About DateAndTimeConverter.com
What We Built
DateAndTimeConverter.com is a free, browser-based tool for converting between date and time formats. Paste any timestamp — ISO 8601, Unix epoch, US or European notation, verbose formats with AM/PM and timezone names — and the converter auto-detects the format and converts it to any of 20+ target formats. No installation, no sign-up, no limits.
For users who need to convert an entire column of dates inside a CSV file, we offer a Pro subscription that adds batch processing. Upload a CSV, select the date column, choose your source and target formats, preview the output, and download the converted file. Processing happens entirely in your browser using Web Workers, so your data never leaves your device.
Why We Built It
Anyone who works with data across different systems knows the pain of inconsistent date formats. A database export in ISO 8601, a CRM export in MM/DD/YYYY, server logs in Unix timestamps, and a spreadsheet from a European colleague in DD.MM.YYYY — all representing the same moments in time but written in incompatible ways.
Most online converters handle one date at a time and don't support batch conversion. Those that do often require uploading your file to a remote server, which is a non-starter for sensitive financial, healthcare, or customer data. We built DateAndTimeConverter.com to solve both problems: instant single-date conversion that's free forever, and batch CSV processing that keeps your data local.
How It Works
The converter is built with Astro and React, deployed on Cloudflare. The core conversion engine runs entirely in client-side JavaScript. When you paste a date, the engine tests it against 25 known format patterns to auto-detect the source format, then applies the conversion rules and timezone adjustments to produce the output.
CSV batch processing uses the same conversion engine but runs it inside a Web Worker thread. This keeps the browser UI responsive even when processing files with hundreds of thousands of rows. The file is parsed with PapaParse, each row's date column is converted, and the result is assembled into a downloadable CSV — all without any data leaving your browser.
Supported Formats
The converter handles 25 source formats and 20 target formats across several categories:
ISO 8601 & Standard
YYYY-MM-DD, YYYY-MM-DDTHH:MM:SSZ, ISO with milliseconds (.000Z), ISO without trailing Z, YYYY-MM-DD HH:MM:SS, and YYYY.MM.DD with UTC offset. These are the universal interchange formats used by APIs, databases, and logging systems.
Unix & Epoch Timestamps
10-digit second timestamps and 13-digit millisecond timestamps. Common in database exports, server logs, API responses, and analytics platforms.
US & European Dates
MM/DD/YYYY, M/D/YYYY (US), DD.MM.YYYY (European), and variants with time components. Convert freely between conventions for individual dates or entire CSV columns.
Human-Readable & Verbose
Formats like "January 15, 2025 at 3:30 PM EST", "Mon DD, YYYY, HH:MM:SS AM/PM (UTC)", and other natural-language date strings found in CRM exports, email headers, and customer-facing timestamps.
Timezone Support
The converter supports 70 timezone abbreviations spanning every major region worldwide. This includes US timezones (EST, CST, MST, PST, AKST, HST and their daylight counterparts), European timezones (GMT, BST, CET, EET, MSK), Asia-Pacific (IST, SGT, JST, AEST, NZST), and many more. Daylight saving time transitions are handled automatically using US and EU DST rules.
Privacy by Design
We made a deliberate architectural decision: all date conversion and CSV processing runs in your browser. No file is ever uploaded to our servers. No date data is ever transmitted over the network. This isn't just a privacy claim — it's how the software is built. The conversion engine is JavaScript that executes on your device, and there is no server endpoint that accepts file uploads.
This makes the tool safe for sensitive data including financial records, healthcare timestamps, customer PII, and data subject to GDPR or HIPAA requirements. For full details, see our privacy policy.
Pricing
The single-date converter is free with no limits and no sign-in required. You can convert as many individual dates as you want, in any format, with any timezone adjustment.
CSV batch processing requires a subscription at $9.99 per month. This gives you unlimited file uploads with no row limits or file size caps. Payments are processed securely by Stripe. You can cancel anytime from the Stripe customer portal — cancellation takes effect at the end of your billing period.
Technology
The site is built with Astro for fast static rendering and React for interactive components. CSV parsing is handled by PapaParse. Authentication is managed through Supabase with Google OAuth. Payments are processed by Stripe. The site is hosted on Cloudflare for global edge delivery.
Contact
Questions, feedback, or feature requests? Email us at support@dateandtimeconverter.com.