diff --git a/all.sas b/all.sas
index e8a1427..b02ecc0 100644
--- a/all.sas
+++ b/all.sas
@@ -369,6 +369,48 @@ https://github.com/yabwon/SAS_PACKAGES/blob/main/packages/baseplus.md#functionex
 %mend mf_existvarlist;
 
 /** @endcond *//**
+  @file
+  @brief Returns E8601DT26.6 if compatible else DATETIME19.3
+  @details From our experience in [Data Controller for SAS]
+  (https://datacontroller.io) deployments, the E8601DT26.6 datetime format has
+  the widest support when it comes to pass-through SQL queries.
+
+  However, it is not supported in WPS or early versions of SAS 9 (M3 and below)
+  when used as a datetime literal, eg:
+
+      data _null_;
+        demo="%sysfunc(datetime(),E8601DT26.6)"dt;
+        demo=;
+      run;
+
+  This macro will therefore return DATEITME19.3 as an alternative format
+  based on the runtime environment so that it can be used in such cases, eg:
+
+      data _null_;
+        demo="%sysfunc(datetime(),%mf_fmtdttm())"dt;
+        demo=;
+      run;
+
+  <h4> Related Macros </h4>
+  @li mf_fmtdttm.test.sas
+
+  @author Allan Bowe
+**/
+
+%macro mf_fmtdttm(
+)/*/STORE SOURCE*/;
+
+%if "&sysver"="9.2" or "&sysver"="9.3"
+  or ("&sysver"="9.4" and "%substr(&SYSVLONG,9,1)" le "3")
+  or "%substr(&sysver,1,1)"="4"
+  or "%substr(&sysver,1,1)"="5"
+%then %do;DATETIME19.3%end;
+%else %do;E8601DT26.6%end;
+
+%mend mf_fmtdttm;
+
+
+/**
   @file
   @brief Returns the appLoc from the _program variable
   @details When working with SASjs apps, web services / tests / jobs are always
@@ -9259,6 +9301,7 @@ options ibufsize=&ibufsize;
   @param [in] loop_secs= (1) Seconds to wait between each lock attempt
 
   <h4> SAS Macros </h4>
+  @li mf_fmtdttm.sas
   @li mp_abort.sas
   @li mp_lockfilecheck.sas
   @li mf_getuser.sas
@@ -9348,7 +9391,7 @@ run;
       LOCK_LIB ="&lib";
       LOCK_DS="&ds";
       LOCK_STATUS_CD='LOCKED';
-      LOCK_START_DTTM="%sysfunc(datetime(),E8601DT26.6)"dt;
+      LOCK_START_DTTM="%sysfunc(datetime(),%mf_fmtdttm())"dt;
       LOCK_USER_NM="&user";
       LOCK_PID="&sysjobid";
       LOCK_REF="&ref";
@@ -9368,7 +9411,7 @@ run;
     proc sql;
     update &ctl_ds
       set LOCK_STATUS_CD='LOCKED'
-        , LOCK_START_DTTM="%sysfunc(datetime(),E8601DT26.6)"dt
+        , LOCK_START_DTTM="%sysfunc(datetime(),%mf_fmtdttm())"dt
         , LOCK_USER_NM="&user"
         , LOCK_PID="&sysjobid"
         , LOCK_REF="&ref"
@@ -9443,7 +9486,7 @@ run;
     proc sql;
     update &ctl_ds
       set LOCK_STATUS_CD='UNLOCKED'
-        , LOCK_END_DTTM="%sysfunc(datetime(),E8601DT26.6)"dt
+        , LOCK_END_DTTM="%sysfunc(datetime(),%mf_fmtdttm())"dt
         , LOCK_USER_NM="&user"
         , LOCK_PID="&sysjobid"
         , LOCK_REF="&ref"
@@ -10232,6 +10275,7 @@ run;
 
   <h4> SAS Macros </h4>
   @li mf_existvar.sas
+  @li mf_fmtdttm.sas
   @li mf_getquotedstr.sas
   @li mf_getuniquename.sas
   @li mf_nobs.sas
@@ -10391,12 +10435,12 @@ quit;
     set keytable="&base_libds"
       ,keycolumn="&retained_key"
       ,max_key=%eval(&maxkey+&newkey_cnt)
-      ,processed_dttm="%sysfunc(datetime(),E8601DT26.6)"dt;
+      ,processed_dttm="%sysfunc(datetime(),%mf_fmtdttm())"dt;
   %end;
   %else %do;
   update &maxkeytable
     set max_key=%eval(&maxkey+&newkey_cnt)
-      ,processed_dttm="%sysfunc(datetime(),E8601DT26.6)"dt
+      ,processed_dttm="%sysfunc(datetime(),%mf_fmtdttm())"dt
     where keytable="&base_libds";
   %end;
   %mp_lockanytable(UNLOCK