Codes and Frequencies
BIRTHYEAR_NP (V010) reports the woman's year of birth according to the Nepali calendar.
Apart from universe differences, BIRTHYEAR_NP (V010) has no comparability problems across Nepali samples.
All standard date variables in Nepal DHS samples are given in the Nepali calendar. The Nepali calendar, or Vikram Samvat, is a lunar calendar consisting of 12 months of 29 to 32 days each. According to the Gregorian calendar, the Nepali calendar begins in mid-April. Because the 12 months do not match the sidereal year, correctional months are occasionally added or subtracted. It is only possible to convert dates given in Vikram Samvat to the Gregorian calendar when the exact date (day, month and year) is available. Otherwise, it is only possible to approximate to the month. Vikram Samvat is approximately 56 years, 8 months, and 15 days ahead of the Gregorian calendar.
Comparability - Standard DHS
BIRTHYEAR_NP (V010) is included in every phase of the standard DHS questionnaire for Nepal.
- Nepal 1996: Ever-married women age 15-49.
- Nepal 2001: Ever-married women age 15-49.
- Nepal 2006: All women age 15-49.
- Nepal 2011: All women age 15-49.
- Nepal 2016: All women age 15-49.