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What Is Epoch / Unix Timestamp?
Epoch time (also called Unix timestamp) is the number of seconds that have elapsed since January 1, 1970 at 00:00:00 UTC (the Unix epoch), not counting leap seconds. It is widely used in programming, databases, and system logs as a compact, timezone-independent way to store and compare time values.
Common epoch time values: 0 = January 1, 1970 (start of Unix epoch); 86400 = January 2, 1970 (one day later); 1720771200 = July 12, 2025. Tools like epoch time converter online help developers quickly translate between these integer values and human-readable dates.
Our converter supports Unix timestamp in seconds, milliseconds, and microseconds, and also handles the year 2038 problem (32-bit overflow) by supporting 64-bit timestamps.
ISO 8601 Date and Time Format Standard
ISO 8601 is the international standard for date and time representation. The basic format is YYYY-MM-DDTHH:mm:ss.sssZ where T separates the date from time, and Z indicates UTC. For example, 2025-07-12T14:30:00Z represents July 12, 2025 at 2:30 PM UTC. If a timezone offset is used instead of UTC, it appears as +HH:mm or -HH:mm (e.g., 2025-07-12T22:30:00+08:00).
ISO 8601 also supports date-only (YYYY-MM-DD), time-only (HH:mm:ss), ordinal dates (YYYY-DDD), and week dates (YYYY-Www-D). Our converter handles all ISO 8601 variants including the basic format without separators (YYYYMMDDTHHmmssZ).
Military Time (24-Hour Clock) Conversion Guide
Military time (also called 24-hour time) runs from 0000 (12:00 AM) to 2359 (11:59 PM) without the AM/PM designation. To convert from 12-hour to 24-hour: for 12:00 AM to 12:59 AM, use 0000 to 0059; for 1:00 AM to 11:59 AM, keep the same hours; for 12:00 PM to 12:59 PM, use 1200 to 1259; for 1:00 PM to 11:59 PM, add 12 to the hours.
Common military time conversions: 0000 = 12:00 AM (midnight), 0600 = 6:00 AM, 1200 = 12:00 PM (noon), 1430 = 2:30 PM, 2359 = 11:59 PM.
Decimal Time Conversion for Payroll & Billing
Decimal time converts hours and minutes into a decimal fraction of an hour. The formula is: minutes / 60 = decimal portion. For example, 8 hours and 45 minutes = 8 + (45 / 60) = 8.75 hours. This format is commonly used in payroll systems, time tracking software, and freelance billing.
Use our decimal time conversion chart for quick lookup: 15 minutes = 0.25, 30 minutes = 0.50, 45 minutes = 0.75. Our converter handles both directions -- decimal to hours:minutes and hours:minutes to decimal.
SQL DateTime Format Reference
SQL databases store date-time values in different internal formats. MySQL uses the TIMESTAMP data type (stored as Unix epoch internally with range 1970 to 2038) and DATETIME (stored as plain text with range 1000 to 9999). PostgreSQL uses TIMESTAMP (microsecond precision integer) and TIMESTAMPTZ (timezone-aware). SQLite stores as text (ISO 8601 string), integer (Unix epoch), or real (Julian day number) depending on the declared type.
The standard SQL date time format is YYYY-MM-DD HH:MM:SS (e.g., 2025-07-12 14:30:00). Our converter translates between SQL formats and Unix timestamps, ISO 8601, and other standards.
Date Time Formatting in Programming Languages
Different programming languages have their own approaches to date time formatting. In JavaScript, use toISOString() for ISO 8601 format, toLocaleString() for locale-specific formatting, or getTime() to get Unix timestamp in milliseconds. In Python, use datetime.strftime() with format codes like %Y-%m-%d %H:%M:%S. In Java, use SimpleDateFormat or the newer java.time.format.DateTimeFormatter. In Linux, use the date command for shell-based time conversion and timestamp formatting in scripts and system logs.
The correct format of time stamping in code matters for API compatibility, database storage, and log parsing. Our converter helps you test and validate your formatted timestamps before deploying to production.