Please help with one trade per day code

It is possible when coded the way within the EA

1. For a new bar test, Bars is unreliable (a refresh/reconnect can change number of bars on chart), volume is unreliable (miss ticks), Price is unreliable (duplicate prices and The == operand. - MQL4 programming forum.) Always use time.
             New candle - MQL4 programming forum #3 2014.04.04

   I disagree with making a new bar function, because it can only be called once per tick. A variable can be tested multiple times.
             Running EA once at the start of each bar - MQL4 programming forum 2011.05.06

2. For a new day just substitute date for time.

   void OnTick(){
      static datetime curDate=0; datetime preDate=curDate; curDate=date(); if(curDate != preDate) OnNewDay();
      ⋮

             Find bar of the same time one day ago - MQL4 programming forum 2017.10.06

3. You could also use D1 timeframe, but then you have to deal with 4066/synchronization issue.