diff --git a/swmm-toolkit/src/swmm/toolkit/output.i b/swmm-toolkit/src/swmm/toolkit/output.i
index 1d43bbcd..1daff53e 100644
--- a/swmm-toolkit/src/swmm/toolkit/output.i
+++ b/swmm-toolkit/src/swmm/toolkit/output.i
@@ -61,13 +61,20 @@ and return a (possibly) different pointer */
 
 %apply int *OUTPUT {
     int *version,
-    int *time
+    int *time,
+    int *year, 
+    int *month, 
+    int *day,
+    int *hour, 
+    int *minute, 
+    int *second, 
+    int *dayOfWeek
 }
 
 %cstring_output_allocate_size(char **elementName, int *size, SMO_freeMemory(*$1));
 
 
-/* TYPEMAPS FOR MEMORY MANAGEMNET OF FLOAT ARRAYS */
+/* TYPEMAPS FOR MEMORY MANAGEMENT OF FLOAT ARRAYS */
 %typemap(in, numinputs=0)float **float_out (float *temp), int *int_dim (int temp){
    $1 = &temp;
 }
@@ -84,6 +91,23 @@ and return a (possibly) different pointer */
 }
 
 
+/* TYPEMAPS FOR MEMORY MANAGEMENT OF DOUBLE ARRAYS */
+%typemap(in, numinputs=0)double **double_out (double *temp), int *int_dim (int temp){
+   $1 = &temp;
+}
+%typemap(argout) (double **double_out, int *int_dim) {
+    if (*$1) {
+      PyObject *o = PyList_New(*$2);
+      double* temp = *$1;
+      for(int i=0; i<*$2; i++) {
+        PyList_SetItem(o, i, PyFloat_FromDouble((double)temp[i]));
+      }
+      $result = SWIG_AppendOutput($result, o);
+      SMO_freeMemory(*$1);
+    }
+}
+
+
 /* TYPEMAPS FOR MEMORY MANAGEMENT OF INT ARRAYS */
 %typemap(in, numinputs=0)int **int_out (int *temp), int *int_dim (int temp){
     $1 = &temp;
@@ -151,6 +175,8 @@ and return a (possibly) different pointer */
 %ignore SMO_clearError;
 %ignore SMO_checkError;
 
+%noexception SMO_decodeDate;
+
 %include "swmm_output.h"
 
 %exception;
diff --git a/swmm-toolkit/src/swmm/toolkit/output_rename.i b/swmm-toolkit/src/swmm/toolkit/output_rename.i
index b3566514..d75a03b2 100644
--- a/swmm-toolkit/src/swmm/toolkit/output_rename.i
+++ b/swmm-toolkit/src/swmm/toolkit/output_rename.i
@@ -20,6 +20,10 @@
 %rename(get_times)              SMO_getTimes;
 %rename(get_elem_name)          SMO_getElementName;
 
+%rename(get_date_time)          SMO_getDateTime;
+%rename(get_date_series)        SMO_getDateSeries;
+%rename(decode_date)            SMO_decodeDate;
+
 %rename(get_subcatch_series)    SMO_getSubcatchSeries;
 %rename(get_node_series)        SMO_getNodeSeries;
 %rename(get_link_series)        SMO_getLinkSeries;
diff --git a/swmm-toolkit/swmm-solver b/swmm-toolkit/swmm-solver
index 9d7a3f9f..ebbce382 160000
--- a/swmm-toolkit/swmm-solver
+++ b/swmm-toolkit/swmm-solver
@@ -1 +1 @@
-Subproject commit 9d7a3f9f2b9bbf34b663c74088640e99caec5b38
+Subproject commit ebbce382c46876e701a3c47cb73684fdbe005e21
diff --git a/swmm-toolkit/tests/test_output.py b/swmm-toolkit/tests/test_output.py
index b1f4954c..5edbf893 100644
--- a/swmm-toolkit/tests/test_output.py
+++ b/swmm-toolkit/tests/test_output.py
@@ -85,6 +85,65 @@ def test_getelementname(handle):
     assert output.get_elem_name(handle, shared_enum.ElementType.NODE, 1) == "10"
 
