ABAP的日期类型D,是一个8位字符串；时间类型T，是6位字符串。日期实际是一个字符串，格式；‘YYYYMMDD’，可以通过字符串截取获取年月日字符子串。
示例：使用字符串截取出年份、月份等
"日期 DATA:temp_date(8) TYPE C. temp_date = sy-datum. WRITE:/ temp_date. temp_date = temp_date+2(2). WRITE:/ temp_date.
1、判断日期是否在指定范围
示例：
WRITE:/‘测试日期是否在一个时间段中‘. DATA:date1 type d, date2 type d. date1 = ‘20181201‘. date2 = ‘20191221‘. if sy-datum > date1 and sy-datum < date2. WRITE:/ sy-datum,‘在范围内‘. else. WRITE:/ sy-datum,‘不在范围内‘. ENDIF.
2、判断日期是星期几
使用function,’DAY_IN_WEEK’判断一个日期是星期几
示例：
WRITE:‘根据日期获取日期星期几‘. DATA: wotnr type p. CALL FUNCTION ‘DAY_IN_WEEK‘ EXPORTING DATUM = sy-datum IMPORTING WOTNR = wotnr. WRITE:/ sy-datum,‘是星期‘,wotnr.
3、根据日期获取日期所在周数
使用function,’DATE_GET_WEEK’,获取日期所在周数
示例：
CALL FUNCTION ‘DATE_GET_WEEK‘ EXPORTING DATE = sy-datum IMPORTING WEEK = week
4、根据周数获取本周第一天日期
示例：
WRITE:/ ‘测试WEEK_GET_FIRST_DAY ,通过周数获取，本周第一天‘. DATA: date3 type d. CALL FUNCTION ‘WEEK_GET_FIRST_DAY‘ EXPORTING WEEK = week IMPORTING DATE = date3
5、检查日期格式是否正确
示例：
WRITE:/ ‘测试DATE_CHECK_FAILED ,检查日期是否正确‘. data: date4 type d. data: date5 type d. data: date6 type d. date4 = ‘20101231‘. "需要这种格式日期 date5 = ‘12/23/2019‘. "不能识别 date6 = ‘12312010‘. "不能识别 CALL FUNCTION ‘DATE_CHECK_PLAUSIBILITY‘ EXPORTING DATE = date6 EXCEPTIONS PLAUSIBILITY_CHECK_FAILED = 1 OTHERS = 2.
6、根据输入日期获取所在月最后一天
示例：
WRITE:/ ‘测试RP_LAST_DAY_OF_MONTHS,获取输入日期所在月最后一天日期‘. data:date7 type d. CALL FUNCTION ‘RP_LAST_DAY_OF_MONTHS‘ EXPORTING DAY_IN = sy-datum IMPORTING LAST_DAY_OF_MONTH = date7 EXCEPTIONS DAY_IN_NO_DATE = 1. * OTHERS = 2
7、将输入日期进行计算
示例：
WRITE:/‘测试RP_CALC_DATE_IN_INTERVAL ,日期加减 年，月，日 计算‘. data: date8 type d value ‘20181201‘. data: date9 type d. CALL FUNCTION ‘RP_CALC_DATE_IN_INTERVAL‘ EXPORTING DATE = date8 DAYS = 20 "天 MONTHS = 0 "月 SIGNUM = ‘-‘ "运算符号 YEARS = 1 "年 IMPORTING CALC_DATE = date9. WRITE:/ date9.
8、获取时间和日期之差
示例：
WRITE:/ ‘测试SD_DATETIME_DIFFERENCE,获取日期，和时间之间差‘. DATA:date10 type d value ‘20180911‘. data:date11 type d value ‘20180922‘. DATA:date12 type p. data:timediff type p. CALL FUNCTION ‘SD_DATETIME_DIFFERENCE‘ EXPORTING DATE1 = date10 TIME1 = ‘080000‘ "必须为 hhmmss格式 DATE2 = date11 TIME2 = ‘120000‘ IMPORTING DATEDIFF = date12 TIMEDIFF = timediff.
9、获取每个月名字
示例：
WRITE:/ ‘获取每个月的名字‘. DATA: month_name like t247 OCCURS 0 WITH HEADER LINE. CALL FUNCTION ‘MONTH_NAMES_GET‘ * EXPORTING * LANGUAGE = SY-LANGU * IMPORTING * RETURN_CODE = TABLES MONTH_NAMES = month_name.
10、获取一段时间内节日日期
示例：
WRITE:/‘获取节日表‘. DATA: holidays like iscal_day OCCURS 0 WITH HEADER LINE. DATA: valid_year_from like SCAL-YEAR. DATA: valid_year_to like SCAL-YEAR. DATA: return_code like sy-subrc. CALL FUNCTION ‘HOLIDAY_GET‘ EXPORTING HOLIDAY_CALENDAR = ‘CN‘ "获取holiday calendar id, tcode:scal FACTORY_CALENDAR = ‘CN‘ "获取工厂 calendar id ,通过tcode :SCAL DATE_FROM = ‘20180102‘ DATE_TO = ‘20181111‘ IMPORTING YEAR_OF_VALID_FROM = valid_year_from YEAR_OF_VALID_TO = valid_year_to RETURNCODE = return_code TABLES HOLIDAYS = holidays.
11、判断日期是否是假日
使用function,’HOLIDAY_CHECK_AND_GET_INFO’判断是否是假日，如果是返回值HOLIDAY_FOUND等于‘X’。
示例：
WRITE:‘判断是否是假日‘. DATA:holiday_indicator type scal-indicator. CALL FUNCTION ‘HOLIDAY_CHECK_AND_GET_INFO‘ EXPORTING DATE = ‘20181001‘ HOLIDAY_CALENDAR_ID = ‘CN‘ * WITH_HOLIDAY_ATTRIBUTES = ‘ ‘ IMPORTING HOLIDAY_FOUND = holiday_indicator.
12、获取当前年月
示例：
WRITE:/‘获取当前年份月份‘. DATA:cur_year like BKPF-GJAHR. DATA:cur_month like BKPF-MONAT. DATA:pre_year like BKPF-GJAHR. DATA:pre_month like BKPF-MONAT. CALL FUNCTION ‘GET_CURRENT_YEAR‘ EXPORTING BUKRS = ‘BV02‘ DATE = SY-DATUM IMPORTING CURRM = cur_month CURRY = cur_year PREVM = pre_month PREVY = pre_year . WRITE:/‘当前年月‘,cur_year,‘--‘,cur_month. WRITE:/‘前一年月‘,pre_year,‘--‘,pre_month.
原文：https://www.cnblogs.com/tangToms/p/11870497.html