Javascript’s computed dates are relative to the time zone of the computer that is running the program. Let iso2 = new Date("11-24-2021") // Possible read, error, or NaN Time Zone Variations #Javascript setdate add days iso#Always specify ISO dates in the “YYYY-MM-DD” format. Like the previous format, some browsers will try to read it, and they might throw an error or return NaN. When specifying ISO dates, the format MM-DD-YYYY is undefined. Let short2 = new Date("4") // Possible read, error, or NaN Always specify short dates in the “MM/DD/YYYY” format. Some browsers will try to read the format, and may throw an error if they cannot, and others will return NaN (not a number). The date format “YYYY/MM/DD” (with forward-slashes as delimiter) is undefined. The following examples illustrate common problems with undefined date formats, assuming a date of November 24, 2021. Switching months, days, and years around may cause unexpected errors. Let leading3 = new Date("") // Possible day error Undefined Date FormatsĪlways specify dates with their components in the recommended order. Let leading2 = new Date("") // Possible month error These three dates should be equivalent, but are NOT. The following examples should be equivalent, but only the first one is guaranteed not to create an error. In some browsers, specifying a date without leading zeros on months or days may cause an error in the “YYYY-MM-DD” format. These special functions often include try catch statements to handle errors or invalid dates, and can be tricky to implement. When converting from Javascript to JSON and back using JSON.parse() and JSON.stringify(), for example, developers must create special functions to handle Javascript dates because the built-in functions can’t do it themselves. We’ve already covered some of the quirkiness of Javascript date formats in previous blogs. Let longDate4 = new Date("JAN 01, 2021") Quirky Behaviors of Javascript Date Format Types Let longDate3 = new Date("January 01 2021") Long dates ignore commas and are case-insensitive. #Javascript setdate add days full#You can write months’ full names or abbreviate them in long dates. However, this format may cause confusion for international audiences please see the “Quirky Behaviors of Javascript Date Format Types” section for details. The month and day can be in either of the first to positions - “MMM DD YYYY” or “DD MMM YYYY” - so both of these two formats are acceptable. Long dates use the abbreviation of a month rather than its number. However, this format may be less familiar to international audiences please see the “Quirky Behaviors of Javascript Date Format Types” section for details. Short dates are a format most Americans write every day: MM/DD/YYYY. Location-appropriate presentation to the user is as important as ensuring time issues remain consistent for all users, regardless of location. The variables dateTimeUTC and dateTimeEST refer to time zones respectively Coordinated Universal Time and Eastern Standard Time. The following examples show the different ISO date and time formats that Javascript supports. Dates With Times - YYYY-MM-DDTHH:MM:SSZ.The preferred Javascript date formats are: -HH:MM - replaces “Z” if offsetting UTC to another time zone earlier than UTC.+HH:MM - replaces “Z” if offsetting UTC to another time zone later than UTC.Z - indicates Coordinated Universal Time (UTC).T - separation character between date and time.The ISO 8601 standard defines the parts of times as follows: DD - day from 01 to last day of the month (various).The ISO 8601 standard defines the parts of dates as follows: Javascript uses this by default because it is a well-defined, precise, and consistent standard. ISO dates use the ISO 8601 standard to specify dates and times in a variety of ways. By default, Javascript uses ISO dates internally. The three Javascript date format types are ISO ( International Organization for Standardization) dates, short dates, and long dates. Then, we will examine the quirks that browsers present when working with these formats. This article will go over the various types of Javascript date formats and why Javascript has a preferred format for both dates and times. This is less of a problem in modern browsers but some irregularities still remain. #Javascript setdate add days code#Developers need to be aware that the same code handling a date can work differently on different browsers. Some variations in Javascript dates happen simply because of the browser you use, especially when adding a specific time. The Javascript standard provides three different formats for Javascript dates, and each format has different uses. Javascript date formats are notoriously quirky - they are a critical part of many websites, but they’re difficult to implement correctly in a cross-browser fashion - and have caused developers many headaches.
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