 
+
+def test_getdatetime(handle):
+    date0 = output.get_date_time(handle, 0)
+    date1 = output.get_date_time(handle, 1)
+    assert isinstance(date0, (float, np.floating))
+
+    step_seconds = output.get_times(handle, shared_enum.Time.REPORT_STEP)
+    step_days = step_seconds / 86400.0
+
+    # consecutive timestamps differ by exactly one report step (in days)
+    assert np.isclose(date1 - date0, step_days)
+
+    # first timestamp should be strictly after the saved start date anchor
+    assert date0 > output.get_start_date(handle)
+
+
+def test_getdateseries(handle):
+    start, end = 0, 5
+    dates = output.get_date_series(handle, start, end)
+
+    assert len(dates) == end - start + 1
+
+    step_days = output.get_times(handle, shared_enum.Time.REPORT_STEP) / 86400.0
+    diffs = np.diff(dates)
+
+    # monotonic and evenly spaced by report step
+    assert np.allclose(diffs, step_days)
+    assert np.isclose(dates[-1], dates[0] + (end - start) * step_days)
+
+
+def test_decodedate(handle):
+    # decoded components are plausible
+    date0 = output.get_date_time(handle, 0)
+    y, m, d, hh, mm, ss, dow = output.decode_date(date0)
+
+    assert 1 <= m <= 12
+    assert 1 <= d <= 31
+    assert 0 <= hh <= 23
+    assert 0 <= mm <= 59
+    assert 0 <= ss <= 59
+    assert 1 <= dow <= 7
+
+    # consecutive decode respects the report step
+    date1 = output.get_date_time(handle, 1)
+    y1, m1, d1, hh1, mm1, ss1, dow1 = output.decode_date(date1)
+
+    step_seconds = output.get_times(handle, shared_enum.Time.REPORT_STEP)
+    step_hours = (step_seconds // 3600) % 24
+
+    # minutes/seconds remain constant for steps divisible by 60s
+    if step_seconds % 60 == 0:
+        assert mm1 == mm
+        assert ss1 == ss
+
+    # hour advances by step_hours modulo 24 (day rollover allowed)
+    assert ((hh1 - hh) % 24) == step_hours
+
+
+
 def test_getsubcatchseries(handle):
 
