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Date-Time Format Converter

DeveloperTime

Free online Date-Time Format Converter. Convert between Unix timestamp, ISO 8601, RFC 3339, MongoDB dates, and more. Auto-detects input format.

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INPUT

Auto Process

OUTPUT

Client Side

JS locale date string

ISO 8601

ISO 9075

RFC 3339

RFC 7231

Unix timestamp

Timestamp

UTC format

Mongo ObjectID

Excel date/time

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Guide

What is Date-Time Format Converter?

The Date-Time Format Converter is a tool that transforms date and time strings between different standard formats. It automatically detects input formats and converts them into multiple widely-used date-time standards.

Supported Formats

Format	Description	Example
JS Locale	JavaScript’s local date string format	Wed Jan 01 2021 12:00:00 GMT+0000
ISO 8601	International date/time standard	2021-01-01T12:00:00+00:00
ISO 9075	SQL standard date format	2021-01-01 12:00:00
RFC 3339	Internet date/time format	2021-01-01T12:00:00Z
RFC 7231	HTTP date format	Wed, 01 Jan 2021 12:00:00 GMT
Unix Timestamp	Seconds since Unix epoch	1609488000
Timestamp	Milliseconds since Unix epoch	1609488000000
UTC Format	Coordinated Universal Time	Wed, 01 Jan 2021 12:00:00 UTC
Mongo ObjectID	MongoDB’s timestamp format	5ff01ae000000000000000
Excel DateTime	Microsoft Excel’s date format	44197.5

Key Features

Auto-detection of input format
Real-time conversion
Support for multiple timezone formats
One-click copying of converted formats
No client-side dependencies
Privacy-focused (all conversions happen locally)

Common Use Cases

API development and testing
Database migrations
Log analysis
Cross-platform development
Data integration
Debugging timestamp issues

How to Use

Enter any date-time string in the input field
The tool automatically detects the format
View converted formats in all supported standards
Click the copy icon next to any format to copy it
Use the reset button to clear all fields

 FAQ

Can I convert dates between different timezones?

Yes, the tool supports timezone conversion. Enter your date-time with timezone information, and it will be converted to UTC and other standard formats.
How do I get a MongoDB ObjectID from a timestamp?

Enter your timestamp or date string, and the tool will generate a corresponding MongoDB ObjectID in the output section.
Why are Excel dates showing as numbers?

Excel stores dates as serial numbers, counting days since January 1, 1900. Our tool converts between Excel's numeric format and standard date formats.
What format should I use for database storage?

ISO 8601 or Unix timestamp are recommended for database storage. Both formats are standardized and widely supported across different systems.
How do I validate if my date string is in correct ISO format?

Enter your date string in the input field. If it's valid ISO 8601, the tool will recognize it and show the standardized version in the ISO 8601 output field.
Can I convert between 12-hour and 24-hour time formats?

Yes, the tool automatically converts between 12-hour (AM/PM) and 24-hour formats across all supported standards.