| 1 | /** |
| 2 | * Time utilities for handling user-local time conversion. |
| 3 | */ |
| 4 | |
| 5 | const TIME_FORMAT_12H = "12h"; |
| 6 | const TIME_FORMAT_24H = "24h"; |
| 7 | |
| 8 | /** |
| 9 | * Convert an ISO string to a local time string |
| 10 | * @param {string} utcIsoString - ISO time string |
| 11 | * @param {Object} options - Formatting options for Intl.DateTimeFormat |
| 12 | * @returns {string} Formatted local time string |
| 13 | */ |
| 14 | export function toLocalTime(utcIsoString, options = {}) { |
| 15 | if (!utcIsoString) return ''; |
| 16 | |
| 17 | const date = utcIsoString instanceof Date ? utcIsoString : new Date(utcIsoString); |
| 18 | const defaultOptions = { |
| 19 | dateStyle: 'medium', |
| 20 | timeStyle: 'medium', |
| 21 | timeZone: getUserTimezone(), |
| 22 | }; |
| 23 | |
| 24 | return new Intl.DateTimeFormat( |
| 25 | undefined, // Use browser's locale |
| 26 | withUserTimeFormatOptions({ ...defaultOptions, ...options }) |
| 27 | ).format(date); |
| 28 | } |
| 29 | |
| 30 | /** |
| 31 | * Convert a Date object to a UTC ISO string. |
| 32 | * @param {Date} date - Date object in local time |
| 33 | * @returns {string} UTC ISO string |
| 34 | */ |
| 35 | export function toUTCISOString(date) { |
| 36 | if (!date) return ''; |
| 37 | return date.toISOString(); |
| 38 | } |
| 39 | |
| 40 | /** |
| 41 | * Get current time as a UTC ISO string. |
| 42 | * @returns {string} Current UTC time in ISO format |
| 43 | */ |
| 44 | export function getCurrentUTCISOString() { |
| 45 | return new Date().toISOString(); |
| 46 | } |
| 47 | |
| 48 | function padNumber(value, width = 2) { |
| 49 | return String(value).padStart(width, "0"); |
| 50 | } |
| 51 | |
| 52 | function getTimeZoneParts(date, timeZone) { |
| 53 | const formatter = new Intl.DateTimeFormat("en-US", { |
| 54 | timeZone, |
| 55 | year: "numeric", |
| 56 | month: "2-digit", |
| 57 | day: "2-digit", |
| 58 | hour: "2-digit", |
| 59 | minute: "2-digit", |
| 60 | second: "2-digit", |
| 61 | hourCycle: "h23", |
| 62 | }); |
| 63 | const parts = Object.fromEntries( |
| 64 | formatter.formatToParts(date) |
| 65 | .filter((part) => part.type !== "literal") |
| 66 | .map((part) => [part.type, part.value]) |
| 67 | ); |
| 68 | return { |
| 69 | year: Number(parts.year), |
| 70 | month: Number(parts.month), |
| 71 | day: Number(parts.day), |
| 72 | hour: Number(parts.hour), |
| 73 | minute: Number(parts.minute), |
| 74 | second: Number(parts.second), |
| 75 | millisecond: date.getMilliseconds(), |
| 76 | }; |
| 77 | } |
| 78 | |
| 79 | export function getUserDateTimeParts(date = new Date()) { |
| 80 | return getTimeZoneParts(date, getUserTimezone()); |
| 81 | } |
| 82 | |
| 83 | function getTimeZoneOffsetMinutes(date, timeZone, parts = getTimeZoneParts(date, timeZone)) { |
| 84 | const asUtc = Date.UTC( |
| 85 | parts.year, |
| 86 | parts.month - 1, |
| 87 | parts.day, |
| 88 | parts.hour, |
| 89 | parts.minute, |
| 90 | parts.second, |
| 91 | parts.millisecond, |
| 92 | ); |
| 93 | return Math.round((asUtc - date.getTime()) / 60_000); |
| 94 | } |
| 95 | |
| 96 | function formatOffset(offsetMinutes) { |
| 97 | const sign = offsetMinutes >= 0 ? "+" : "-"; |
| 98 | const absOffset = Math.abs(offsetMinutes); |
| 99 | return `${sign}${padNumber(Math.floor(absOffset / 60))}:${padNumber(absOffset % 60)}`; |
| 100 | } |
| 101 | |
| 102 | function formatPartsAsIso(parts, offsetMinutes) { |
| 103 | return [ |
| 104 | parts.year, |
| 105 | "-", |
| 106 | padNumber(parts.month), |
| 107 | "-", |
| 108 | padNumber(parts.day), |
| 109 | "T", |
| 110 | padNumber(parts.hour), |
| 111 | ":", |
| 112 | padNumber(parts.minute), |
| 113 | ":", |
| 114 | padNumber(parts.second), |
