Docs, changelog and tests

Changelog.md

@@ -3,6 +3,7 @@
 Breaking changes:
  * Type Checker: Disallow virtual for library functions.
  * Deprecated dot syntax for `value` and `gas`.
+ * Deprecated the identifier `now`.
 
 Language Features:
 

docs/cheatsheet.rst

@@ -67,7 +67,7 @@ The following is the order of precedence for operators, listed in order of evalu
 | *15*       | Comma operator                      | ``,``                                      |
 +------------+-------------------------------------+--------------------------------------------+
 
-.. index:: assert, block, coinbase, difficulty, number, block;number, timestamp, block;timestamp, msg, data, gas, sender, value, now, gas price, origin, revert, require, keccak256, ripemd160, sha256, ecrecover, addmod, mulmod, cryptography, this, super, selfdestruct, balance, send
+.. index:: assert, block, coinbase, difficulty, number, block;number, timestamp, block;timestamp, msg, data, gas, sender, value, gas price, origin, revert, require, keccak256, ripemd160, sha256, ecrecover, addmod, mulmod, cryptography, this, super, selfdestruct, balance, send
 
 Global Variables
 ================
@@ -91,7 +91,6 @@ Global Variables
 - ``msg.data`` (``bytes``): complete calldata
 - ``msg.sender`` (``address payable``): sender of the message (current call)
 - ``msg.value`` (``uint``): number of wei sent with the message
-- ``now`` (``uint``): current block timestamp (alias for ``block.timestamp``)
 - ``tx.gasprice`` (``uint``): gas price of the transaction
 - ``tx.origin`` (``address payable``): sender of the transaction (full call chain)
 - ``assert(bool condition)``: abort execution and revert state changes if condition is ``false`` (use for internal error)
@@ -124,7 +123,7 @@ Global Variables
 - ``type(I).interfaceId`` (``bytes4``): value containing the EIP-165 interface identifier of the given interface, see :ref:`Type Information<meta-type>`.
 
 .. note::
-    Do not rely on ``block.timestamp``, ``now`` and ``blockhash`` as a source of randomness,
+    Do not rely on ``block.timestamp`` or ``blockhash`` as a source of randomness,
     unless you know what you are doing.
 
     Both the timestamp and the block hash can be influenced by miners to some degree.
@@ -144,6 +143,8 @@ Global Variables
     In version 0.5.0, the following aliases were removed: ``suicide`` as alias for ``selfdestruct``,
     ``msg.gas`` as alias for ``gasleft``, ``block.blockhash`` as alias for ``blockhash`` and
     ``sha3`` as alias for ``keccak256``.
+.. note::
+    In version 0.7.0, the alias ``now`` (for ``block.timestamp``) was removed.
 
 .. index:: visibility, public, private, external, internal
 

docs/contracts/constant-state-variables.rst

@@ -44,7 +44,7 @@ Constant
 
 For ``constant`` variables, the value has to be a constant at compile time and it has to be
 assigned where the variable is declared. Any expression
-that accesses storage, blockchain data (e.g. ``now``, ``address(this).balance`` or
+that accesses storage, blockchain data (e.g. ``block.timestamp``, ``address(this).balance`` or
 ``block.number``) or
 execution data (``msg.value`` or ``gasleft()``) or makes calls to external contracts is disallowed. Expressions
 that might have a side-effect on memory allocation are allowed, but those that

docs/contracts/functions.rst

@@ -146,7 +146,7 @@ The following statements are considered modifying the state:
 
     contract C {
         function f(uint a, uint b) public view returns (uint) {
-            return a * (b + 42) + now;
+            return a * (b + 42) + block.timestamp;
         }
     }
 

docs/examples/blind-auction.rst

@@ -61,7 +61,7 @@ to receive their money - contracts cannot activate themselves.
             address payable _beneficiary
         ) public {
             beneficiary = _beneficiary;
-            auctionEndTime = now + _biddingTime;
+            auctionEndTime = block.timestamp + _biddingTime;
         }
 
         /// Bid on the auction with the value sent
@@ -78,7 +78,7 @@ to receive their money - contracts cannot activate themselves.
             // Revert the call if the bidding
             // period is over.
             require(
-                now <= auctionEndTime,
+                block.timestamp <= auctionEndTime,
                 "Auction already ended."
             );
 
@@ -140,7 +140,7 @@ to receive their money - contracts cannot activate themselves.
             // external contracts.
 
