Reads a value in the form a week-number within a
year and returns a SAS date value using the V algorithm.

Category: | Date and Time |

The WEEKVw. informat reads the week-number value within
a year. If the input does not contain a year expression, WEEKVw. uses the current year as the year expression,
which is the default. If the input does not contain a day expression,
WEEKVw. uses the first day
of the week as the day expression, which is the default.

The V algorithm calculates
the SAS date value. The number-of-week value is represented as a decimal
number in the range 01–53, with a leading zero and maximum
value of 53. Weeks begin on a Monday and week 1 of the year is the
week that includes both January 4th and the first Thursday of the
year. If the first Monday of January is the 2nd, 3rd, or 4th, the
preceding days are part of the last week of the preceding year. For
example, the fifth week of the year would be represented as 06.

The WEEKVw. informat reads the week-number value as a
decimal number in the range 01–53, with Monday as the first
day of the week. Week one of the year is the week that includes both
January fourth and the first Thursday of the year. If the first Monday
of January is the second, third, or fourth, the preceding days are
part of the last week of the preceding year.

Functions:

WEEK Function in SAS Functions and CALL Routines: Reference