v1.4.0

• min function
• max function
• diff function

v1.3.0

• add toObject function
• add isDate function
• add isPersianDate function
• add isSameOrBefore function
• add isSameOrAfter function
• add isBetween function

v1.2.0

• add isBefore function
• add isAfter function

v1.1.0

• add clone function
• add isSame function

v1.0.2

change version to 1.2.0 990624