Is 1700000000 in the past or future? Is it seconds or milliseconds? Time-related bugs are notoriously hard to debug because timestamps look like meaningless numbers. A reliable timestamp converter is essential for every developer working with dates, scheduling, or logging.
What Is Timestamp Converter?
A Unix timestamp represents seconds (or milliseconds) since January 1, 1970 UTC (the Unix epoch). Our Timestamp Converter converts between timestamps and readable dates, supports multiple time zones, and handles both seconds and milliseconds.
How to Use Timestamp Converter on DevToolHub
- Open the Timestamp Converter tool on DevToolHub — no signup required.
- Paste or enter your input data in the left panel.
- See the result instantly in the output panel.
- Copy the result or download it as a file.
Timestamp Formats
Understanding the different timestamp representations:
// Unix timestamp (seconds)
1700000000 → November 14, 2023, 10:13:20 PM UTC
// JavaScript timestamp (milliseconds)
1700000000000 → same date, but 1000x larger
// ISO 8601 (human + machine readable)
2023-11-14T22:13:20Z
// Quick reference:
Date.now() → 1700000000000 (ms)
Math.floor(Date.now() / 1000) → 1700000000 (sec)
// Common gotcha:
// PHP time() returns seconds
// JavaScript Date.now() returns millisecondsPro Tips
- Always store timestamps in UTC — convert to local time only for display
- Check if your timestamp is in seconds (10 digits) or milliseconds (13 digits)
- Use ISO 8601 format for API communication — it includes timezone information
- Be careful with date-only strings: '2025-01-15' is interpreted differently across browsers
When You Need This
- Debugging expiration times in JWT tokens and sessions
- Converting log file timestamps to readable dates
- Calculating time differences for performance monitoring
- Aligning timestamps across systems in different time zones
Free Tools Mentioned in This Article