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When a date or time is imputed, it is required that the variable containing the imputed value be accompanied by a date or time imputation flag variable. The variable fragments to be used for these variables are DTF and TMF, as defined in ADaMIG Table 3.1.5.1 (https://www.cdisc.org/standards/foundational/adam/). DF and TF can be used as abbreviated forms of DTF and TMF, respectively, when the use of DTF or TMF would create a variable name longer than 8 characters. These additional imputation flag variables are conditionally required. The root, identified by "*", of the names of each pair of variables, *DT and *DTF (or *DF), should be identical. The same is true for the corresponding time and imputation flag variables *TM and *TMF (or *TF). Thus it is good practice to limit roots to 5 characters in length.

Section 3 2.9.5.6 Predefined Standard Variables for ADSL contains sets of timing variables which share a common prefix, such as TRTSDT, TRTSTM, and TRTSDTM. It should be noted that in many instances in Section 3  2.9.5.6 Predefined Standard Variables for ADSL, specific DTF and TMF flags are defined within sets of timing variables. However, imputation flags should be created for all date or time variables when imputation has been performed, even if there is not a specific imputation flag variable mentioned in Section 3  2.9.5.6 Predefined Standard Variables for ADSL. For example, the imputation flag variable has not been listed for EOSDT, but EOSDTF must be present if date imputation was performed.

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