How I can convert any Date to Los Angeles Time (PST) and then convert this one to Unix timestamp?-CodePudding

I'm trying to convert my local date or any local date to PST and then into timestamp. For example, this code works to convert the local time to PST:

var offset = -7;
var result = new Date(new Date().getTime()   offset * 3600 * 1000)
  .toUTCString()
  .replace(/ GMT$/, "");

console.log("Result:", result);

This one return the PST corresponding time, but when I trying to apply the function getTime() (ex: result.getTime(); ) to convert this one on a Unix timestamp, I'm getting an error.

CodePudding user response：

The easiest way would be to use Luxon.

https://moment.github.io/luxon/#/?id=luxon

As easy as:

npm install luxon

And then

const { DateTime, IANAZone } = require('luxon') ;

function getEpochTimeInDesiredZone( tmStr , unit = 'ms', tzName = 'America/Los_Angeles' ) {
  const tz     = new IANAZone(tzName);
  const errMsg = unit !== 's' && unit !== 'ms'
                     ? `Invalid Unit: '${unit}': must be 's' or 'ms'`
                     : !zone.isValid
                     ? `Invalid TimeZone Name: '${tz}': must be a valid IANA time zone name`
                     : undefined
                     ;

  if (errMsg) { throw new Error(errMsg); }

  const dt = ( tmStr
               ? DateTime.fromISO( tmStr )
               : DateTime.now()
             )
             .setZone( tz )
             ;

  let epochTime = unit == 'ms' ? dt.toMillis() : dt.ToUnixSeconds() ;
  return epochTime;
}

CodePudding user response：

I found the solution:

var offset = -7;
var result = new Date(new Date().getTime()   offset * 3600 * 1000)
  .toUTCString()
  .replace(/ GMT$/, "");

var unixTimestamp = new Date(result); // Result is converted to PST time.

console.log("Result:", Math.floor( unixTimestamp.getTime() / 1000 ));