             // 1. Conditions
-            require(now >= auctionEndTime, "Auction not yet ended.");
+            require(block.timestamp >= auctionEndTime, "Auction not yet ended.");
             require(!ended, "auctionEnd has already been called.");
 
             // 2. Effects
@@ -211,8 +211,8 @@ invalid bids.
         /// functions. `onlyBefore` is applied to `bid` below:
         /// The new function body is the modifier's body where
         /// `_` is replaced by the old function body.
-        modifier onlyBefore(uint _time) { require(now < _time); _; }
-        modifier onlyAfter(uint _time) { require(now > _time); _; }
+        modifier onlyBefore(uint _time) { require(block.timestamp < _time); _; }
+        modifier onlyAfter(uint _time) { require(block.timestamp > _time); _; }
 
         constructor(
             uint _biddingTime,
@@ -220,7 +220,7 @@ invalid bids.
             address payable _beneficiary
         ) public {
             beneficiary = _beneficiary;
-            biddingEnd = now + _biddingTime;
+            biddingEnd = block.timestamp + _biddingTime;
             revealEnd = biddingEnd + _revealTime;
         }
 
@@ -326,4 +326,4 @@ invalid bids.
             highestBidder = bidder;
             return true;
         }
-    }
+    }

docs/examples/micropayment.rst

@@ -351,7 +351,7 @@ The full contract
         {
             sender = msg.sender;
             recipient = _recipient;
-            expiration = now + duration;
+            expiration = block.timestamp + duration;
         }
 
         /// the recipient can close the channel at any time by presenting a
@@ -376,7 +376,7 @@ The full contract
         /// if the timeout is reached without the recipient closing the channel,
         /// then the Ether is released back to the sender.
         function claimTimeout() public {
-            require(now >= expiration);
+            require(block.timestamp >= expiration);
             selfdestruct(sender);
         }
 

docs/units-and-global-variables.rst

@@ -47,7 +47,7 @@ These suffixes cannot be applied to variables. For example, if you want to
 interpret a function parameter in days, you can in the following way::
 
     function f(uint start, uint daysAfter) public {
-        if (now >= start + daysAfter * 1 days) {
+        if (block.timestamp >= start + daysAfter * 1 days) {
           // ...
         }
     }
@@ -61,7 +61,7 @@ There are special variables and functions which always exist in the global
 namespace and are mainly used to provide information about the blockchain
 or are general-use utility functions.
 
-.. index:: abi, block, coinbase, difficulty, encode, number, block;number, timestamp, block;timestamp, msg, data, gas, sender, value, now, gas price, origin
+.. index:: abi, block, coinbase, difficulty, encode, number, block;number, timestamp, block;timestamp, msg, data, gas, sender, value, gas price, origin
 
 
 Block and Transaction Properties
@@ -78,7 +78,6 @@ Block and Transaction Properties
 - ``msg.sender`` (``address payable``): sender of the message (current call)
 - ``msg.sig`` (``bytes4``): first four bytes of the calldata (i.e. function identifier)
 - ``msg.value`` (``uint``): number of wei sent with the message
-- ``now`` (``uint``): current block timestamp (alias for ``block.timestamp``)
 - ``tx.gasprice`` (``uint``): gas price of the transaction
 - ``tx.origin`` (``address payable``): sender of the transaction (full call chain)
 
@@ -88,7 +87,7 @@ Block and Transaction Properties
     This includes calls to library functions.
 
 .. note::
-    Do not rely on ``block.timestamp``, ``now`` and ``blockhash`` as a source of randomness,
+    Do not rely on ``block.timestamp`` or ``blockhash`` as a source of randomness,
     unless you know what you are doing.
 
     Both the timestamp and the block hash can be influenced by miners to some degree.
@@ -327,4 +326,3 @@ for an interface type ``I``:
     A ``bytes4`` value containing the `EIP-165 <https://eips.ethereum.org/EIPS/eip-165>`_
     interface identifier of the given interface ``I``. This identifier is defined as the ``XOR`` of all
     function selectors defined within the interface itself - excluding all inherited functions.
-

test/compilationTests/MultiSigWallet/MultiSigWalletWithDailyLimit.sol

@@ -69,8 +69,8 @@ contract MultiSigWalletWithDailyLimit is MultiSigWallet {
         internal
         returns (bool)
     {
-        if (now > lastDay + 24 hours) {
-            lastDay = now;
+        if (block.timestamp > lastDay + 24 hours) {
+            lastDay = block.timestamp;
             spentToday = 0;
         }
         if (spentToday + amount > dailyLimit || spentToday + amount < spentToday)
@@ -88,7 +88,7 @@ contract MultiSigWalletWithDailyLimit is MultiSigWallet {
         view
         returns (uint)
     {
-        if (now > lastDay + 24 hours)
+        if (block.timestamp > lastDay + 24 hours)
             return dailyLimit;
         if (dailyLimit < spentToday)
             return 0;

test/libsolidity/syntaxTests/globalFunctions/now_deprecate.sol

@@ -0,0 +1,7 @@
+contract C {
+	function f() public {
+		now;
+	}
+}
+// ----
+// TypeError: (38-41): "now" has been deprecated. Use "block.timestamp" instead.

test/libsolidity/syntaxTests/globalFunctions/now_override.sol

@@ -0,0 +1,8 @@
+contract C {
+	function f() public view {
+		uint now = block.timestamp;
+		now;
+	}
+}
+// ----
+// Warning: (43-51): This declaration shadows a builtin symbol.

test/libsolidity/syntaxTests/viewPureChecker/smoke_test.sol

@@ -1,7 +1,7 @@
 contract C {
     uint x;
     function g() pure public {}
-    function f() view public returns (uint) { return now; }
+    function f() view public returns (uint) { return block.timestamp; }
     function h() public { x = 2; }
     function i() payable public { x = 2; }
 }