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#format
Java
java.time — Format and Parse
`DateTimeFormatter` replaces `SimpleDateFormat` (which was not thread-safe). Constants for the common formats; pattern strings for custom layouts.
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Bash
Format Date Like a Pro
`date` accepts a format string + optional override of the date being formatted. The +%FT%TZ form gives you ISO-8601 / RFC-3339 in one call.
JavaScript
Format Relative Time
Returns a human-readable relative time string ("3 days ago", "in 2 hours") using the Intl.RelativeTimeFormat API. Automatically selects the most appropriate unit (seconds, minutes, hours, days, weeks, months, years) based on the elapsed time. Fully localised — pass any BCP 47 locale.
PHP
Human-Readable "Time Ago"
Convert a timestamp into a short relative phrase: "just now", "5 minutes ago", "3 days ago". Falls back to an absolute date once the delta exceeds a year.
PHP
Convert Timestamp to User Timezone
Convert a stored UTC timestamp into the viewer's timezone for display. Round-trip safe: re-converting to UTC always gives back the original timestamp.
PHP
Number to Ordinal (1st, 2nd, 3rd)
Convert an integer to its English ordinal form ("1st", "2nd", "3rd", "11th", "22nd", "103rd"). Pure rule-based; no library needed.
Python
textwrap dedent + fill (Multi-line Strings)
`textwrap.dedent` strips common leading whitespace from a triple-quoted string — finally, you can indent multiline strings inside functions without breaking the formatting. `fill` wraps to a max width.
PHP
Pretty-Print JSON
One-liner wrapper around json_encode with the right flags: indented, no escaped slashes, no escaped unicode. Use it everywhere instead of raw json_encode for human-readable output.
TypeScript
Capitalize / Title-Case
Two common case transforms. `capitalize` for the first letter only; `titleCase` for every word, with small "stop words" left lowercase except at the edges.
PHP
Format Duration in Seconds
Render a number of seconds as a human-friendly duration like "1h 23m 45s" — automatically trimming leading zero units. Handy for elapsed-time displays in dashboards.
JavaScript
Format File Size
Converts a raw byte count into a human-readable string with the appropriate unit (B, KB, MB, GB, TB). Uses 1024-based (binary) units by default or optionally 1000-based (SI) units. Useful for upload progress indicators, file browsers, and storage dashboards.
TypeScript
Format Duration in ms
Render a number of milliseconds as a human-friendly duration: "1h 23m 45s". Skips leading-zero units automatically so short durations are concise.
PHP
Format Money with Currency
Format an amount of cents as a localized currency string using NumberFormatter from intl. Falls back to a basic sprintf if intl isn't available.
Rust
Format Strings (println! / write!)
Rust's format macros take an inline format string with `{}` placeholders. Named arguments, alignment, precision, debug formatting — all in the format spec.
Python
Format Bytes / Duration Human-Readable
Two formatting helpers everyone re-implements: bytes → "1.5 MB", seconds → "1h 23m 45s". Base-1024 IEC units by default for bytes.
JavaScript
Format Currency
Formats a number as a locale-aware currency string using the built-in Intl.NumberFormat API. Supports any ISO 4217 currency code and any BCP 47 locale tag. No external library required — handles symbol placement, thousands separators, and decimal places automatically per locale rules.
Go
time.Format — The Reference Time
Go's time formatting uses a reference date instead of strftime tokens: `Mon Jan 2 15:04:05 MST 2006` (which is 01/02 03:04:05PM '06 -0700, or 1/2/3/4/5/6/7 — mnemonic). Strange at first, instantly memorable.