LOCAL-ONLY UTILITIES
Tools
Useful time, date, and developer utilities. Every calculation stays in the current browser and never uploads an input or result.
01
Time and date
Use explicit date, time-zone, and workday rules instead of hidden guesses.
TIME
Timestamp Converter
Convert Unix seconds, milliseconds, UTC, and local time.
Open tool →TIMEDate Formatter
Parse dates explicitly and format them with documented tokens.
Open tool →TIMETime Zone Converter
Compare one instant across named IANA time zones.
Open tool →TIMEWorkday Calculator
Count Monday–Friday workdays with manual exclusions.
Open tool →02
Developer utilities
Work with standard JSON, URL components, UTF-8 Base64, and bounded regular-expression tests.
DEV
JSON Formatter & Validator
Validate, pretty-print, or minify standard JSON.
Open tool →DEVURL Encoder & Parser
Encode/decode components and inspect or rebuild query parameters.
Open tool →DEVBase64 Encoder & Decoder
Encode and decode UTF-8 text as Base64.
Open tool →DEVRegex Tester
Test JavaScript regular expressions inside a bounded Worker.
Open tool →