The Date Is Correct in One System and Wrong in Every Other

Need to Convert a Date to a Different Format?

You have a date string in one format and you need it in another. ISO 8601 for an API. A human-readable string for an email. A custom format for a spreadsheet. You could write a formatter in your language of choice, or you could use a tool that detects the input and converts it instantly.

OnliTools Date Format Tool

OnliTools Date Format Tool — labelled Time Format Decoder on the page — detects the input date string or timestamp automatically and converts it to your chosen output format, directly in your browser. Paste your date, choose the output format, and copy the result. No upload. No install. Nothing leaves your device.

How to Use It

1. Go to onlitools.com/date-format.

1. Paste your date string.

1. Select the target output format and copy the converted date.

Great For

• Developers — quickly convert between ISO, Unix timestamp, and locale formats
• Data entry — standardize date formats before importing into databases
• Internationalization — convert dates for different regional requirements

Wrap Up

No script, no install, no upload to a server. OnliTools Date Format Tool converts your dates to the format you need in seconds.