diff --git a/garecovery/clargs.py b/garecovery/clargs.py
index 90279b9..9513e95 100644
--- a/garecovery/clargs.py
+++ b/garecovery/clargs.py
@@ -7,7 +7,8 @@
 
 # Define GreenAddress_T0 as the earliest possible GreenAddress UTXO
 # This is used as the default value for scanning the blockchain
-GreenAddress_T0 = "28 Feb 2014"
+# 28 Feb 2014
+GreenAddress_T0 = 1393545600
 
 # Some defaults here make it easier for tests to override them
 DEFAULT_SCAN_FROM = GreenAddress_T0
@@ -147,9 +148,10 @@ def get_args(argv):
         help='When scanning for 2of3 transactions search this number of keys')
     advanced_2of3.add_argument(
         '--scan-from',
+        type=int,
         dest='scan_from',
         default=DEFAULT_SCAN_FROM,
-        help='Start scanning the blockchain for transactions from this date/time. '
+        help='Start scanning the blockchain for transactions from this timestamp. '
              'Scanning the blockchain is slow so if you know your transactions were all after '
              'a certain date you can speed it up by restricting the search range with this '
              'option. Defaults to the inception time of GreenAddress. Pass 0 to scan the entire '
diff --git a/garecovery/two_of_three.py b/garecovery/two_of_three.py
index ae13e12..7b1515a 100644
--- a/garecovery/two_of_three.py
+++ b/garecovery/two_of_three.py
@@ -1,4 +1,3 @@
-import dateparser
 import decimal
 import io
 import logging
@@ -308,13 +307,7 @@ def scan_blockchain(self, keysets):
         logging.debug("Connecting to bitcoinrpc to scan blockchain")
         core = bitcoincore.Connection(clargs.args)
 
-        # Convert human-friendly datetime scan_from to utc timestamp
-        if clargs.args.scan_from == '0':
-            scan_from_timestamp = 0
-        else:
-            scan_from = dateparser.parse(clargs.args.scan_from)
-            scan_from_timestamp = int(time.mktime(scan_from.timetuple()))
-        logging.info("Scanning from '{}' = {}".format(clargs.args.scan_from, scan_from_timestamp))
+        logging.info("Scanning from '{}'".format(clargs.args.scan_from))
         logging.warning('This step may take 10 minutes or more')
 
         # Need to import our keysets into core so that it will recognise the
@@ -326,7 +319,7 @@ def scan_blockchain(self, keysets):
                 addresses.append(witness.address)
                 requests.append({
                     'scriptPubKey': {"address": witness.address},
-                    'timestamp': scan_from_timestamp,
+                    'timestamp': clargs.args.scan_from,
                     'watchonly': True,
                 })
         logging.info('Importing {} derived addresses into bitcoind'.format(len(requests)))
diff --git a/tools/requirements.txt b/tools/requirements.txt
index 3e89d8e..d4048e9 100644
--- a/tools/requirements.txt
+++ b/tools/requirements.txt
@@ -1,6 +1,5 @@
 argcomplete==1.8.2 --hash=sha256:c2a0a88492c31a42dde41636fbd4c406cde78fe7fb938ab511b733bff6358782
 coverage==4.4.1 --hash=sha256:381be5d31d3f0d912334cf2c159bc7bea6bfe6b0e3df6061a3bf2bf88359b1f6 --hash=sha256:700040c354f0230287906b1276635552a3def4b646e0145555bc9e2e5da9e365 --hash=sha256:0f1883eab9c19aa243f51308751b8a2a547b9b817b721cc0ecf3efb99fafbea7 --hash=sha256:c820a533a943ebc860acc0ce6a00dd36e0fdf2c6f619ff8225755169428c5fa2 --hash=sha256:7a9c44400ee0f3b4546066e0710e1250fd75831adc02ab99dda176ad8726f424
-dateparser==0.6.0 --hash=sha256:e2629d2f8361722c6047138ca085256c9f2cf5cc657fd66122aa0564afa4dc33
 funcsigs==1.0.2 --hash=sha256:330cc27ccbf7f1e992e69fef78261dc7c6569012cf397db8d3de0234e6c937ca
 mock==2.0.0 --hash=sha256:5ce3c71c5545b472da17b72268978914d0252980348636840bd34a00b5cc96c1
 pbr==3.1.1 --hash=sha256:60c25b7dfd054ef9bb0ae327af949dd4676aa09ac3a9471cdc871d8a9213f9ac
@@ -10,15 +9,9 @@ pycoin==0.77 --hash=sha256:c5e2fe86690e72b63000f4cf363851116cb7b96e8eb77b69b710e
 pytest==3.1.3 --hash=sha256:2a4f483468954621fcc8f74784f3b42531e5b5008d49fc609b37bc4dbc6dead1
 pytest-cov==2.5.1 --hash=sha256:890fe5565400902b0c78b5357004aab1c814115894f4f21370e2433256a3eeec
 python-bitcoinrpc==1.0 --hash=sha256:a6a6f35672635163bc491c25fe29520bdd063dedbeda3b37bf5be97aa038c6e7
-python-dateutil==2.6.1 --hash=sha256:95511bae634d69bc7329ba55e646499a842bc4ec342ad54a8cdb65645a0aad3c
-pytz==2017.2 --hash=sha256:d1d6729c85acea5423671382868627129432fba9a89ecbb248d8d1c7a9f01c67
-regex==2017.7.26 --hash=sha256:b0e0c1c80e677ee351d14bdb0345c33caab6acdbaf3a41c3f34c09bbb68c8897
-ruamel.ordereddict==0.4.13; python_version <= '2.7' --hash=sha256:45541836cbfdde630033cae7bbbe35acbac87a0ceec79f944b7a3bedd940fe78 --hash=sha256:bf0a198c8ce5d973c24e5dba12d3abc254996788ca6ad8448eabc6aa710db149
-ruamel.yaml==0.15.22 --hash=sha256:136a1f53a9e860f931b11bbec2b0288b510e419fea030c8780a9ec3727a07176 --hash=sha256:c7754abb5face9ccb52308cb9c42f96c37af74ba2bf074d69c7895c5e2357744 --hash=sha256:63247356595fdecc27f2fc517e370d1f2a911fbc58ca544ee93f13337311d017
 setuptools-git==1.2 --hash=sha256:e7764dccce7d97b4b5a330d7b966aac6f9ac026385743fd6cedad553f2494cfa
 setuptools-pep8==0.9.0 --hash=sha256:f620cd7494015729249bda7260c9b94900d6e6ab27df46051fb144c32627080c
 six==1.10.0 --hash=sha256:0ff78c403d9bccf5a425a6d31a12aa6b47f1c21ca4dc2573a7e2f32a97335eb1
-tzlocal==1.4 --hash=sha256:05a2908f7fb1ba8843f03b2360d6ad314dbf2bce4644feb702ccd38527e13059
 
 https://github.com/ElementsProject/libwally-core/releases/download/release_0.4.0/wallycore-0.4.0-cp27-cp27mu-linux_x86_64.whl; 'linux' in sys_platform and python_version == '2.7' and platform_machine == 'x86_64' --hash=sha256:d692be12dbfc2447a92028784a166b1c60162c59ecd1059a886b7a45ab4eae00
 https://github.com/ElementsProject/libwally-core/releases/download/release_0.4.0/wallycore-0.4.0-cp35-cp35m-linux_x86_64.whl; 'linux' in sys_platform and python_version == '3.5' and platform_machine == 'x86_64' --hash=sha256:58726a4c1cda61191376f99753ed79445bc31408eca4d83b4156795885c5c6d2