what_did_they_DO

evdate_t decode_date(evdate_t param_1)

{
  uint uVar1;
  ushort uVar2;
  undefined uVar3;
  int iVar4;
  undefined uVar5;
  evdate_t local_18;
  undefined4 local_14;

  local_18 = param_1;
  if ((int)param_1 >> 0x18 == 50) {
    local_18 = (evdate_t)((uint)param_1 & 0xffffff | (uint)DAT_80160f21 << 0x18);
  }
  iVar4 = (int)local_18 >> 0x18;
  if (((int)local_18 << 8) >> 0x18 == 99) {
    uVar1 = FUN_80088a84(iVar4);
    local_18 = (evdate_t)((uint)local_18 & 0xff00ffff | (uVar1 & 0xff) << 0x10);
    iVar4 = (int)local_18 >> 0x18;
  }
  if (99 < iVar4) {
    local_18 = (evdate_t)((uint)local_18 & 0xffff | (uint)*(ushort *)(&DAT_8015fc44 + (iVar4 + -100) * 2) << 0x10);
  }
  if (((uint)local_18 & 0x20) != 0) {
    local_18 = (evdate_t)((uint)local_18 & 0xffffff00 | (uint)*(byte *)(((uint)local_18 & 0x1f) * 2 + -0x7fea03bb) | (uint)local_18 & 0xc0);
  }
  if ((int)local_18 >> 0x18 < 0x50) goto LAB_8008a3b4;
  local_18 = (evdate_t)((uint)local_18 & 0xffffff | (((int)local_18 >> 0x18) + -0x50) * 0x1000000);
  if ((int)local_18 >> 0x18 < 0xd) {
    uVar2 = FUN_80088a38(&local_18);
    local_18 = (evdate_t)((uint)local_18 & 0xffff | (uint)uVar2 << 0x10);
    goto LAB_8008a3b4;
  }
  local_14 = local_14 & 0xffff | 0x1010000;
  uVar2 = FUN_80088a38(&local_14);
  uVar1 = (uint)uVar2 << 0x10;
  local_14 = local_14 & 0xffff | uVar1;
  local_14._1_1_ = (char)uVar2;
  if (local_18.day == 30) {
    uVar3 = 0x1f;
    if (uVar2 != 0x201) {
      local_18 = (evdate_t)(uVar1 & 0xff000000 | (uint)CONCAT12(local_14._1_1_ + -1,local_18._2_2_));
      goto LAB_8008a3b4;
    }
    uVar5 = 1;
  }
  else {
    if (local_18.day == 0x1d) {
      if (uVar2 == 0x202) {
        local_18._1_3_ = CONCAT12(0x1f,local_18._2_2_);
        local_18 = (evdate_t)CONCAT13(1,local_18._1_3_);
      }
      else if (uVar2 == 0x201) {
        local_18._1_3_ = CONCAT12(30,local_18._2_2_);
        local_18 = (evdate_t)CONCAT13(1,local_18._1_3_);
      }
      else {
        local_18 = (evdate_t)(uVar1 & 0xff000000 | (uint)CONCAT12(local_14._1_1_ + -2,local_18._2_2_));
      }
      goto LAB_8008a3b4;
    }
    if (local_18.day != 0x19) goto LAB_8008a3b4;
    if (uVar2 == 0x205) {
      uVar3 = 0x1f;
      uVar5 = 1;
    }
    else {
      if (uVar2 == 0x204) {
        uVar3 = 1;
LAB_8008a354:
        local_18._1_3_ = CONCAT12(30,local_18._2_2_);
        local_18 = (evdate_t)CONCAT13(uVar3,local_18._1_3_);
        goto LAB_8008a3b4;
      }
      if (uVar2 == 0x203) {
        uVar3 = 1;
LAB_8008a36c:
        local_18._1_3_ = CONCAT12(0x1d,local_18._2_2_);
        local_18 = (evdate_t)CONCAT13(uVar3,local_18._1_3_);
        goto LAB_8008a3b4;
      }
      if (uVar2 == 0x202) {
        uVar3 = 0x1c;
        uVar5 = 1;
      }
      else if (uVar2 == 0x201) {
        uVar3 = 0x1b;
        uVar5 = 1;
      }
      else {
        if (uVar2 == 0x105) {
          uVar3 = 0x1f;
        }
        else {
          if (uVar2 == 0x104) {
            uVar3 = 0xc;
            goto LAB_8008a354;
          }
          if (uVar2 == 0x103) {
            uVar3 = 0xc;
            goto LAB_8008a36c;
          }
          if (uVar2 == 0x102) {
            uVar3 = 0x1c;
          }
          else {
            uVar3 = 0x1b;
            if (uVar2 != 0x101) {
              local_18 = (evdate_t)(uVar1 & 0xff000000 | (uint)CONCAT12(local_14._1_1_ + -5,local_18._2_2_));
              goto LAB_8008a3b4;
            }
          }
        }
        uVar5 = 0xc;
      }
    }
  }
  local_18._1_3_ = CONCAT12(uVar3,local_18._2_2_);
  local_18 = (evdate_t)CONCAT13(uVar5,local_18._1_3_);
LAB_8008a3b4:
  iVar4 = ((uint)local_18 >> 0x10) << 0x18;
  if (iVar4 < 0) {
    uVar3 = FUN_80088f78((int)local_18.month,iVar4 >> 0x18);
    local_18._1_3_ = CONCAT12(uVar3,local_18._2_2_);
    local_18 = (evdate_t)((uint)local_18 & 0xff000000 | (uint)local_18._1_3_);
  }
  return local_18;
}