44 lines
1.6 KiB
JavaScript
44 lines
1.6 KiB
JavaScript
import { config } from 'dotenv'
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import { resolve, dirname } from 'path'
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import { fileURLToPath } from 'url'
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const ROOT = resolve(dirname(fileURLToPath(import.meta.url)), '../..')
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export function cfg() {
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config({ path: resolve(ROOT, '.env'), override: true })
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config({ path: resolve(ROOT, '.env.local'), override: true })
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return {
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PORT: process.env.PORT || 3000,
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ADSB_URL: process.env.ADSB_URL || '',
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DB_HOST: process.env.DB_HOST || 'http://localhost:8428',
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LATITUDE: parseFloat(process.env.LATITUDE || '0'),
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LONGITUDE: parseFloat(process.env.LONGITUDE || '0'),
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ALTITUDE: parseFloat(process.env.ALTITUDE || '0'),
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TZ: process.env.TZ || 'UTC',
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}
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}
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// Returns the UTC offset in minutes for the configured TZ at a given date
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export function tzOffsetMinutes(date = new Date()) {
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const tz = cfg().TZ
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// Format the date in the target timezone and compare to UTC
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const local = new Date(date.toLocaleString('en-US', { timeZone: tz }))
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const utc = new Date(date.toLocaleString('en-US', { timeZone: 'UTC' }))
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return Math.round((local - utc) / 60_000)
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}
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// Shift a UTC date to local-time-as-if-UTC (for day bucketing)
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export function toLocalMidnight(date = new Date()) {
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const offset = tzOffsetMinutes(date)
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const local = new Date(date.getTime() + offset * 60_000)
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local.setUTCHours(0, 0, 0, 0)
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return local
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}
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// Get YYYY-MM-DD string in local timezone
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export function localDateStr(date = new Date()) {
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const offset = tzOffsetMinutes(date)
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const shifted = new Date(date.getTime() + offset * 60_000)
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return shifted.toISOString().slice(0, 10)
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}
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