(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:date)
          op: assign_op.Equal
          rhs: {(DQ (command_sub left_token:<Id.Left_Backtick '`'> child:(C {<which>} {<date>})))}
          spids: [16]
        )
      ]
    )
    (command.ShFunction
      name: daysInMonth
      body: 
        (BraceGroup
          children: [
            (command.Case
              to_match: {($ Id.VSub_Number '$1')}
              arms: [
                (case_arm
                  pat_list: [{<1>} {<3>} {<5>} {<7>} {<8>} {<10>} {<12>}]
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:dim)
                          op: assign_op.Equal
                          rhs: {<31>}
                          spids: [59]
                        )
                      ]
                    )
                  ]
                  spids: [43 57 62 -1]
                )
                (case_arm
                  pat_list: [{<4>} {<6>} {<9>} {<11>}]
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:dim)
                          op: assign_op.Equal
                          rhs: {<30>}
                          spids: [78]
                        )
                      ]
                    )
                  ]
                  spids: [68 76 81 -1]
                )
                (case_arm
                  pat_list: [{<2>}]
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:dim)
                          op: assign_op.Equal
                          rhs: {<29>}
                          spids: [88]
                        )
                      ]
                    )
                  ]
                  spids: [84 86 91 -1]
                )
                (case_arm
                  pat_list: [{<Id.Lit_Star '*'>}]
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:dim)
                          op: assign_op.Equal
                          rhs: {<-1>}
                          spids: [101]
                        )
                      ]
                    )
                  ]
                  spids: [97 99 104 -1]
                )
              ]
            )
          ]
        )
    )
    (command.ShFunction
      name: isleap
      body: 
        (BraceGroup
          children: [
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:leapyear)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (command_sub
                        left_token: <Id.Left_DollarParen '$('>
                        child: 
                          (command.Pipeline
                            children: [
                              (C {($ Id.VSub_DollarName '$date')} {<-d>} 
                                {<'12/31/'> ($ Id.VSub_Number '$1')} {<Id.Lit_Other '+'> <Id.Lit_Other '%'> <j>}
                              )
                              (C {<grep>} {<366>})
                            ]
                            negated: F
                          )
                      )
                    }
                  spids: [126]
                )
              ]
            )
          ]
        )
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: 
                    (C {<Id.Lit_LBracket '['>} {($ Id.VSub_Pound '$#')} {<-ne>} {<3>} 
                      {<Id.Lit_RBracket ']'>}
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (C {<echo>} 
              {
                (DQ <'Usage: '> 
                  (command_sub
                    left_token: <Id.Left_DollarParen '$('>
                    child: (C {<basename>} {($ Id.VSub_Number '$0')})
                  ) <' mon day year'>
                )
              }
            )
            (C {<echo>} {(DQ <'  with just numerical values (ex: 7 7 1776)'>)})
            (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<1>})
          ]
          spids: [156 170]
        )
      ]
    )
    (command.Simple
      words: [{($ Id.VSub_DollarName '$date')} {<--version>}]
      redirects: [
        (redir op:<Id.Redir_Great '>'> loc:(redir_loc.Fd fd:1) arg:{<'/dev/null'>})
        (redir op:<Id.Redir_GreatAnd '2>&'> loc:(redir_loc.Fd fd:2) arg:{<1>})
      ]
      do_fork: T
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: 
                    (C {<Id.Lit_LBracket '['>} {($ Id.VSub_QMark '$?')} {<-ne>} {<0>} 
                      {<Id.Lit_RBracket ']'>}
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.Sentence
              child: 
                (command.Simple
                  words: [
                    {<echo>}
                    {
                      (DQ <'Sorry, but '> 
                        (command_sub
                          left_token: <Id.Left_DollarParen '$('>
                          child: (C {<basename>} {($ Id.VSub_Number '$0')})
                        ) <' can\'t run without GNU date.'>
                      )
                    }
                  ]
                  redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
                  do_fork: T
                )
              terminator: <Id.Op_Semi _>
            )
            (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<1>})
          ]
          spids: [215 229]
        )
      ]
    )
    (C {<eval>} 
      {
        (command_sub
          left_token: <Id.Left_DollarParen '$('>
          child: 
            (C {($ Id.VSub_DollarName '$date')} 
              {(DQ <'+thismon=%m;thisday=%d;thisyear=%Y;dayofyear=%j'>)}
            )
        )
      }
    )
    (command.CommandList
      children: [
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:startmon)
