![]() Instead, we have to rely on an elaborate handcrafted piece of code to do it for us, which is pretty much what MomentJS did all this time, but if you don't need to make relative calendar days of week, then not having this snippet in your deployed Javascript can save a lot of space. There is no format code for printing this sort of date unit. Notice how it reads Last Friday not simply Friday. The tricky part to calculate is the relative calendar day of week. We have already seen how to format date and time unit with strftime-like format codes, and if you don't remember what those are, now's a good time to consult your nearest man 3 strftime manpage for a list of them all. More information about Date and DateTimeFormat at the provided MDN documentation.ĭepending on the day of week and time of day, it will print something like Last Friday at 9:35 PM. What I'm trying to say is, you can make a Date object with just month and year, without any day or finer grained time value, but you can't make a Date object giving it only a month without a year. It could be as simple as Date() to give it the current date, or you can specify the year, month, day, hours and others in the Date() constructor to pass it numbers for specific time units, left-most time unts being mandatory while right-most time units are optional. ![]() To get a date/time string out of DateTimeFormat you must call its date() method and pass it a Date object. It is cleaner than sprinkling %A, %h and such all over the string, we now deal precisely with objects. So when you create a DateTimeFormat object you are not creating the actual date/time string but rather an object with fillers in them that's suitable for substituting them for a Date object. If it saves code size, then this trade-off is all the better. While Moment lets you make an arbitrary-looking string that you can plug date and time format units in, Intl.DateTimeFormat is more rigid and only lets you make date and time notations that are actually in circulation. The first argument is a two-character locale that's used for making a language and country specific date string. Enter fullscreen mode Exit fullscreen modeĪnd then you pass this object as the second argument to the Intl.DateTimeFormat() constructor.
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