UUID
Generate random UUID v4 or time-ordered UUID v7 values, validate UUID versions, and inspect embedded UUID v7 timestamps locally.
Open UUIDDeveloper tool category
Identifier & Time Tools
Use these tools for identifiers, timestamps, and IPv4 network ranges. Check UUID formats, make time units explicit, and inspect CIDR masks and usable host addresses before configuring a network.
Common workflow
Where to start
4 recommended starting points
Timestamp
Convert Unix timestamps in seconds, milliseconds, microseconds, or nanoseconds and parse ISO 8601 dates. Inputs without an offset use UTC.
Open TimestampCron Expression Parser
Explain Unix five-field cron schedules and preview their next five occurrences in UTC or your browser's local time zone—without running a job or uploading input.
Open Cron Expression ParserIPv4 Subnet
Calculate IPv4 CIDR ranges, subnet masks, and usable host addresses locally.
Open IPv4 SubnetCalculate
Calculators
2 resources
Timestamp Add/Subtract Calculator – Unix & ISO
Add or subtract seconds, minutes, hours, or days from a Unix or ISO timestamp. Get the shifted ISO 8601 instant, Unix seconds, and milliseconds locally.
Timestamp Duration Calculator – Unix & ISO Difference
Calculate the signed duration between two Unix or ISO 8601 timestamps, with millisecond, second, minute, hour, and day results. Runs locally.
Understand the concepts
Related guides
2 resources
Unix Timestamp Seconds vs Milliseconds
Learn how to identify 10-digit and 13-digit Unix timestamps, convert between seconds and milliseconds, and avoid timezone mistakes.
UUID Versions, Variants & Validation Explained
Understand UUID versions 1 through 8, RFC variant bits, canonical UUID text, and what structural UUID validation can and cannot prove.