| 115 | ".", |
| 116 | padNumber(parts.millisecond, 3), |
| 117 | formatOffset(offsetMinutes), |
| 118 | ].join(""); |
| 119 | } |
| 120 | |
| 121 | function getLocalDateParts(date) { |
| 122 | return { |
| 123 | year: date.getFullYear(), |
| 124 | month: date.getMonth() + 1, |
| 125 | day: date.getDate(), |
| 126 | hour: date.getHours(), |
| 127 | minute: date.getMinutes(), |
| 128 | second: date.getSeconds(), |
| 129 | millisecond: date.getMilliseconds(), |
| 130 | }; |
| 131 | } |
| 132 | |
| 133 | function getWallClockOffsetMinutes(parts, timeZone) { |
| 134 | const wallClockUtc = Date.UTC( |
| 135 | parts.year, |
| 136 | parts.month - 1, |
| 137 | parts.day, |
| 138 | parts.hour, |
| 139 | parts.minute, |
| 140 | parts.second, |
| 141 | parts.millisecond, |
| 142 | ); |
| 143 | let offsetMinutes = getTimeZoneOffsetMinutes(new Date(wallClockUtc), timeZone); |
| 144 | for (let attempt = 0; attempt < 3; attempt += 1) { |
| 145 | const instant = new Date(wallClockUtc - offsetMinutes * 60_000); |
| 146 | const nextOffset = getTimeZoneOffsetMinutes(instant, timeZone); |
| 147 | if (nextOffset === offsetMinutes) return offsetMinutes; |
| 148 | offsetMinutes = nextOffset; |
| 149 | } |
| 150 | return offsetMinutes; |
| 151 | } |
| 152 | |
| 153 | /** |
| 154 | * Convert a Date object to an ISO string with the user's local UTC offset. |
| 155 | * @param {Date} date - Date object in local time |
| 156 | * @returns {string} Local ISO string, e.g. 2026-05-03T10:15:30.000+02:00 |
| 157 | */ |
| 158 | export function toUserISOString(date = new Date()) { |
| 159 | if (!date) return ""; |
| 160 | const timeZone = getUserTimezone(); |
| 161 | const parts = getTimeZoneParts(date, timeZone); |
| 162 | const offsetMinutes = getTimeZoneOffsetMinutes(date, timeZone, parts); |
| 163 | return formatPartsAsIso(parts, offsetMinutes); |
| 164 | } |
| 165 | |
| 166 | /** |
| 167 | * Interpret a browser-local Date's visible wall-clock fields in the configured user timezone. |
| 168 | * Use this for date/time picker values where the selected calendar fields matter more than |
| 169 | * the browser's local instant. |
| 170 | * @param {Date} date - Date object whose local fields came from user input |
| 171 | * @returns {string} User-timezone ISO string preserving the selected wall-clock fields |
| 172 | */ |
| 173 | export function toUserWallClockISOString(date = new Date()) { |
| 174 | if (!date) return ""; |
| 175 | const timeZone = getUserTimezone(); |
| 176 | const parts = getLocalDateParts(date); |
| 177 | const offsetMinutes = getWallClockOffsetMinutes(parts, timeZone); |
| 178 | return formatPartsAsIso(parts, offsetMinutes); |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * Get current time as an ISO string with the user's local UTC offset. |
| 183 | * @returns {string} |
| 184 | */ |
| 185 | export function getCurrentUserISOString() { |
| 186 | return toUserISOString(new Date()); |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * Get current user-local calendar date as YYYY-MM-DD. |
| 191 | * @returns {string} |
| 192 | */ |
| 193 | export function getCurrentUserDateString() { |
| 194 | const now = new Date(); |
| 195 | const parts = getTimeZoneParts(now, getUserTimezone()); |
| 196 | return [ |
| 197 | parts.year, |
| 198 | padNumber(parts.month), |
| 199 | padNumber(parts.day), |
| 200 | ].join("-"); |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * Format an ISO string for display in local time with configurable format |
| 205 | * @param {string} utcIsoString - ISO time string |
| 206 | * @param {string} format - Format type ('full', 'date', 'time', 'short') |
| 207 | * @returns {string} Formatted local time string |
