The date format used must be ISO 8601, which is an international standard for date and time representation.
Dates must be expressed in the format of YYYY-MM-DD, where YYYY represents the year, MM represents the month (with leading zeros), and DD represents the day (with leading zeros).
Times can also be included in the format, expressed as HH:MM:SS, where HH represents the hours in 24-hour format, MM represents the minutes, and SS represents the seconds.
If the time zone is known, it can also be included using the format ±HH:MM, where the plus or minus sign indicates the time zone offset from UTC/GMT and HH:MM represent the hours and minutes offset, respectively.
Examples of valid ISO 8601 date formats include:
2023-04-02 (for a date without a time)
2023-04-02T15:30:00 (for a date with a time)
2023-04-02T15:30:00-05:00 (for a date with a time and time zone offset)
2023-04-02T15:30:00+02:00 (for a date with a time and time zone offset)