An SAP Consultant: ABAP - Date and Time function modules

CALCULATE_DATE	Calculates the future date based on the input .
DATE_TO_DAY	Returns the Day for the entered date.
DATE_COMPUTE_DAY	Returns weekday for a date
DATE_GET_WEEK	Returns week for a date
RP_CALC_DATE_IN_INTERVAL	Add days / months to a date
DAY_ATTRIBUTES_GET	Returns attributes for a range of dates specified
MONTHS_BETWEEN_TWO_DATES	To get the number of months between the two dates.
END_OF_MONTH_DETERMINE_2	Determines the End of a Month.
HR_HK_DIFF_BT_2_DATES	Find the difference between two dates in years, months and days.
FIMA_DAYS_AND_MONTHS_AND_YEARS	Find the difference between two dates in years, months and days.
MONTH_NAMES_GET	Get the names of the month
WEEK_GET_FIRST_DAY	Get the first day of the week
HRGPBS_HESA_DATE_FORMAT	Format the date in dd/mm/yyyy format
SD_CALC_DURATION_FROM_DATETIME	Find the difference between two date/time and report the difference in hours
L_MC_TIME_DIFFERENCE	Find the time difference between two date/time
HR_99S_INTERVAL_BETWEEN_DATES	Difference between two dates in days, weeks, months
LAST_DAY_OF_MONTHS	Returns the last day of the month
DATE_CHECK_PLAUSIBILITY	Check for the invalid date.
DATE_2D_TO_4D_CONVERSION	Year entry: 2-character to 4-character.
DAY_IN_WEEK	Input date and will give the name of the day 1-monday,2-Tuesday....
SD_DATETIME_DIFFERENCE	Give the difference in Days and Time for 2 dates

An SAP Consultant