Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates

2025-07-11T19:15:25

Reference Timestamps

Unix Epoch (January 1, 1970)

0

Y2K (January 1, 2000)

946684800

Y2K38 Problem (January 19, 2038)

2147483647

Current Timestamp

1752261325

One Day Ago

1752174925

One Week Ahead

1752866125

About Unix Timestamps

A Unix timestamp (also known as POSIX time or Epoch time) represents the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC (the Unix Epoch). It's widely used in computer systems and programming for date and time representation.

Unix Timestamp Features

  • Time zone independent - Unix timestamps are always in UTC
  • Easy to perform date arithmetic (adding/subtracting time)
  • Compact representation of date and time
  • Commonly used in databases, logs, and APIs
  • Standard for representing time in many programming languages
  • Limited by the Year 2038 problem in 32-bit systems

Format Tokens for Custom Date Formats

YYYY - Four-digit year (e.g., 2023)
YY - Two-digit year (e.g., 23)
MM - Month with leading zero (01-12)
M - Month without leading zero (1-12)
DD - Day with leading zero (01-31)
D - Day without leading zero (1-31)
HH - Hours in 24h format (00-23)
hh - Hours in 12h format (01-12)
mm - Minutes with leading zero (00-59)
ss - Seconds with leading zero (00-59)
A/a - AM/PM or am/pm
Z - Timezone offset

Unix Timestamp Limitations

Y2K38 Problem: 32-bit systems store Unix time as a signed 32-bit integer, which will overflow on January 19, 2038, causing the timestamp to reset to negative values.

Leap Seconds: Unix time does not account for leap seconds, which are occasionally added to UTC to keep it synchronized with Earth's rotation.

Historical Dates: Unix timestamps cannot represent dates before January 1, 1970 with positive values.