how do I get an iso formated local date that matches my OS's one in js?

@corn flour you know...

21 Replies

venego•16mo ago

so Date().toISOString() is utc. and I'm in utc+1 I need to add an hour. how do I do so, It's fine for me to manipulate dates to get the right one for me but I don't wanna manipulate strings

cornflour•16mo ago

just as confirmation so you want the format yyyy-mm-ddThh:mm:ss in local time right?

venego•16mo ago

I actually want a space instead of T. but it's a problem. so yes. that'll work

cornflour•16mo ago

you got pretty close, just that month needs to +1 because month start at 0 and if you are not completely attached to yyyy-mm-dd, maybe look into Intl.DateTimeFormat (theres also formateToParts which can return an array of the parts of the string instead)

venego•16mo ago

I guess Intl could be my only option besides using linux posix tools I'll try Intl. the first example on my machine is not shifted by month but 2 days forwards. which is really weird.

cornflour•16mo ago

can you show me the code?

venego•16mo ago

      const date = new Date();
      const anotherDate = new Date(
        date.getFullYear(),
        date.getMonth(),
        date.getDay(),
        date.getHours(),
        date.getMinutes(),
        date.getSeconds()
      );
      console.log(anotherDate)
      // output: 3 days in the future then -1 an hour

      console.log(Intl.DateTimeFormat(undefined, {
        year: 'numeric',
        month: 'numeric',
        day: 'numeric',
        hour: 'numeric',
        minute: 'numeric',
        second: 'numeric'
      }).format(date))
      // output: accurate

      const date = new Date();
      const anotherDate = new Date(
        date.getFullYear(),
        date.getMonth(),
        date.getDay(),
        date.getHours(),
        date.getMinutes(),
        date.getSeconds()
      );
      console.log(anotherDate)
      // output: 3 days in the future then -1 an hour

      console.log(Intl.DateTimeFormat(undefined, {
        year: 'numeric',
        month: 'numeric',
        day: 'numeric',
        hour: 'numeric',
        minute: 'numeric',
        second: 'numeric'
      }).format(date))
      // output: accurate

can I get an absolute date(without the PM/AM) with Intl

venego•16mo ago

oh I can.

venego•16mo ago

worked

venego•16mo ago

I just have to deal with the weird m/d/y

cornflour•16mo ago

you can yes and the first one should be getDate, not getDay (which returns the day of the week) im not sure about the -1 hour since i cant replicate it

venego•16mo ago

unless it's behind by two months and and two days forwards???? idk, this is confusing oh getDate worked thanks. I'll stick to the first one and add an hour

cornflour•16mo ago

just out of curiosity, does this have 1 hour off to you?

  const formatDate = (d) => {
  const year = d.getFullYear()
  const month = d.getMonth() + 1
  const date = d.getDate()
  const h = d.getHours()
  const m = d.getMinutes()
  const s = d.getSeconds()
  return `${year}-${month}-${date} ${h}:${m}:${s}`
}

console.log(formatDate(new Date()))

  const formatDate = (d) => {
  const year = d.getFullYear()
  const month = d.getMonth() + 1
  const date = d.getDate()
  const h = d.getHours()
  const m = d.getMinutes()
  const s = d.getSeconds()
  return `${year}-${month}-${date} ${h}:${m}:${s}`
}

console.log(formatDate(new Date()))

venego•16mo ago

no it's accurate. hmm interesting and why the date is behind by month(before you add 1)?

cornflour•16mo ago

because getMonth returns month starting at 0 for whatever reason

venego•16mo ago

why are these two different in the hour?

      // hours in 0 utc
      const accDate = new Date(
        date.getFullYear(),
        date.getMonth(),
        date.getDate(),
        date.getHours() + 1,
        date.getMinutes(),
        date.getSeconds()
      );
 
      // hours match  local time
      const formatDate = (d) => {
        const year = d.getFullYear();
        const month = d.getMonth() + 1;
        const date = d.getDate();
        const h = d.getHours();
        const m = d.getMinutes();
        const s = d.getSeconds();
        return `${year}-${month}-${date} ${h}:${m}:${s}`;
      };

      // hours in 0 utc
      const accDate = new Date(
        date.getFullYear(),
        date.getMonth(),
        date.getDate(),
        date.getHours() + 1,
        date.getMinutes(),
        date.getSeconds()
      );
 
      // hours match  local time
      const formatDate = (d) => {
        const year = d.getFullYear();
        const month = d.getMonth() + 1;
        const date = d.getDate();
        const h = d.getHours();
        const m = d.getMinutes();
        const s = d.getSeconds();
        return `${year}-${month}-${date} ${h}:${m}:${s}`;
      };

maybe because 30 and 31 difference in months????

cornflour•16mo ago

i have no clue what you mean the new Date i created works fine with my local time

venego•16mo ago

maybe you're utc 0. I'm in +1.

cornflour•16mo ago

nah im in PST

venego•16mo ago

~~i'ts just a coincidence in your case.~~ oh??? that is weird

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how do I get an iso formated local date that matches my OS's one in js?