Date Picker & Formatter — Multi-Format Date Converter

Pick a date from a custom calendar and see it in 10+ formats instantly. Convert timezones, do date math, calculate business days, and build custom format strings. 100% client-side — no data leaves your browser.

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Select a date from the calendar below

Timezone:

: :

Quick Picks

Custom Format String:

Available Tokens

YYYY4-digit year

YY2-digit year

MMMMFull month

MMMShort month

MMMonth 01–12

MMonth 1–12

DDDay 01–31

DDay 1–31

ddddFull weekday

dddShort weekday

HHHour 00–23

hhHour 00–12

mmMinute 00–59

ssSecond 00–59

AAM / PM

aam / pm

wwWeek number

DDDDay of year

Z+HH:MM offset

ZZ+HHMM offset

Operation:

Amount:

Unit:

Result

New Date

Starting Date:

Business Days to Add:

Exclude (US Federal Holidays):

Exclude holidays

Date 1:

Date 2:

How to Use the Date Picker & Formatter

Pick a date using the custom calendar — click any day to select it, or use Quick Picks for common dates.
Adjust time using the hour/minute/second inputs below the calendar.
View formats — see your selected date in 10+ formats simultaneously, with one-click copy.
Switch timezones using the dropdown to convert the date across world timezones.
Custom format — build your own format string using tokens like YYYY, MM, DD, HH, mm, ss.
Date Math — add or subtract days, weeks, months, years, hours, or minutes from your date.
Business Days — calculate the next business day, skipping weekends and US federal holidays.
Date Difference — compare two dates and see the difference in days, weeks, months, and years.

Supported Date Formats

This tool outputs dates in all major international formats simultaneously. No need to remember the difference between ISO 8601, RFC 2822, US, EU, and UK date formats — just pick a date and see them all at once. Copy any format with a single click.

Frequently Asked Questions

ISO 8601 is the international standard for date and time representation: YYYY-MM-DDTHH:mm:ssZ. For example, 2026-06-24T12:00:00Z. It's universally unambiguous, sorts chronologically as text, and is used by APIs, databases, and file systems worldwide.

US format is MM/DD/YYYY (month first), while EU format uses DD.MM.YYYY or DD/MM/YYYY (day first). This ambiguity is a common source of bugs — "06/04/2026" could mean June 4th or April 6th depending on context. ISO 8601 eliminates this confusion.

Business days exclude Saturdays and Sundays by default. When "Exclude holidays" is checked, US federal holidays are also skipped (New Year's Day, MLK Day, Presidents Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Thanksgiving, Christmas). The calculation moves forward or backward through the calendar skipping non-business days.

Week numbers follow ISO 8601, where Week 1 is the week containing the first Thursday of the year. This tool uses the locale's week numbering. For example, January 1, 2026 falls in Week 1 of 2026.

Use Cases

International Date Formatting

Format dates correctly for international audiences with different locale preferences, ensuring proper date representation across regions.

Format Conversion

Convert between date formats like MM/DD/YYYY to YYYY-MM-DD for database imports, API requirements, or system migrations.

API Date Generation

Generate properly formatted date strings for API payloads, webhooks, and third-party service integrations.

Ambiguous Date Parsing

Parse and interpret ambiguous date inputs like 01/02/2026 to determine whether they represent January 2nd or February 1st.

Locale-Aware Display

Create locale-aware date displays that automatically adapt to user regional settings for better internationalization.