Updating documentation for new datetime format (#6337)

* Updating documentation for new datetime format introduced in OS 2.12

Signed-off-by: Prabhat Sharma <ptsharma@amazon.com>

* Update _field-types/supported-field-types/date.md

Co-authored-by: Naarcha-AWS <97990722+Naarcha-AWS@users.noreply.github.com>
Signed-off-by: Prabhat <20185657+CaptainDredge@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>
Signed-off-by: Naarcha-AWS <97990722+Naarcha-AWS@users.noreply.github.com>

* Update date.md

Signed-off-by: Naarcha-AWS <97990722+Naarcha-AWS@users.noreply.github.com>

* Apply suggestions from code review

Signed-off-by: Naarcha-AWS <97990722+Naarcha-AWS@users.noreply.github.com>

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Signed-off-by: Prabhat Sharma <ptsharma@amazon.com>
Signed-off-by: Prabhat <20185657+CaptainDredge@users.noreply.github.com>
Signed-off-by: Naarcha-AWS <97990722+Naarcha-AWS@users.noreply.github.com>
Co-authored-by: Prabhat Sharma <ptsharma@amazon.com>
Co-authored-by: Naarcha-AWS <97990722+Naarcha-AWS@users.noreply.github.com>
Co-authored-by: kolchfa-aws <105444904+kolchfa-aws@users.noreply.github.com>