title: How to define date in GORM
body: <p>It looks like GORM doesn't have support for DATE type, the only way to define date is through 
  time.Time :</p>
  
  <pre><code>type Header struct {
  
      Start    time.Time  `json:"period_start"`
      End      time.Time  `json:"period_end" `
      CreatedAt      time.Time `json:"created_at" sql:"DEFAULT:CURRENT_TIMESTAMP"`
      CreatedBy      string     `json:"created_by"`
      UpdatedAt      time.Time `json:"updated_at" sql:"DEFAULT:CURRENT_TIMESTAMP"`
      UpdatedBy      string     `json:"updated_by"`
  }
  
  </code></pre>
  
  <p>So created table will have TIMESTAMP as a type. Is there a way around this? I tried sql:"DATE", it didn't work</p>