CTime Class
Represents an absolute time and date.
class CTime
Members
Public Constructors
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Description |
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Constructs CTime objects in various ways. |
Public Methods
Name |
Description |
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Converts a CTime object into a formatted string — based on the local time zone. |
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Converts a CTime object into a formatted string — based on UTC. |
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Converts the time information stored in the CTime object to a Win32-compatible DBTimeStamp structure. |
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Converts the time information stored in the CTime object to a Win32-compatible SYSTEMTIME structure. |
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Creates a CTime object that represents the current time (static member function). |
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Returns the day represent by the CTime object. |
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Returns the day of the week represented by the CTime object. |
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Breaks down a CTime object into components — based on UTC. |
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Returns the hour represented by the CTime object. |
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Breaks down a CTime object into components — based on the local time zone. |
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Returns the minute represented by the CTime object. |
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Returns the month represented by the CTime object. |
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Returns the second represented by the CTime object. |
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Returns a __time64_t value for the given CTime object. |
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Returns the year represented by the CTime object. |
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Serializes data to or from an archive. |
Operators
These operators add and subtract CTimeSpan and CTime objects. |
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These operators add and subtract a CTimeSpan object to and from this CTime object. |
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The assignment operator. |
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Comparison operators. |
Remarks
CTime does not have a base class.
CTime values are based on coordinated universal time (UTC), which is equivalent to Coordinated Universal time (Greenwich Mean Time, GMT). See Time Management for information about how the time zone is determined.
When you create a CTime object, set the nDST parameter to 0 to indicate that standard time is in effect, or to a value larger than 0 to indicate that daylight saving time is in effect, or to a value less than zero to have the C run-time library code compute whether standard time or daylight saving time is in effect. tm_isdst is a required field. If not set, its value is undefined and the return value from mktime is unpredictable. If timeptr points to a tm structure returned by a previous call to asctime_s, _gmtime_s, or localtime_s, the tm_isdst field contains the correct value.
A companion class, CTimeSpan, represents a time interval.
The CTime and CTimeSpan classes are not designed for derivation. Because there are no virtual functions, the size of CTime and CTimeSpan objects is exactly 8 bytes. Most member functions are inline.
Note
The upper date limit is 12/31/3000. The lower limit is 1/1/1970 12:00:00 AM GMT.
For more information about using CTime, see the articles Date and Time, and Time Management in the Run-Time Library Reference.
Note
The CTime structure changed from MFC 7.1 to MFC 8.0. If you serialize a CTime structure by using the operator << under MFC 8.0 or a later version, the resulting file will not be readable on older versions of MFC.
Requirements
Header: atltime.h
See Also
Reference
_ftime_s, _ftime32_s, _ftime64_s
gmtime_s, _gmtime32_s, _gmtime64_s
localtime_s, _localtime32_s, _localtime64_s
strftime, wcsftime, _strftime_l, _wcsftime_l