#formatDateTime

Formats a date and time string using the provided format string.

#formatDateTime(value, format)

Category Dates and timesValid in Property value

Parameters

Name	Type	Description
value	path | string	A date and time.
format	string	A .NET date format string, such as yyyy-MM-dd.

Returns

string

Examples

Date only

source.json

{
    "when": "2026-01-15T10:30:00"
}

transformer.json

{
    "result": "#formatDateTime($.when, 'yyyy-MM-dd')"
}

output.json

{
    "result": "2026-01-15"
}

Try it in the playground →

Related

#parseDateTime