unix/convert

• convertUnixToPlainDate: Convert a Unix timestamp to a plain date string in the format “YYYY-MM-DD”.
• convertUnixToPlainDateTime: Convert a Unix timestamp to a plain datetime string in the format “YYYY-MM-DDTHH:mm:ss”.
• convertUnixToPlainTime: Convert a Unix timestamp to a plain time string in the format “HH:mm:ss”.
• convertUnixToUtc: Convert a unix epoch value to a UTC Instant ISO string.
• convertUnixToZoned: Convert a unix epoch value to a zoned ISO 8601 datetime string.