| 208 | */ |
| 209 | export function formatDateTime(utcIsoString, format = 'full') { |
| 210 | if (!utcIsoString) return ''; |
| 211 | |
| 212 | const date = new Date(utcIsoString); |
| 213 | if (Number.isNaN(date.getTime())) return String(utcIsoString); |
| 214 | |
| 215 | const formatOptions = { |
| 216 | full: { dateStyle: 'medium', timeStyle: 'medium' }, |
| 217 | date: { dateStyle: 'medium' }, |
| 218 | time: { timeStyle: 'medium' }, |
| 219 | short: { dateStyle: 'short', timeStyle: 'short' } |
| 220 | }; |
| 221 | |
| 222 | return toLocalTime(date, formatOptions[format] || formatOptions.full); |
| 223 | } |
| 224 | |
| 225 | /** |
| 226 | * Get the user's local timezone name |
| 227 | * @returns {string} Timezone name (e.g., 'America/New_York') |
| 228 | */ |
| 229 | export function getUserTimezone() { |
| 230 | const configured = String(globalThis.runtimeInfo?.timezone || "").trim(); |
| 231 | if (configured && configured !== "auto") return configured; |
| 232 | return getBrowserTimezone(); |
| 233 | } |
| 234 | |
| 235 | export function getBrowserTimezone() { |
| 236 | return Intl.DateTimeFormat().resolvedOptions().timeZone || "UTC"; |
| 237 | } |
| 238 | |
| 239 | export function setConfiguredTimezone(timezone) { |
| 240 | globalThis.runtimeInfo = { |
| 241 | ...(globalThis.runtimeInfo || {}), |
| 242 | timezone: String(timezone || "auto").trim() || "auto", |
| 243 | }; |
| 244 | } |
| 245 | |
| 246 | function normalizeTimeFormat(timeFormat) { |
| 247 | return String(timeFormat || "") |
| 248 | .trim() |
| 249 | .toLowerCase() === TIME_FORMAT_24H |
| 250 | ? TIME_FORMAT_24H |
| 251 | : TIME_FORMAT_12H; |
| 252 | } |
| 253 | |
| 254 | /** |
| 255 | * Get the preferred clock display format. |
| 256 | * @returns {"12h" | "24h"} |
| 257 | */ |
| 258 | export function getUserTimeFormat() { |
| 259 | return normalizeTimeFormat( |
| 260 | globalThis.runtimeInfo?.timeFormat || globalThis.runtimeInfo?.time_format |
| 261 | ); |
| 262 | } |
| 263 | |
| 264 | /** |
| 265 | * Return whether user-facing times should use AM/PM. |
| 266 | * @returns {boolean} |
| 267 | */ |
| 268 | export function getUserHour12() { |
| 269 | return getUserTimeFormat() === TIME_FORMAT_12H; |
| 270 | } |
| 271 | |
| 272 | export function setConfiguredTimeFormat(timeFormat) { |
| 273 | globalThis.runtimeInfo = { |
| 274 | ...(globalThis.runtimeInfo || {}), |
| 275 | timeFormat: normalizeTimeFormat(timeFormat), |
| 276 | }; |
| 277 | } |
| 278 | |
| 279 | export function withUserTimeFormatOptions(options = {}) { |
| 280 | const formatted = { ...options }; |
| 281 | if ( |
| 282 | formatted.timeStyle || |
| 283 | formatted.hour || |
| 284 | formatted.minute || |
| 285 | formatted.second |
| 286 | ) { |
| 287 | formatted.hour12 = getUserHour12(); |
| 288 | } |
| 289 | return formatted; |
| 290 | } |
| 291 | |
| 292 | /** |
| 293 | * Format a duration in milliseconds to a human-readable string |
| 294 | * @param {number} durationMs - Duration in milliseconds |
| 295 | * @returns {string} Formatted duration (e.g., '45s', '2m30s', '1h3m2s') |
| 296 | */ |
| 297 | export function formatDuration(durationMs) { |
| 298 | if (durationMs == null || durationMs < 0) return '0s'; |
| 299 | |
| 300 | // Round total seconds first to avoid "1m60s" when seconds round up to 60 |
| 301 | const totalSecs = Math.round(durationMs / 1000); |
| 302 | |
| 303 | if (totalSecs < 60) { |
| 304 | return `${totalSecs}s`; |
| 305 | } |
| 306 | |
| 307 | const hours = Math.floor(totalSecs / 3600); |
| 308 | const mins = Math.floor((totalSecs % 3600) / 60); |
| 309 | const secs = totalSecs % 60; |
| 310 | return hours ? `${hours}h${mins}m${secs}s` : `${mins}m${secs}s`; |
| 311 | } |