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Date in ISO 8601 format (YYYY-MM-DD).
stringdate^(?:[1-9]\d{3}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|02-(?:0[1-9]|1\d|2[0-8]))|(?:(?:\d{2}(?:0[48]|[2468][048]|[13579][26]))|(?:[02468][048]00|[13579][26]00))-02-29)$