I have date with format '2021-05-01T23:59:59.999-05:00'
Need to fetch utc offset value like 300, 330 etc.
Can someone help here.Any Answer without using moment.js is appreciated.
So extracting value -05:00 from '2021-05-01T23:59:59.999-05:00'
The function Date.getTimezoneOffset() will only ever give you the offset between the client machine timezone and UTC, it won't give you the UTC offset as specified in the ISO date string.
Given that the dates are in ISO-8601 format, we can parse the UTC offset from the data, it will be in the format ±[hh]:[mm], ±[hh][mm], ±[hh] or 'Z' for UTC / Zulu time.
Negative UTC offsets describe a time zone west of UTC±00:00, where the civil time is behind (or earlier) than UTC so the zone designator will look like "−03:00","−0300", or "−03".
Positive UTC offsets describe a time zone at or east of UTC±00:00, where the civil time is the same as or ahead (or later) than UTC so the zone designator will look like "+02:00","+0200", or "+02".
We'll use regular expressions to parse the timezone offsets, this will work on IE 11 too.
function getUTCOffsetMinutes(isoDate) {
// The pattern will be ±[hh]:[mm], ±[hh][mm], or ±[hh], or 'Z'
const offsetPattern = /([+-]\d{2}|Z):?(\d{2})?\s*$/;
if (!offsetPattern.test(isoDate)) {
throw new Error("Cannot parse UTC offset.")
}
const result = offsetPattern.exec(isoDate);
return (+result[1] || 0) * 60 + (+result[2] || 0);
}
const inputs = [
'2021-05-01T23:59:59.999+12:00',
'2021-05-01T23:59:59.999+10',
'2021-05-01T23:59:59.999+0530',
'2021-05-01T23:59:59.999+0300',
'2021-05-01T23:59:59.999Z',
'2021-05-01T23:59:59.999-05:00',
'2021-05-01T23:59:59.999-07:00',
];
for(var i = 0; i < inputs.length; i++) {
console.log('input:', inputs[i], 'offsetMinutes:', getUTCOffsetMinutes(inputs[i]));
}Pretty much the same as @TerryLennox but deals with:
function parseOffset(ts) {
let [all,hr,min,sec] = (''+ts).match(/([+-]\d{2}|Z):?(\d{2})?:?(\d{2})?$/) || [];
let sign = hr < 0 ? -1 : 1;
return !all ? all : // No match, return undefined
hr == 'Z' ? 0 :
hr * 60 + (min? sign * min : 0) + (sec? sign * sec / 60 : 0);
}
['2021-05-01T23:59:59.999-05:30',
'2021-05-01T23:59:59.999+05:30',
'2021-05-01T23:59:59.999-0530',
'2021-05-01T23:59:59.999+0530',
'2021-05-01T23:59:59.999-05',
'2021-05-01T23:59:59.999+05',
'2021-05-01T23:59:59.999+053012',
'2021-05-01T23:59:59.999+05:30:12',
'2021-05-01T23:59:59.999Z',
'2021-05-01T23:59:59.999',
'blah'
].forEach(ts => console.log(ts + ' -> ' + parseOffset(ts)));