                  op: assign_op.Equal
                  rhs: {($ Id.VSub_Number '$1')}
                  spids: [267]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.Sentence
          child: 
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:startday)
                  op: assign_op.Equal
                  rhs: {($ Id.VSub_Number '$2')}
                  spids: [271]
                )
              ]
            )
          terminator: <Id.Op_Semi _>
        )
        (command.ShAssignment
          pairs: [
            (assign_pair
              lhs: (sh_lhs_expr.Name name:startyear)
              op: assign_op.Equal
              rhs: {($ Id.VSub_Number '$3')}
              spids: [275]
            )
          ]
        )
      ]
    )
    (C {<daysInMonth>} {($ Id.VSub_DollarName '$startmon')})
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: 
                    (C {<Id.Lit_LBracket '['>} {($ Id.VSub_DollarName '$startday')} {<-lt>} {<0>} {<-o>} 
                      {($ Id.VSub_DollarName '$startday')} {<-gt>} {($ Id.VSub_DollarName '$dim')} {<Id.Lit_RBracket ']'>}
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (command.Sentence
              child: 
                (command.Simple
                  words: [
                    {<echo>}
                    {
                      (DQ <'Invalid: Month #'> ($ Id.VSub_DollarName '$startmon') <' only has '> 
                        ($ Id.VSub_DollarName '$dim') <' days.'>
                      )
                    }
                  ]
                  redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
                  do_fork: T
                )
              terminator: <Id.Op_Semi _>
            )
            (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<1>})
          ]
          spids: [287 309]
        )
      ]
    )
    (command.If
      arms: [
        (if_arm
          cond: 
            (condition.Shell
              commands: [
                (command.Sentence
                  child: 
                    (C {<Id.Lit_LBracket '['>} {($ Id.VSub_DollarName '$startmon')} {<-eq>} {<2>} {<-a>} 
                      {($ Id.VSub_DollarName '$startday')} {<-eq>} {<29>} {<Id.Lit_RBracket ']'>}
                    )
                  terminator: <Id.Op_Semi _>
                )
              ]
            )
          action: [
            (C {<isleap>} {($ Id.VSub_DollarName '$startyear')})
            (command.If
              arms: [
                (if_arm
                  cond: 
                    (condition.Shell
                      commands: [
                        (command.Sentence
                          child: 
                            (C {<Id.Lit_LBracket '['>} {<-z>} {(DQ ($ Id.VSub_DollarName '$leapyear'))} 
                              {<Id.Lit_RBracket ']'>}
                            )
                          terminator: <Id.Op_Semi _>
                        )
                      ]
                    )
                  action: [
                    (command.Simple
                      words: [
                        {<echo>}
                        {
                          (DQ ($ Id.VSub_DollarName '$startyear') 
                            <' wasn\'t a leapyear, so February only had 28 days.'>
                          )
                        }
                      ]
                      redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
                      do_fork: T
                    )
                    (command.ControlFlow
                      token: <Id.ControlFlow_Exit exit>
                      arg_word: {<1>}
                    )
                  ]
                  spids: [364 378]
                )
              ]
            )
          ]
          spids: [334 356]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:startdatefmt)
          op: assign_op.Equal
          rhs: 
            {
              (DQ ($ Id.VSub_DollarName '$startmon') <'/'> ($ Id.VSub_DollarName '$startday') <'/'> 
                ($ Id.VSub_DollarName '$startyear')
              )
            }
          spids: [420]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:calculate)
          op: assign_op.Equal
          rhs: 
            {
              (DQ 
                (word_part.ArithSub
                  anode: 
                    {<Id.Lit_Digits 10> <Id.Lit_Pound '#'> 
                      (command_sub
                        left_token: <Id.Left_DollarParen '$('>
                        child: 
                          (C {($ Id.VSub_DollarName '$date')} {<-d>} 
                            {(DQ <'12/31/'> ($ Id.VSub_DollarName '$startyear'))} {<Id.Lit_Other '+'> <Id.Lit_Other '%'> <j>}
                          )
                      )
                    }
                ) <' - '> 
                (word_part.ArithSub
                  anode: 
                    {<Id.Lit_Digits 10> <Id.Lit_Pound '#'> 
                      (command_sub
                        left_token: <Id.Left_DollarParen '$('>
                        child: 
                          (C {($ Id.VSub_DollarName '$date')} {<-d>} 
                            {($ Id.VSub_DollarName '$startdatefmt')} {<Id.Lit_Other '+'> <Id.Lit_Other '%'> <j>}
                          )
                      )
                    }
                )
              )
            }
          spids: [430]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:daysleftinyear)
          op: assign_op.Equal
          rhs: {(word_part.ArithSub anode:{($ Id.VSub_DollarName '$calculate')})}
