@blueprintjs/datetime
Version:
Components for interacting with dates and times
41 lines • 1.85 kB
JavaScript
;
/*
* Copyright 2023 Palantir Technologies, Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.lookupTimezoneOffset = void 0;
var tslib_1 = require("tslib");
var date_fns_tz_1 = require("date-fns-tz");
/**
* Augment hard-coded timezone information stored in this package with its current offset relative to UTC,
* adjusted for daylight saving using the current date.
*
* @see https://github.com/marnusw/date-fns-tz#gettimezoneoffset
*/
function lookupTimezoneOffset(tz, date) {
var offsetInMs = (0, date_fns_tz_1.getTimezoneOffset)(tz.ianaCode, date);
if (isNaN(offsetInMs)) {
throw new Error("Unable to lookup offset for invalid timezone '".concat(tz.ianaCode, "'"));
}
var isPositiveOffset = offsetInMs >= 0;
var offsetInMinutes = Math.abs(offsetInMs) / 1000 / 60;
var offsetHours = Math.trunc(offsetInMinutes / 60)
.toString()
.padStart(2, "0");
var offsetMinutes = (offsetInMinutes % 60).toString().padEnd(2, "0");
return tslib_1.__assign(tslib_1.__assign({}, tz), { offset: "".concat(isPositiveOffset ? "+" : "-").concat(offsetHours, ":").concat(offsetMinutes) });
}
exports.lookupTimezoneOffset = lookupTimezoneOffset;
//# sourceMappingURL=timezoneOffsetUtils.js.map