Module:YMD to ISO/doc

Any input which is not a valid DMY date is passed through unchanged. This template is designed to preprocess dates for use with the #time parser function, which is unable to convert YMD dates, and for use with templates such as Date or ISO date which are implemented using the #time parser function.

Usage
or via template:

Examples
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or via template:

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For more examples, see Template:YMD to ISO.