The method's single parameter is the DateTime value that represents the date and time to be converted. If the time zone supports daylight saving time, this parameter allows the method to determine the appropriate offset for that particular date and time.
However, it returns a DateTime value whose Kind property is Unspecified , as the following example illustrates. This affects DateTimeOffset values that correspond to UTC time or to the system's local time because the DateTime structure reflects only those two time zones in its Kind property.
LocalDateTime properties. UtcDateTime property. It differs from the DateTime property in two ways:. It returns a DateTime value whose Kind property is Utc. If the Offset property value does not equal TimeSpan. Zero , it converts the time to UTC. If your application requires that converted DateTime values unambiguously identify a single point in time, you should consider using the DateTimeOffset. Zero to a DateTime value. The following code uses the UtcDateTime property to perform both a time zone conversion and a type conversion on a DateTimeOffset value.
The method returns the date and time passed to it as its first parameter, but sets the Kind property to the value specified by its second parameter. The following code uses the SpecifyKind method when converting a DateTimeOffset value whose offset corresponds to that of the local time zone. You can also use the DateTimeOffset. The Kind property of the returned DateTime value is Local.
The following code uses the DateTimeOffset. LocalDateTime property when converting a DateTimeOffset value whose offset corresponds to that of the local time zone. This means that you can retrieve a value from the DateTimeOffset. Here, I set a datetime variable to the same value as the datetimeoffset variable.
This causes the value to be converted to datetime and we can then use a SELECT statement to see the value of each variable. In this case, the datetimeoffset value includes the time zone offset and 7 decimal places. Furthermore, its third fractional digit is rounded up. This is because its accuracy is always rounded to increments of. In the previous example, the datetime value was assigned by setting it to the same value as the datetimeoffset value.
If we try to assign the same value directly to the datetime variable we get an error:. This will be true even if we use the same fractional seconds precision and fractional seconds value.
In this case datetimeoffset uses a scale of 3, which gives it 3 decimal places the same as datetime. This is done using datetimeoffset 3 when declaring the variable.
Click to see full answer. The most important distinction is that DateTime does not store time zone information, while DateTimeOffset does.
Although DateTime distinguishes between UTC and Local, there is absolutely no explicit time zone offset associated with it. The DateTimeOffset structure represents a date and time value, together with an offset that indicates how much that value differs from UTC.
Thus, the value always unambiguously identifies a single point in time. DateTime itself contains no real timezone information. It may know if it's UTC or local, but not what local really means. However, that's still not really enough to determine the timezone , as many different timezones can have the same offset at any one point in time.
Both data types are used for storing date and time values. But there are significant differences between the two. Perhaps the most obvious difference is that the datetimeoffset stores the time zone offset, whereas datetime doesn't. The datetime type on the other hand, has a fixed storage size and precision. What is the correct way to write time zones?
If you need to indicate that a time is in a certain time zone, the simplest way to do it is to put the time zone abbreviation in parentheses after the time: for eastern standard time, p. How do you convert UTC time to local time? Where is UTC time zone?
0コメント