Data Tinker
data-tinker / dates and times / date and time
Date and time generator
A random date in the chosen format, with the time too. The tokens are Java's: {dd} day, {MM} month, {yyyy} year ({aaaa} also works), {HH} hour, {mm} minutes, {ss} seconds.
Free, no sign-up and no limits. Everything is generated in your browser: nothing is sent anywhere.
What if it filled itself in?
With the Data Tinker extension there is no copying and pasting: it fills the whole form from a panel next to the page, with templates per form and rules for your own fields.
Add to Chrome freeAll generators
Profiles
Personal documents
Banking
Addresses and phones
Justice
Property and utilities
Vehicles
Dates and times
Texts
Technology
Test data: valid in format and check digits, but made up. A randomly generated number may match a real person's; do not use them on real systems.