This variable is not available for any of the currently selected samples.
BIRTHYEARMN_AF (MV010_AF) reports the man's year of birth, according to the Solar Hijri calendar. This variable is country-specific to Afghanistan.
BIRTHYEARMN_AF (MV010_AF) has no comparability problems.
All standard date variables in Afghanistan DHS samples are given in the Solar Hijri calendar. The Solar Hijri calendar year consists of 12 months of 29 to 31 days. The first 6 months (Hamal through Sonbola) each contain 31 days, the following 5 months (Mizan through Dalvae) each contain 30 days, and the last month (Hut) contains 29 days (30 in a leap year). The Solar Hijri calendar begins on the March equinox, which usually falls around March 21 in the Gregorian calendar. In general, the Solar Hijri calendar is 621 or 622 years behind the Gregorian calendar.
Comparability - Standard DHS
The question about month and year of birth is included and consistent across all phases of the standard DHS questionnaire for Afghanistan.