All Time Format Guides (50)

Every time format page includes an explanation of the format, a live converter, a quick-reference table with real example values, common use cases and FAQ. Convert any date-time to the format you need — or paste a value to decode it.

Popular Time Format Guides

The formats most developers, analysts and administrators search for daily.

Unix Timestamp

Free Unix timestamp converter. Convert epoch seconds, milliseconds, microseconds and nanoseconds to human-readable dates instantly. UTC & local time, one click copy.

ISO 8601

Convert any date-time to ISO 8601 format: extended, basic and interval forms. Free converter with pattern reference, examples and FAQ. UTC & local timezone support.

ISO Week Date

Convert any date to the ISO 8601 week date (year-week-day). See the week number, the ISO year and the weekday for any date. Free online converter.

ISO Ordinal Date

Convert any date to the ISO 8601 ordinal date: year + day-of-year (e.g. 2026-225). See which day of the year any date is. Free online converter.

Military Time

Convert any time to military time (24-hour clock) instantly. See HHmm format, seconds variant and 12-hour equivalent. Free online military time converter.

Decimal Time

Convert time to decimal hours for payroll and time tracking. 7:30 becomes 7.50 hours instantly. Free decimal time converter with chart and examples.

RFC 2822

Convert any date to RFC 2822 format (Sat, 13 Aug 2026 14:30:00 +0000) for email headers, HTTP headers and RSS. Free online converter with examples.

RFC 3339

Convert any date to RFC 3339 format (2026-08-13T14:30:00Z or +00:00 offset). The timestamp standard for JSON APIs and cloud services. Free converter.

SQL Datetime

Convert dates to SQL datetime formats: standard YYYY-MM-DD HH:mm:ss, MySQL TIMESTAMP, PostgreSQL and SQL Server styles. Free converter for database work.

Julian Date

Convert calendar dates to Julian Date (JD) and Modified Julian Date (MJD). Continuous day count for astronomy, aerospace and date arithmetic. Free converter.

HTTP Date

Convert dates to HTTP header format (Thu, 13 Aug 2026 14:30:00 GMT), Netscape cookie expiry, and SMTP dates. Free converter for header debugging.

Excel Serial Date

Convert dates to Excel serial numbers (45251.61) and back. Supports 1900 and 1904 date systems. Free converter for spreadsheet and CSV work.

GPS Time

Convert dates to GPS time: GPS week & seconds since 1980-01-06, and NMEA sentences. Free converter for GNSS and navigation development.

UTC Time

Convert any local time to UTC (Coordinated Universal Time) instantly. See the UTC string, Z-suffixed ISO form and GMT equivalent. Free UTC converter.

Cron Expression

Generate cron expressions from a date-time and see the next 5 runs. Learn the 5-field cron syntax with examples. Free cron expression converter.

Developer, Database & System Formats

Language-specific formatters, log dialects, database literals and OS timestamps.

Java Date Time Format Converter

Convert dates to Java java.time formats: ISO_INSTANT, ISO_LOCAL_DATE_TIME, ISO_OFFSET_DATE_TIME, ISO_ZONED_DATE_TIME and more. Free converter for Java developers.

Python Datetime Format

Convert dates to Python datetime formats: isoformat() output and time.ctime() string. Free converter showing exactly what Python prints.

Go Time Format Converter

Convert dates to Go time.Time formats: layout reference time, Kitchen, Stamp, StampNano, RFC822, RFC1123 and Z variants. Free converter for Go developers.

.NET Date Format Converter

Convert dates to .NET standard format specifiers: O, s, t, d, f, g, u. See exactly what DateTime.ToString() produces for each pattern. Free converter.

PHP Date Format Converter Constants)

Convert dates to PHP date constants: DATE_COOKIE, DATE_RFC850 and DATE_RFC1036. See exactly what date() outputs. Free converter for PHP developers.

Ruby DateTime Format

Convert dates to Ruby formats: Time#iso8601, DateTime#iso8601 and common strftime patterns. Free converter for Ruby developers.

Swift Date Format

Convert dates to Swift formats: ISO8601DateFormatter output and DateFormatter patterns. Free converter for Swift and iOS developers.

Log Timestamp Formats

Convert dates to log timestamp formats: Syslog RFC 3164, Apache/Nginx combined log, Docker log, Splunk and Android Logcat. Free converter for log analysis.

Windows FILETIME

Convert dates to Windows FILETIME (100-ns ticks since 1601), OLE Automation dates and LDAP timestamps. Free converter for Windows and AD developers.

NTP Timestamp

Convert dates to NTP timestamps: 64-bit NTP format (seconds + fraction since 1900) and hex representation. Free converter for network time debugging.

