Dev quality-of-life

Convert Unix epoch ↔ ISO 8601 / human dates with timezone support.

Decode cron expressions into plain English, preview upcoming run times, and verify 5/6/7-field crontab schedules before deployment.

Parse a UA string into browser, OS and device details.

IPv4 CIDR math — netmask, network, broadcast, host range and binary view.

Convert local timestamp placeholders across common world time zones.

Break any URL into protocol, host, port, path, query, and fragment, with the query string decoded into readable key/value pairs — all client-side.

Convert Unix file permissions between checkbox, octal (755), and symbolic (rwxr-xr-x) notation with setuid, setgid, and sticky bits.