util: generalize and simplify time::{to,from}UnixTimestamp()

Change-Id: I1dc94365944b8efc03f32919d32d5df0a652b672
diff --git a/tests/unit/util/time.t.cpp b/tests/unit/util/time.t.cpp
index 9004700..84236d2 100644
--- a/tests/unit/util/time.t.cpp
+++ b/tests/unit/util/time.t.cpp
@@ -88,15 +88,18 @@
 
   BOOST_TEST(value > referenceTime);
 
-  BOOST_CHECK_EQUAL(toIsoString(referenceTime), "20140129T034247.032000");
-  BOOST_CHECK_EQUAL(toIsoExtendedString(referenceTime), "2014-01-29T03:42:47.032000");
-  BOOST_CHECK_EQUAL(toString(referenceTime), "2014-01-29 03:42:47");
+  BOOST_TEST(toUnixTimestamp(referenceTime) == 1390966967032_ms);
+  BOOST_TEST(toUnixTimestamp<nanoseconds>(referenceTime) == 1390966967032000000_ns);
+  BOOST_TEST(toUnixTimestamp<seconds>(referenceTime) == 1390966967_s);
+
+  BOOST_TEST(toIsoString(referenceTime) == "20140129T034247.032000");
+  BOOST_TEST(toIsoExtendedString(referenceTime) == "2014-01-29T03:42:47.032000");
+  BOOST_TEST(toString(referenceTime) == "2014-01-29 03:42:47");
 
   // Unfortunately, not all systems has lv_LV locale installed :(
-  // BOOST_CHECK_EQUAL(toString(referenceTime, "%Y. gada %d. %B", std::locale("lv_LV.UTF-8")),
-  //                   "2014. gada 29. Janvāris");
-  BOOST_CHECK_EQUAL(toString(referenceTime, "%Y -- %d -- %B", std::locale("C")),
-                    "2014 -- 29 -- January");
+  // BOOST_TEST(toString(referenceTime, "%Y. gada %d. %B", std::locale("lv_LV.UTF-8")) ==
+  //            "2014. gada 29. Janvāris");
+  BOOST_TEST(toString(referenceTime, "%Y -- %d -- %B", std::locale("C")) == "2014 -- 29 -- January");
 
   BOOST_TEST(fromIsoString("20140129T034247.032000") == referenceTime);
   BOOST_TEST(fromIsoString("20140129T034247.032000Z") == referenceTime);
@@ -110,10 +113,10 @@
   BOOST_TEST(fromString("2014-01-29 03:42:47") == fromUnixTimestamp(1390966967_s));
 
   // Unfortunately, not all systems has lv_LV locale installed :(
-  // BOOST_CHECK_EQUAL(fromString("2014. gada 29. Janvāris", "%Y. gada %d. %B", std::locale("lv_LV.UTF-8")),
-  //                   fromUnixTimestamp(1390953600_s));
-  BOOST_CHECK_EQUAL(fromString("2014 -- 29 -- January", "%Y -- %d -- %B", std::locale("C")),
-                    fromUnixTimestamp(1390953600_s));
+  // BOOST_TEST(fromString("2014. gada 29. Janvāris", "%Y. gada %d. %B", std::locale("lv_LV.UTF-8")) ==
+  //            fromUnixTimestamp(1390953600_s));
+  BOOST_TEST(fromString("2014 -- 29 -- January", "%Y -- %d -- %B", std::locale("C")) ==
+             fromUnixTimestamp(1390953600_s));
 }
 
 BOOST_AUTO_TEST_CASE(SteadyClock)