Time & DateFree Tool

Date Format Tester

Provided byDevBoltdevbolt.dev

Tests date format patterns for strftime, date-fns, Moment.js, Go, and Java with live preview.

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About this tool

What Date Format Tester does

Date Format Tester is a browser-based utility that lets developers and designers verify how date format patterns render across five major libraries: strftime, date-fns, Moment.js, Go, and Java. Users input a pattern string and select a target library to instantly see the formatted result, removing the need to switch between documentation or test environments. The tool also includes a token reference table and preset options for common standards like ISO 8601 and RFC 2822, making it useful for quick validation or learning new syntax.

Step by step

How to use the DevBolt Date Format Tester

  1. 1

    Enter a date format pattern matching one of the supported styles (strftime, date-fns/Unicode, Go, or Java)

  2. 2

    Select the desired library from the Format Style dropdown to apply the pattern

  3. 3

    Choose a preset or input a specific date and time to test against

  4. 4

    View the live preview output showing how the pattern interprets the date

  5. 5

    Use the token reference table to understand each format specifier

Is it right for you

Best for

Developers and designers who need to quickly test and compare date format patterns across multiple programming libraries without leaving their browser.

Limitations

  • Pattern support varies between libraries; a format valid in one may not work in another
  • No built-in unit conversion or timezone adjustment beyond preset options
  • Results are estimates based on standard library interpretations and may differ in production code
Questions

Date Format Tester FAQ

Can I test custom date formats that aren't in the preset list?
Yes, you can enter any format pattern manually in the input field; the tool will process it against your selected library and show the result in real time.
Does the tool store or send my format patterns to a server?
No, all processing happens in your browser; your input data never leaves your device according to the site's description.
Which libraries are supported for date format testing?
The tool supports strftime (Python, PHP, Ruby), Unicode/date-fns/Moment.js, Go's time.Format, and Java's SimpleDateFormat.
What should I do if my formatted date looks incorrect or unexpected?
Check the token reference table for the correct specifier syntax for your chosen library, or try a preset format to compare how the pattern is typically interpreted.
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