It's the first time I come here so I hope my question won't be too bad. I'm trying to pick the data from last day, last week and last month that are stored in a mongo collection.
So actually I did:

  if(period.includes("daily")){
    //search for 24h before now
    DockerStatsToKeep.find({
      read: { "$gte": moment(new Date()).subtract(86400, 'second').unix()}
    });
  }else if (period.includes("weekly")) {
    //search for 168h before now (7days)
    DockerStatsToKeep.find({
      read: { "$gte": moment(new Date()).subtract(604800, 'second').unix()}
    });
  }else if (period.includes("monthly")) {
    //search for last month 
    DockerStatsToKeep.find({
      read: { "$gte": moment(new Date()).subtract(xx, 'second').unix()}
    });
  }else{
    console.error("this is not a valid period format, please use 'daily, weekly or monthly'");
  }

But I'm stuck for the last month and I can't find a way to do it. Because month are sometimes 30days or 31days or 29days