17 lines
467 B
TypeScript
17 lines
467 B
TypeScript
|
export const determineTZ = (tz: string): string => {
|
||
|
|
tz = tz.toUpperCase();
|
||
|
|
|
||
|
|
if (tz === "ET" || tz === "CT" || tz === "MT" || tz === "PT") {
|
||
|
|
const today = new Date();
|
||
|
|
const jan = new Date(today.getFullYear(), 0, 1);
|
||
|
|
const jul = new Date(today.getFullYear(), 6, 1);
|
||
|
|
if (today.getTimezoneOffset() < Math.max(jan.getTimezoneOffset(), jul.getTimezoneOffset())) {
|
||
|
|
tz = `${tz.substr(0, 1)}DT`;
|
||
|
|
} else {
|
||
|
|
tz = `${tz.substr(0, 1)}ST`;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return tz;
|
||
|
|
};
|