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This is a 4-digit numeric variable.

Codes

9997 = Don't know
9999 = NIU (not in universe)

Description

This variable records the man's date of first marriage as reported in century-month codes (CMC).

Century month codes (CMC) are particularly useful for checking the consistency of dates, calculating intervals between events, and imputing dates when the information for an event is missing or partially complete.

Century month codes (CMC) are calculated by multiplying by 12 the difference between the year of an event and 1900.

The month of the event is added to the previous result.

CMC = (Year minus 1900) * 12 + Month

For example, the CMC for June 2002 is:

CMC = (2002 minus1900) * 12 + 6 = 1230

In other words, 1,230 months have elapsed between January 1900 and June 2002. Starting with CMC figures, one can calculate the month and year using the following formulas:

Year = int( ( CMC minus 1 )/12 ) + 1900
[int(x) is the integer part of x]
Month = CMC - ( ( Year minus 1900 ) * 12 )

Comparability

There are differences across samples in the age universe of respondents.

The Thailand 2015 (Bangkok) and Nepal 2019 surveys used a non-standard calendar; these have been converted by IPUMS to be compatible with the other surveys in DOMMN.

Universe

No universe descriptions are currently available.

Availability

This variable is not available for the currently selected unit of analysis.