javascript regex iso datetime

Question

does anyone have a good regex pattern for matching iso datetimes?

ie: 2010-06-15T00:00:00

Answer 1

I have made this regex and solves the validation for dates as they come out of Javascript's .toISOString() method.

^[0-9]{4}-((0[13578]|1[02])-(0[1-9]|[12][0-9]|3[01])|(0[469]|11)-(0[1-9]|[12][0-9]|30)|(02)-(0[1-9]|[12][0-9]))T(0[0-9]|1[0-9]|2[0-3]):(0[0-9]|[1-5][0-9]):(0[0-9]|[1-5][0-9])\.[0-9]{3}Z$

Contemplated:

• Proper symbols ('-', 'T', ':', '.', 'Z') in proper places.
• Consistency with months of 29, 30 or 31 days.
• Hours from 00 to 23.
• Minutes and seconds from 00 to 59.
• Milliseconds from 000 to 999.

Not contemplated:

• Leap years.

Example date: 2019-11-15T13:34:22.178Z

Example to run directly in Chrome console: /^[0-9]{4}-((0[13578]|1[02])-(0[1-9]|[12][0-9]|3[01])|(0[469]|11)-(0[1-9]|[12][0-9]|30)|(02)-(0[1-9]|[12][0-9]))T(0[0-9]|1[0-9]|2[0-3]):(0[0-9]|[1-5][0-9]):(0[0-9]|[1-5][0-9])\.[0-9]{3}Z$/.test("2019-11-15T13:34:22.178Z");

Regex flow diagram (Regexper):