caseloha.blogg.se - Javascript convert string to date

In addition to a date and a time component, the string representation of a date and time can include an offset that indicates how much the time differs from Coordinated Universal Time (UTC). The last example using Parse demonstrates this behavior. When you use that constant, any missing year, month, or day properties are set to the value 1. You can specify the NoCurrentDateDefault constant to override these defaults. If the time is present, it must include the hour, and either the minutes or the AM/PM designator. If the date is present in the string, it must include the month and one of the day or year.

When the day of the month isn't specified, the first of the month is used.

When the year isn't specified in a date, the current year is used.

When only the date is present, the time portion is midnight.

When only the time is present, the date portion uses the current date.

Parsing methods handle this missing information by using reasonable defaults: Text representing time often does only includes hours, minutes, and an AM/PM designation. Similarly, "March 2018" represents the month of March in the year 2018.

For example, most people would assume the date "March 12" represents the current year. The text representing a date or time may be missing some information. For the IFormatProvider parameter, specify a CultureInfo object, which represents a culture, or a DateTimeFormatInfo object. If you want a specific culture or custom settings, you specify the IFormatProvider parameter of a parsing method. The CultureInfo returned by CultureInfo.CurrentCulture has a CultureInfo.DateTimeFormat property that represents the current culture. Properties of a DateTimeFormatInfo describe the date and time separators, the names of months, days, and eras, and the format for the "AM" and "PM" designations. The current DateTimeFormatInfo object provides more control over how text should be interpreted as a date and time. (See the articles on standard date and time format strings and custom date and time format strings for details.) The ParseExact and TryParseExact methods convert a string representation that conforms to the pattern specified by a date and time format string. The Parse and TryParse methods convert many common representations of a date and time. You may specify how missing components in the text representation are set in the date and time.You may specify the culture for the format of a date time.You must specify the expected format of the text representing a date and time.There are three subtasks to correctly converting text into a DateTime: The methods that convert strings to DateTime objects enable you to provide detailed information about the formats you expect and the elements of a date and time your application needs. Still others need to specify both the date and the time. Some time representations use a 24-hour clock, others specify "AM" and "PM." Some applications need only the date.

Different cultures use different orders for day, month, and year. Parsing strings to convert them to DateTime objects requires you to specify information about how the dates and times are represented as text.