Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates.
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Date: 9/15/2025, 10:49:41 AM
Enter Timestamp or Date
About Unix Timestamps
Overview: A Unix timestamp (also known as Unix time, POSIX time, or epoch time) is a system for describing a point in time. It is the number of seconds that have elapsed since January 1, 1970, at 00:00:00 UTC (the Unix epoch).
Unix timestamps are widely used in computing systems because they provide a simple, unambiguous way to represent time that is timezone-independent and easy to calculate with.
Common Applications:
• Database storage of datetime values
• API responses and data exchange
• File modification timestamps
• Session and token expiration times
• Event logging and analytics
• Cross-platform time synchronization
Timestamp Formats
Common Formats:
Unix Seconds (10 digits):
1704067200 = January 1, 2024, 00:00:00 UTC
Unix Milliseconds (13 digits):
1704067200000 = January 1, 2024, 00:00:00.000 UTC
ISO 8601:
2024-01-01T00:00:00.000Z
Key Dates and Milestones:
• 0: January 1, 1970 - Unix Epoch begins
• 1000000000: September 9, 2001 - Billennium (1 billion seconds)
• 2147483647: January 19, 2038 - Y2K38 problem (32-bit overflow)
• 1234567890: February 13, 2009 - Unix time palindrome
• 2000000000: May 18, 2033 - 2 billion seconds milestone
Important Considerations:
• Unix timestamps are always in UTC - no timezone information
• JavaScript uses milliseconds, while many systems use seconds
• Negative values represent dates before 1970
• Leap seconds are not represented in Unix time
• Y2K38 problem affects 32-bit systems storing time as signed integers
Programming Examples:
JavaScript:
Math.floor(Date.now() / 1000) // Current Unix timestamp
Python:
import time; int(time.time()) # Current Unix timestamp
PHP:
time(); // Current Unix timestamp
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