Bug 798625 - "Last up through report date" changed in 4.12

Don't adjust report dates with time64CanonicalDayTime. They're set
to 23:59:59 local which is always >= neutral time at which prices
and transactions are timestamped. Local noon is before neutral time for
all time zones east of UTC+2.

gnucash/report/commodity-utilities.scm

@@ -739,7 +739,7 @@
              (gnc-pricedb-get-db (gnc-get-current-book))
              (gnc:gnc-monetary-amount foreign)
              (gnc:gnc-monetary-commodity foreign)
-             domestic (time64CanonicalDayTime date))))))
+             domestic date)))))
 
 (define (gnc:exchange-by-pricedb-nearest-before foreign domestic date)
   (and (gnc:gnc-monetary? foreign) date
@@ -751,7 +751,7 @@
              (gnc-pricedb-get-db (gnc-get-current-book))
              (gnc:gnc-monetary-amount foreign)
              (gnc:gnc-monetary-commodity foreign)
-             domestic (time64CanonicalDayTime date))))))
+             domestic date)))))
 
 ;; Exchange by the nearest price from pricelist. This function takes
 ;; the <gnc-monetary> 'foreign' amount, the <gnc:commodity*>
@@ -817,9 +817,9 @@
   (define pdb (gnc-pricedb-get-db (gnc-get-current-book)))
   (case source
     ((pricedb-nearest) (cut gnc-pricedb-get-nearest-price pdb <> target-curr
-                            (time64CanonicalDayTime date)))
+                            date))
     ((pricedb-before) (cut gnc-pricedb-get-nearest-before-price pdb <> target-curr
-                           (time64CanonicalDayTime date)))
+                           date))
     ((pricedb-latest)  (cut gnc-pricedb-get-latest-price pdb <> target-curr))
     (else
      (lambda (commodity)

gnucash/report/trep-engine.scm

@@ -1316,17 +1316,13 @@ be excluded from periodic reporting.")
                                              (opt-val pagename-currency
                                                       optname-currency)))
                                     ""))))
-           ;; For conversion to row-currency. Use midday as the
-           ;; transaction time so it matches a price on the same day.
-           ;; Otherwise it uses midnight which will likely match a
-           ;; price on the previous day
+           ;; For conversion to row-currency.
            (converted-amount (lambda (s)
                                (exchange-fn
                                 (gnc:make-gnc-monetary (split-currency s)
                                                        (split-amount s))
                                 (row-currency s)
-                                (time64CanonicalDayTime
-                                 (xaccTransGetDate (xaccSplitGetParent s))))))
+                                (xaccTransGetDate (xaccSplitGetParent s)))))
            (converted-debit-amount (lambda (s) (and (positive? (split-amount s))
                                                     (converted-amount s))))
            (converted-credit-amount (lambda (s)