Extended DATETIME-format strings

DATETIME-format functions support extended-format strings.

The following table shows the extended-format strings that the DATETIME-format functions support.
Format Description December 27, 1991 printed
%y %m %dj1 Japanese era with abbreviated era symbols H03 12 27
%Y %m %dj1 Japanese era with abbreviated era symbols H0003 12 27
%y %m %dj2 Japanese era with full era symbols A1A2B1B203 12 27
%Y %m %dj2 Japanese era with full era symbols A1A2B1B20003 12 27

In addition to the formats in the preceding table, these DATETIME-format functions support the GLS date and time specifiers. For a list of these specifiers, see GL_DATE environment variable and GL_DATETIME environment variable.