RSS & Atom Date Format

Convert dates to feed formats: RSS pubDate (RFC 822), Atom updated (W3C DTF), iCalendar DTSTART and RFC 3339. Free converter for feed development.

YAML & TOML Date Format

Convert dates to YAML/TOML timestamp formats: date-only, local datetime, offset datetime and UTC. Free converter for config file development.

Snowflake ID & UUID v1 Timestamp Decoder

Decode timestamps from Twitter/X Snowflake IDs, Discord snowflakes, UUID v1 and MongoDB ObjectIds. Free ID timestamp decoder for developers.

JSON & Protobuf Timestamp

Convert dates to serialization formats: JSON string, Protobuf Timestamp (seconds/nanos since epoch), BSON and XML Schema dateTime. Free converter.

Oracle & DB2 Datetime Format

Convert dates to Oracle, DB2 and Teradata datetime formats: TO_CHAR patterns, TIMESTAMP WITH TIME ZONE and database literals. Free converter.

Specialized & Niche Formats

Scientific, financial, medical, embedded, gaming and sci-fi time scales.

BigQuery, Snowflake & ClickHouse Timestamp

Convert dates to cloud database timestamp formats: BigQuery, Snowflake, ClickHouse, kdb+, InfluxDB and Presto/Hive. Free converter for data engineering.

Avro & Parquet Timestamp

Convert dates to Avro and Parquet logical timestamp types: date, time-millis, time-micros, timestamp-micros and INT96. Free converter for data engineering.

Japanese Era & Thai Buddhist Date

Convert dates to Japanese era (Reiwa, Heisei), Thai Buddhist (BE) and Chinese date formats. Free converter for localization and calendar systems.

Week of Year

Convert any date to its week number and ISO year. See which week a date falls in with the year-week string. Free week number converter.

MATLAB datenum

Convert dates to MATLAB datenum, NetCDF time and Mathematica AbsoluteTime values. Free converter for scientific computing.

TAI64N Timestamp

Convert dates to TAI64N timestamps: 64-bit seconds + 32-bit nanoseconds since 1970 TAI. Free converter for secure logging and time-sync systems.

BeiDou, GLONASS & Galileo Time

Convert dates to BeiDou, GLONASS and Galileo system times. See each GNSS time scale's week count and seconds. Free converter for navigation systems.

Stardate & Sci-Fi Time

Convert dates to Star Trek stardates (TNG & TOS), Mars Sol Date (MSD), Barycentric Julian Day and Swatch Internet Time. Fun sci-fi time converter.

Hexadecimal Time & Retro Formats

Convert dates to hexadecimal time (0x0000-0xFFFF), GameCube system time and Lotus 1-2-3 serial dates. Free converter for retro and game developers.

CAN Bus & AUTOSAR Timestamp

Convert dates to CAN bus, AUTOSAR and RTOS tick timestamps. See raw tick counts and system time values. Free converter for embedded developers.

DICOM & HL7 Date Time

Convert dates to DICOM DA/TM and HL7 timestamp formats for medical imaging and healthcare systems. Free converter for health IT developers.

FIX & Financial Timestamp

Convert dates to FIX protocol UTCTIMESTAMP, Bloomberg and Reuters RIC timestamps, and EDIFACT formats. Free converter for financial systems.

Mainframe Date Converter

Convert dates to mainframe formats: COBOL dates, RPG, MUMPS $H and OpenVMS binary time. Free converter for legacy systems.

SAP Date & Timestamp

Convert dates to SAP formats: ABAP DATE (DATS, YYYYMMDD), TIMS and SAP UTC timestamps. Free converter for SAP developers and consultants.

Systemd, BIOS & Filesystem Timestamp

Convert dates to systemd journal, BIOS BCD, DOS FAT, Mac HFS, POSIX touch and Git commit timestamps. Free converter for Linux and forensics.

IoT Protocol Timestamp

Convert dates to IoT protocol timestamps: CoAP, LoRaWAN, Zigbee, UEFI and VxWorks. Free converter for embedded IoT developers.

Game Engine Time

Convert dates to game time: frame count at 60fps, Unity Time and Unreal Engine time. Free converter for game developers.

Blockchain Timestamp Converter

Convert dates to blockchain time: Bitcoin block height, Ethereum epoch and slot numbers. Free converter for Web3 developers.

OpenTelemetry & AWS SigV4 Timestamp

Convert dates to OpenTelemetry, AWS Signature V4, browser performance and Chrome network timestamps. Free converter for observability and cloud devs.

Social Media Timestamp

Convert dates to social media timestamp formats: Facebook, X/Twitter, Discord display and snowflake IDs. Free converter for social API development.

Need to Convert Between All Formats?

Use the main Time Format Converter for instant conversion across 100+ formats — epoch, ISO 8601, RFC 3339, SQL datetime, military time and more in one click.

Open Time Format Converter