1diff --git a/src/RawFormulas/Date.ts b/src/RawFormulas/Date.ts
 2index dd4c79e..f64f2e8 100644
 3--- a/src/RawFormulas/Date.ts
 4+++ b/src/RawFormulas/Date.ts
 5@@ -136,7 +136,7 @@ var DATEVALUE = function (...values) : number {
 6   var dateString = TypeCaster.firstValueAsString(values[0]);
 7   var m;
 8 
 9-  // Check YEAR_MONTHDIG_DAY_SLASH_DELIMIT, YYYY/MM/DD, 1992/06/24
10+  // Check YEAR_MONTHDIG_DAY_SLASH_DELIMIT, YYYY/MM/DD, "1992/06/24"
11   if (m === undefined) {
12     // For reference: https://regex101.com/r/uusfi7/5
13     const REG = DateRegExBuilder.DateRegExBuilder()
14@@ -165,7 +165,7 @@ var DATEVALUE = function (...values) : number {
15     }
16   }
17 
18-  // Check MONTHDIG_DAY_YEAR_SLASH_DELIMIT, MM/DD/YY(YY), 06/24/1992 or 06/24/92
19+  // Check MONTHDIG_DAY_YEAR_SLASH_DELIMIT, MM/DD/YY(YY), "06/24/1992" or "06/24/92"
20   if (m === undefined) {
21     // For reference: https://regex101.com/r/yHraci/5
22     const REG = DateRegExBuilder.DateRegExBuilder()
23@@ -194,10 +194,15 @@ var DATEVALUE = function (...values) : number {
24     }
25   }
26 
27-  // Check YYYY/MM/DD HH(am|pm)
28+  // Check YEAR_MONTHDIG_DAY_SLASH_DELIMIT_WITH_HOUR_MERIDIEM, YYYY/MM/DD HH(am|pm), "1992/06/24 12pm"
29   if (m === undefined) {
30     // For reference: https://regex101.com/r/m8FSCr/6
31-    var matches = dateString.match(/^\s*(([0-9][0-9][0-9][0-9])|([1-9][0-9][0-9]))\/([1-9]|0[1-9]|1[0-2])\/([1-9]|[0-2][0-9]|3[0-1])\s*([0-9]|0[0-9]|1[0-2])\s*(am|pm)\s*$/i);
32+    const REG = DateRegExBuilder.DateRegExBuilder()
33+      .start()
34+      .YYYY().SLASH_DELIMITOR().MM().SLASH_DELIMITOR().DD().zeroOrMoreSpaces().HH().MERIDIEM()
35+      .end()
36+      .build();
37+    var matches = dateString.match(REG);
38     if (matches && matches.length === 8) {
39       var years = parseInt(matches[1]);
40       var months = parseInt(matches[4]) - 1; // Months are zero indexed.
41diff --git a/src/RawFormulas/Utils.ts b/src/RawFormulas/Utils.ts
42index 62a3500..187537d 100644
43--- a/src/RawFormulas/Utils.ts
44+++ b/src/RawFormulas/Utils.ts
45@@ -451,12 +451,30 @@ class DateRegExBuilder {
46     return this;
47   }
48 
49+  /**
50+   *
51+   * @returns {DateRegExBuilder}
52+   * @constructor
53+   */
54+  HH(): DateRegExBuilder {
55+    this.regexString += "([0-9]|0[0-9]|1[0-2])";
56+    return this;
57+  }
58+
59+  MERIDIEM(): DateRegExBuilder {
60+    this.regexString += "(am|pm)";
61+    return this;
62+  }
63+
64+
65+
66   /**
67    * Builds the regular expression.
68    * @returns {RegExp} Built up string as a regular expression.
69    */
70   build() : RegExp {
71-    return new RegExp(this.regexString);
72+    // Always ignore case.
73+    return new RegExp(this.regexString, 'i');
74   }
75 }
76