Date & Time

Date and time tools for developers: timestamp converters, cron expression parsers with next-fire-time preview, timezone math.

All Date & Time

• Unix Timestamp Converter Convert between Unix timestamps, ISO 8601, and human-readable dates.
• Cron Expression Parser Parse cron expressions, see next 10 fire times, and get plain-English descriptions.
• Cron to Plain English Translate cron expressions to natural-language descriptions.
• Time Difference Calculator Compute the difference between two timestamps. Days/hours/minutes/seconds.
• Cron Expression Builder Build cron expressions visually: pick minute/hour/day/month/weekday. See description.
• Cron Expression Decoder Decode any cron expression to plain English. See next 10 fires in your timezone.
• Timezone Converter Convert any time between timezones. Side-by-side comparison for distributed teams.
• Age Calculator (Years, Months, Days) Calculate exact age from a birthdate. Years, months, days, hours, total days lived.
• Duration Formatter (ISO 8601, Humanize) Convert between seconds, ISO 8601 duration, and human-friendly "2h 15m" strings.
• ISO 8601 Datetime Builder + Parser Construct or parse ISO 8601 datetimes. UTC, offsets, fractional seconds, durations, intervals.
• Relative Time Formatter ("2 hours ago") Format any timestamp as a relative phrase: "5 minutes ago", "in 2 weeks". 60+ locales via Intl.RelativeTimeFormat.
• Business Days Calculator (Skip Weekends + Holidays) Count business days between two dates, or add N business days to a date. Skips weekends and configurable holidays (US, UK, EU presets).
• Countdown Timer Generator (Embeddable HTML) Build a live countdown to any future date. Outputs self-contained embeddable HTML / CSS / JS snippet.