Search criteria - to search recurring invoices series.

The date and time, in [Internet date and time format](https://tools.ietf.org/html/rfc3339#section-5.6). Seconds are required while fractional seconds are optional.

Note: The regular expression provides guidance but does not reject all invalid dates.

The date and time, in [Internet date and time format](https://tools.ietf.org/html/rfc3339#section-5.6). Seconds are required while fractional seconds are optional.

Note: The regular expression provides guidance but does not reject all invalid dates.

The stand-alone date, in [Internet date and time format](https://tools.ietf.org/html/rfc3339#section-5.6). To represent special legal values, such as a date of birth, you should use dates with no associated time or time-zone data. Whenever possible, use the standard `date_time` type. This regular expression does not validate all dates. For example, February 31 is valid and nothing is known about leap years.

The stand-alone date, in [Internet date and time format](https://tools.ietf.org/html/rfc3339#section-5.6). To represent special legal values, such as a date of birth, you should use dates with no associated time or time-zone data. Whenever possible, use the standard `date_time` type. This regular expression does not validate all dates. For example, February 31 is valid and nothing is known about leap years.