• fix parsing negative year and Unix time (%Y, %G, %s)
• fix formatting negative year, century, Unix time (%Y, %G, %C, %y, %g, %s)
• fix %g parsing to use the same two-digit year threshold 69 as %y
• fix %s formatting and parsing on 32-bit platforms
• support parsing time zone offset with %:::z
• improve performance of parsing/formatting compound directives

• refactor code using built-in min and max functions

• support parsing week directives (%A, %a, %w, %u, %V, %U, %W)
• validate range of values on parsing directives
• fix formatting %l to show 12 at midnight

• support parsing time zone offset with name using both %z and %Z

• improve documents
• drop support for Go 1.16

• implement ParseInLocation for configuring the default location

• implement parsing/formatting time zone offset with colons (%:z, %::z, %:::z)
• recognize Z as UTC on parsing time zone offset (%z)
• fix padding on formatting time zone offset (%z)

• Fix compile error on 32-bit architectures.

Initial release.