New sh_year_is_leap() determines if a Jalali year is a leap year.

New accessor and replacement functions are added to get/set the components of Jalali date-time objects.

New family of functions for rounding Jalali dates to a specific unit of time:

• sh_floor() rounds a jdate object down to the previous unit of time.

• sh_ceiling() rounds a jdate object up to the next unit of time.

• sh_round() rounds a jdate object up or down, depending on what is closer.

New seq.jdate() generates regular sequences of Jalali dates.

as.POSIXlt() now errors with jdate and jdatetime input. In order to cast jdate and jdatetime to POSIXlt, first, they should be converted to Date and POSIXct respectively.

jdate() now truncates numeric input toward zero before generating a jdate object.

jdatetime() now truncates numeric input toward zero before generating a jdatetime object.

Fixed a bug where names were dropped after calling format() upon a jdate or jdatetime object.