JavaScript Manual vs DevTime

JavaScript Manual - Complete Offline Reference Your go-to companion for JavaScript development. Read everything from ES6+ basics to Web APIs anytime, anywhere - fully offline. Three core modules: - JavaScript Guide: variables, functions, closures, async/await, prototypes and modern ES6+ syntax - Built-in Objects: Array, Object, String, Number, Date, RegExp, Map, Set, Promise and more, with methods and examples - Web API: DOM, Fetch, Storage, Canvas, WebSocket and browser interfaces Why developers love it: - 100% offline - all content stored on your device - Zero ads - clean, distraction-free reading - Lightweight and fast - built for quick lookups Perfect for learning, coding reference, interview prep, and offline study. Questions or feedback? Contact: devspera@outlook.com

DevTime is the essential date converter, timestamp calculator, and time toolkit designed specifically for developers. Paste any timestamp, date string, or duration — DevTime instantly converts it across every format you work with. Whether you need a reliable unix timestamp converter, an epoch converter, or a tool to parse complex date-time strings, DevTime handles it all in real time. SMART INPUT DETECTION Type or paste anything into the date converter: • Unix seconds or milliseconds • ISO 8601 & RFC 2822 strings • Natural-language expressions (e.g., "Monday", "3 weeks") • Durations (e.g., "90 minutes") 9 LIVE RESULT CARDS • Unix Timestamp Converter: Instantly switch between seconds, milliseconds, and relative time. • Date Converter & Parsing: Convert to ISO 8601, RFC 2822, SQL, HTTP Cookie, US, EU, and custom patterns. • Date Components: View year, month, day, weekday, hour, minute, second, quarter, and week number. • Ordinal Date: ISO ordinal, day of year, and ISO week. • Julian Date: Julian Day Number (JDN). • Date Arithmetic & Calculation: Add or subtract any combination of time units with live cumulative results. • World Clock & Timezone Converter: Compare your datetime across any global timezone. • Alternate Calendars: Convert dates to Hebrew, Persian (Solar Hijri), and Islamic (Tabular) formats. • Duration Converter: Convert any duration to milliseconds, seconds, minutes, hours, days, weeks, and years. COPY & LOOP-BACK Every value has a one-tap copy button. The loop-back button sends any conversion result back into the input field so you can chain your date-time conversions without retyping. DESIGNED FOR DEVELOPERS • Monospace values for easy reading • Sleek dark interface • No account required • Core features work entirely offline • Privacy-focused: analytics are used solely to improve app stability and performance