1/25/2024 0 Comments Javascript setdate add hoursThen, as I drag each range input around, we can see how it affects the. This.formattedDate = ( result, this.dateMask ) Īs you can see, in my ngDoCheck() life-cycle method, I'm just taking all of the current deltas and I'm applying them to the base-date, which is whatever time it was when the demo is loaded. Result = ( "millisecond", this.millisecondDelta, result ) Result = ( "second", condDelta, result ) Result = ( "minute", this.minuteDelta, result ) Result = ( "hour", this.hourDelta, result ) Result = ( "day", this.dayDelta, result ) Result = ( "month", this.monthDelta, result ) Result = ( "year", this.yearDelta, result ) add() function returns a NEW date each time, so we have to keep saving that a new digest will be triggered on every (input) event. date-delta is adjusted, we're just going to hook into the digest since we know NOTE: Rather than have an explicit function that has to get called every time a This.dateMask = "yyyy-MM-dd HH:mm:ss.SSS" But, unlike the native JavaScript behavior, I'm going to make a copy of the original Date so that we don't mutate the input: The "part" denotes which "field" within the input Date is going to be used, and then applies the relevant. add( part: string, delta: number: input: Date ) : Date To wrap this date add/subtract up, I've crated a DateHelper class that exposes an. Well, we can do the same thing in Angular. Of course, as I said above, other languages make this behavior a bit more palatable with some sort of dateAdd() function. tMilliseconds( date.getMilliseconds() + delta ). ![]() tFullYear( date.getFullYear() + delta ). ![]() This same approach works for all of the Date parts: Meaning, by setting the hours to +48 on this JavaScript Date, we're actually adding 2-days. However, we can add and subtract more than 24-hours and the "overflow" will automatically get distributed to the rest of the date. and, to subtract time, it's the same exactly thing: Meaning, we can reproduce the above 48-hour example in JavaScript using. As I demonstrated a few years ago, when you add relative values to a Date, all date fields are updated. In JavaScript, this functionality is manifest in the Date object's native " overflow behavior". JavaScript has the same exact functionality only, it's not presented quite as cleanly as it is in some other languages. So, I can easily subtract 48-hours from a given date with the same function: These types of functions work just as well negative deltas. For example, in the Lucee CFML / ColdFusion world, I can easily add 48-hours to a given date with the dateAdd() function: ![]() I'm sure that all server-side languages have ways to add and remove time from a given date. View this code in my JavaScript Demos project on GitHub. Run this demo in my JavaScript Demos project on GitHub.
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