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Epoch Converter: Convert Between Epoch Time and Dates

Learn what epoch time is, how it differs from Unix timestamps, and convert between epoch and human dates with our free tool.

·Softween

Epoch time is a system for tracking time as a running total of seconds or milliseconds. It is widely used in programming, databases, and APIs for its simplicity and universality.

What Is Epoch Time?

Epoch time (also called Unix time or POSIX time) counts the number of seconds since the Unix epoch: January 1, 1970, 00:00:00 UTC. It provides a single numeric value that represents any point in time.

Epoch Time Formats

Different systems use different precisions:

FormatDigitsUnitExample
Unix seconds10seconds1709049600
Milliseconds13ms1709049600000
Microseconds16us1709049600000000
Nanoseconds19ns1709049600000000000

Converting Epoch Time

Epoch to Human-Readable

// JavaScript (milliseconds)
new Date(1709049600000).toISOString();
// "2024-02-27T16:00:00.000Z"
# Python (seconds)
from datetime import datetime, timezone
datetime.fromtimestamp(1709049600, tz=timezone.utc)
# 2024-02-27 16:00:00+00:00

Human-Readable to Epoch

// JavaScript
new Date("2024-02-27T16:00:00Z").getTime() / 1000;
// 1709049600

Common Epoch Values

DateEpoch (seconds)
Jan 1, 1970 (Unix epoch)0
Jan 1, 2000 (Y2K)946684800
Jan 1, 20251735689600
Jan 19, 2038 (32-bit overflow)2147483647

Why Use Epoch Time?

  • No time zone issues: Always represents UTC, avoiding ambiguity
  • Easy arithmetic: Add or subtract seconds for time calculations
  • Database friendly: Stored as a simple integer, fast to index and compare
  • Cross-platform: Consistent across programming languages and operating systems
  • Common Pitfalls

  • Seconds vs milliseconds: JavaScript uses milliseconds, most others use seconds
  • Time zone confusion: Epoch is always UTC; local time conversion must be explicit
  • 32-bit overflow: Systems using 32-bit signed integers will overflow in 2038
  • Negative values: Dates before 1970 are represented as negative numbers
  • Try It Yourself

    Convert between epoch timestamps and human-readable dates with our free Epoch Converter. Supports seconds, milliseconds, and multiple date formats.

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