values for this member are 1 through 31. This member can be one of the following values. The valid values for this member are 1601 through 30827. Syntax typedef struct _SYSTEMTIME SYSTEMTIME, *PSYSTEMTIME, *LPSYSTEMTIME The time is either in coordinated universal time (UTC) or local time, depending on the function that is being called. The unbiased interrupt-time count does not include time the system spends in sleep or hibernation.Specifies a date and time, using individual members for the month, day, year, weekday, hour, minute, second, and millisecond. Gets the current unbiased interrupt-time count, in a more precise form than QueryUnbiasedInterruptTime does. The unbiased interrupt-time count does not include time the system spends in sleep or hibernation. Gets the current unbiased interrupt-time count. Gets the current interrupt-time count, in a more precise form than QueryInterruptTime does. The following function is used with interrupt time. FunctionĬonvertAuxiliar圜ounterToPerformanceCounterĬonverts the specified auxiliary counter value to the corresponding performance counter value optionally provides the estimated conversion error in nanoseconds due to latencies and maximum possible drift.ĬonvertPerformanceCounterToAuxiliar圜ounterĬonverts the specified performance counter value to the corresponding auxiliary counter value optionally provides the estimated conversion error in nanoseconds due to latencies and maximum possible drift. The following functions are used with the auxiliary performance counter. Retrieves the frequency of the high-resolution performance counter. Retrieves the current value of the high-resolution performance counter. The following functions are used with high-resolution performance counters. Retrieves the number of milliseconds that have elapsed since the system was started. Retrieves the number of milliseconds that have elapsed since the system was started, up to 49.7 days. The following functions are used with Windows time. FunctionĬonverts MS-DOS date and time values to a file time.Ĭonverts a file time to MS-DOS date and time values. The following functions are used with MS-DOS date and time. Sets the date and time that the specified file or directory was created, last accessed, or last modified. Retrieves the date and time that the specified file or directory was created, last accessed, and last modified.Ĭonverts a local file time to a file time based on UTC. FunctionĬonverts a file time to system time format. The following functions are used with file time. Sets the current time zone and dynamic daylight saving time settings.Ĭonverts a UTC time with dynamic daylight saving time settings to a specified time zone's corresponding local time.Ĭonverts a local time with dynamic daylight saving time settings to UTC time. Retrieves the time zone settings for the specified year and time zone. Retrieves the current time zone settings. Retrieves the current local date and time. Retrieves a range, expressed in years, for which a DYNAMIC_TIME_ZONE_INFORMATION has valid entries. GetDynamicTimeZoneInformationEffectiveYears Retrieves the current time zone and dynamic daylight saving time settings. FunctionĮnumerates dynamic daylight saving time information entries stored in the registry.Ĭonverts a UTC file time to a local file time. The following functions are used with local time. Retrieves the current system date and time in UTC format.ĭetermines whether the system is applying periodic time adjustments to its time-of-day clock.įormats a system time as a time string for a specified locale.Ĭonverts the specified local time to system time.Ĭonverts the specified system time to the number of seconds since the first second of January 1, 1970.Įnables or disables periodic time adjustments to the system's time-of-day clock.Ĭonverts a UTC time to a specified time zone's corresponding local time. The following functions are used with system time.
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