     ref_array = np.array([0.0,
diff --git a/swmm-toolkit/tests/test_series.py b/swmm-toolkit/tests/test_series.py
new file mode 100644
index 00000000..71187b94
--- /dev/null
+++ b/swmm-toolkit/tests/test_series.py
@@ -0,0 +1,160 @@
+from datetime import datetime, timedelta
+import os
+import pytest
+from swmm.toolkit import solver, output, shared_enum
+
+DATA_PATH = os.path.join(os.path.abspath(os.path.dirname(__file__)), "data")
+INPUT_FILE = os.path.join(DATA_PATH, "test_Example1.inp")
+REPORT_FILE = os.path.join(DATA_PATH, "temp_align.rpt")
+OUTPUT_FILE = os.path.join(DATA_PATH, "temp_align.out")
+
+REPORT_STEP_SECONDS = 3600  # Example1
+
+
+def _correct_decimal_digits(t, r):
+    """
+    Correct Decimal Digits (CDD) is computed as a bounded form of
+    ``-log10(abs(test_value - ref_value))``, which approximates how many 
+    decimal digits of ``test_value`` agree with ``ref_value``. 
+    """
+    import math
+
+    if t == r:
+        return 10.0
+
+    tmp = abs(t - r)
+    if tmp < 1.0e-7:
+        tmp = 1.0e-7
+    elif tmp > 2.0:
+        tmp = 1.0
+
+    tmp = -math.log10(tmp)
+    if tmp < 0.0:
+        tmp = 0.0
+
+    return tmp
+
+
+def check_cdd_float(test: list[float], ref: list[float], cdd_tol: int) -> bool:
+    """
+    Check the minimum number of correct decimal digits (CDD) between two 
+    float sequences. This function finds the minimum CDD over all element 
+    pairs in ``test`` and ``ref``, then checks whether ``floor(min_cdd)`` 
+    is greater than or equal to ``cdd_tol``.
+
+    Parameters
+    ----------
+    test : list[float]
+        Sequence of test values to be compared.
+    ref : list[float]
+        Sequence of reference values used as the expected results.
+    cdd_tol : int
+        Required minimum number of correct decimal digits (integer threshold)
+        that the minimum CDD over all pairs must meet or exceed.
+    
+    Returns
+    -------
+    bool
+        ``True`` if ``test`` and ``ref`` have the same length and
+        ``floor(min_cdd) >= cdd_tol``; ``False`` otherwise (including if the
+        sequences differ in length).
+    """
+    import math
+
+    if len(test) != len(ref):
+        return False
+    
+    min_cdd = 10.0
+
+    for t, r in zip(test, ref):
+        tmp = _correct_decimal_digits(t, r)
+
+        if tmp < min_cdd:
+            min_cdd = tmp
+
+    return math.floor(min_cdd) >= cdd_tol
+
+
+def _get_current_datetime():
+    y, m, d, hh, mm, ss = solver.simulation_get_current_datetime()
+    return datetime(y, m, d, hh, mm, ss)
+
+def build_link_flow_solver_tuples_aligned():
+    tuples = []
+    solver.swmm_open(INPUT_FILE, REPORT_FILE, OUTPUT_FILE)
+    try:
+        solver.swmm_start(0)
+        # After start callback
+        # period_end = _get_current_datetime
+        # value = solver.link_get_result(0, shared_enum.LinkResult.FLOW)
+        # tuples.append((period_end, value))
+
+        while True:
+            # Before step callback
+            #
+            time_left = solver.swmm_stride(REPORT_STEP_SECONDS)
+            # After step callback
+            #
+            if time_left == 0:
+                break
+            # Value for the interval that just ended; align to its period-end timestamp
+            period_end = _get_current_datetime() - timedelta(seconds=REPORT_STEP_SECONDS)
+            value = solver.link_get_result(0, shared_enum.LinkResult.FLOW)
+            tuples.append((period_end, value))
+
+        # Before end callback
+        period_end = _get_current_datetime() - timedelta(seconds=REPORT_STEP_SECONDS)
+        value = solver.link_get_result(0, shared_enum.LinkResult.FLOW)
+        tuples.append((period_end, value))
+
+        solver.swmm_end()
+        # After end callback
+        #
+
+    finally:
+        solver.swmm_close()
+        # After close callback
+        #
+    return tuples
+
+def build_link_flow_output_tuples():
+    EPOCH_SWMM = datetime(1899, 12, 30)
+    h = output.init()
+    output.open(h, os.path.join(DATA_PATH, "test_Example1.out"))
+    try:
+        start_days = output.get_start_date(h)
+        rpt = output.get_times(h, shared_enum.Time.REPORT_STEP)
+        n = output.get_times(h, shared_enum.Time.NUM_PERIODS)
+        start_dt = EPOCH_SWMM + timedelta(days=start_days)
+        vals = output.get_link_series(h, 0, shared_enum.LinkAttribute.FLOW_RATE, 0, n - 1)
+        tuples = [(start_dt + timedelta(seconds=i * rpt), float(vals[i])) for i in range(n)]
+    finally:
+        output.close(h)
+    return tuples
+
+def test_compare_aligned_series():
+    s = build_link_flow_solver_tuples_aligned()
+    o = build_link_flow_output_tuples()
+
+    # times must match
+    solver_times = [t.strftime("%Y-%m-%d %H:%M:%S") for t, _ in s]
+    output_times = [t.strftime("%Y-%m-%d %H:%M:%S") for t, _ in o]
+    assert solver_times == output_times, (
+        "Time axes differ.\n"
+        f"Solver times: {solver_times[:5]} ...\n"
+        f"Output times: {output_times[:5]} ..."
+    )
+
+    # values should match within tolerance
+    solver_vals = [v for _, v in s]
+    output_vals = [v for _, v in o]
+
+    assert check_cdd_float(solver_vals, output_vals, 1), (
+        "Solver and output values differ. "
+        "See zipped output for details:\n" +
+        "\n".join(
+            f"{t1.strftime('%Y-%m-%d %H:%M:%S')} | {v1:.6f} || {t2.strftime('%Y-%m-%d %H:%M:%S')} | {v2:.6f} | cdd={cdd(v1, v2):.2f}"
+            for (t1, v1), (t2, v2) in list(zip(s, o))[:10]
+        )
+    )
+