          spids: [471]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:daysbetweenyears)
          op: assign_op.Equal
          rhs: {<0>}
          spids: [484]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:tempyear)
          op: assign_op.Equal
          rhs: 
            {
              (word_part.ArithSub
                anode: 
                  (arith_expr.Binary
                    op_id: Id.Arith_Plus
                    left: {($ Id.VSub_DollarName '$startyear')}
                    right: {<Id.Lit_Digits 1>}
                  )
              )
            }
          spids: [487]
        )
      ]
    )
    (command.WhileUntil
      keyword: <Id.KW_While while>
      cond: 
        (condition.Shell
          commands: [
            (command.Sentence
              child: 
                (C {<Id.Lit_LBracket '['>} {($ Id.VSub_DollarName '$tempyear')} {<-lt>} 
                  {($ Id.VSub_DollarName '$thisyear')} {<Id.Lit_RBracket ']'>}
                )
              terminator: <Id.Op_Semi _>
            )
          ]
        )
      body: 
        (command.DoGroup
          children: [
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:daysbetweenyears)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (word_part.ArithSub
                        anode: 
                          (arith_expr.Binary
                            op_id: Id.Arith_Plus
                            left: {($ Id.VSub_DollarName '$daysbetweenyears')}
                            right: 
                              {
                                (word_part.ArithSub
                                  anode: 
                                    {<Id.Lit_Digits 10> <Id.Lit_Pound '#'> 
                                      (command_sub
                                        left_token: <Id.Left_DollarParen '$('>
                                        child: 
                                          (C {($ Id.VSub_DollarName '$date')} {<-d>} 
                                            {(DQ <'12/31/'> ($ Id.VSub_DollarName '$tempyear'))} {<Id.Lit_Other '+'> <Id.Lit_Other '%'> <j>}
                                          )
                                      )
                                    }
                                )
                              }
                          )
                      )
                    }
                  spids: [517]
                )
              ]
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:tempyear)
                  op: assign_op.Equal
                  rhs: 
                    {
                      (word_part.ArithSub
                        anode: 
                          (arith_expr.Binary
                            op_id: Id.Arith_Plus
                            left: {($ Id.VSub_DollarName '$tempyear')}
                            right: {<Id.Lit_Digits 1>}
                          )
                      )
                    }
                  spids: [546]
                )
              ]
            )
          ]
        )
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:dayofyear)
          op: assign_op.Equal
          rhs: 
            {
              (command_sub
                left_token: <Id.Left_DollarParen '$('>
                child: (C {($ Id.VSub_DollarName '$date')} {<Id.Lit_Other '+'> <Id.Lit_Other '%'> <j>})
              )
            }
          spids: [565]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:totaldays)
          op: assign_op.Equal
          rhs: 
            {
              (word_part.ArithSub
                anode: 
                  (arith_expr.Binary
                    op_id: Id.Arith_Plus
                    left: 
                      (arith_expr.Binary
                        op_id: Id.Arith_Plus
                        left: 
                          {
                            (word_part.ArithSub
                              anode: 
                                {<Id.Lit_Digits 10> <Id.Lit_Pound '#'> 
                                  ($ Id.VSub_DollarName '$daysleftinyear')
                                }
                            )
                          }
                        right: 
                          {
                            (word_part.ArithSub
                              anode: 
                                {<Id.Lit_Digits 10> <Id.Lit_Pound '#'> 
                                  ($ Id.VSub_DollarName '$daysbetweenyears')
                                }
                            )
                          }
                      )
                    right: 
                      {
                        (word_part.ArithSub
                          anode: 
                            {<Id.Lit_Digits 10> <Id.Lit_Pound '#'> ($ Id.VSub_DollarName '$dayofyear')}
                        )
                      }
                  )
              )
            }
          spids: [582]
        )
      ]
    )
    (C {<'/bin/echo'>} {<-n>} 
      {
        (DQ ($ Id.VSub_DollarName '$totaldays') <' days have elapsed between '> 
          ($ Id.VSub_DollarName '$startmon') <'/'> ($ Id.VSub_DollarName '$startday') <'/'> ($ Id.VSub_DollarName '$startyear') <' '>
        )
      }
    )
    (C {<echo>} 
      {
        (DQ <'and today, day '> ($ Id.VSub_DollarName '$dayofyear') <' of '> 
          ($ Id.VSub_DollarName '$thisyear') <.>
        )
      }
    )
    (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<0>})
  ]
)