I am trying to deal with time expressed as 2022-07-15 06:30 LT (UTC +5.5) I can work with all the whole number UTC but I haven't found a way to deal with the 0.5
const date1 = " 2022-07-15 06:30 LT (UTC +5.5)";
utcDrop = date1.trim().split("(UTC ")[1].split(")")[0]*1;
str1 = date1.trim().split(" ")[0];
str2 = date1.trim().split(" ")[1];
date3 = str1 + "T" + str2;
const date = new Date(date3)
numOfHours = date1.split("UTC ")[1].split(")")[0]*1;
function subtractHours(numOfHours, date = new Date()) {
date.setHours(date.getHours() - numOfHours);
return date;
}
d=subtractHours(numOfHours, date);
last_port_atd = d.toISOString().slice(0, 10) + ' ' + d.toTimeString().slice(0, 5);
'2022-07-15 00:30' which is wrong because I do not know the correct statement.
No idea which methods are generally employed for the task, here's a break-down of how I'd go about it.
I would simply try the parseFloat method on the part of the string I believe to contain the number of interest. I'd use some string searching to locate this number of interest.
let haystack = '2022-07-15 06:30 LT (UTC -5.5)';
let needle = "UTC";
// set numPos to the index of the char between "UTC" and "-5.5" (a space)
let numPos = haystack.indexOf(needle) + needle.length;
// extract all chars from this point until the end of the string
let numStr = haystack.substr(numPos);
// use parseFloat, so we can capture both positive & negative offsets of non-integer amounts
let offset = parseFloat(numStr);
console.log(offset);