diff --git a/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_a_description_is_html_code_event_link_with_allday_flag__1.txt b/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_a_description_is_html_code_event_link_with_allday_flag__1.txt
index b18c4a8..505d91b 100644
--- a/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_a_description_is_html_code_event_link_with_allday_flag__1.txt
+++ b/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_a_description_is_html_code_event_link_with_allday_flag__1.txt
@@ -4,9 +4,9 @@ PRODID:Spatie calendar-links
 BEGIN:VEVENT
 UID:9fc99e4f3dcee13f23355d63918b9a0c
 SUMMARY:Birthday Party +1
-DTSTAMP:20180201T090000
-DTSTART:20180201T090000
-DTEND:20180201T180000
+DTSTAMP:20180201T090000Z
+DTSTART:20180201T090000Z
+DTEND:20180201T180000Z
 DESCRIPTION:With balloons\, clowns and stuff\nBring a dog\, bring a frog.\nThere will be line breaks on it.\nProject link calendar-links\n\n\nThank you.\n
 LOCATION:Party Lane 1A\, 1337 Funtown
 END:VEVENT
diff --git a/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_a_multiple_days_event_link__1.txt b/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_a_multiple_days_event_link__1.txt
index e92486d..b0ad625 100644
--- a/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_a_multiple_days_event_link__1.txt
+++ b/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_a_multiple_days_event_link__1.txt
@@ -4,9 +4,9 @@ PRODID:Spatie calendar-links
 BEGIN:VEVENT
 UID:2009a227b7dd438a285434127f67f267
 SUMMARY:New Year
-DTSTAMP:20191231T230000
-DTSTART:20191231T230000
-DTEND:20200101T010000
+DTSTAMP:20191231T230000Z
+DTSTART:20191231T230000Z
+DTEND:20200101T010000Z
 DESCRIPTION:With balloons\, clowns and stuff\nBring a dog\, bring a frog
 LOCATION:Party Lane 1A\, 1337 Funtown
 END:VEVENT
diff --git a/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_a_short_event_link__1.txt b/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_a_short_event_link__1.txt
index e025fa8..e0bd621 100644
--- a/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_a_short_event_link__1.txt
+++ b/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_a_short_event_link__1.txt
@@ -4,9 +4,9 @@ PRODID:Spatie calendar-links
 BEGIN:VEVENT
 UID:94ab75add84a67c019eae57539658036
 SUMMARY:Birthday
-DTSTAMP:20180201T090000
-DTSTART:20180201T090000
-DTEND:20180201T180000
+DTSTAMP:20180201T090000Z
+DTSTART:20180201T090000Z
+DTEND:20180201T180000Z
 DESCRIPTION:With balloons\, clowns and stuff\nBring a dog\, bring a frog
 LOCATION:Party Lane 1A\, 1337 Funtown
 END:VEVENT
diff --git a/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_an_ics_link_with_custom_uid__1.txt b/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_an_ics_link_with_custom_uid__1.txt
index 59d1cc3..a451c8e 100644
--- a/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_an_ics_link_with_custom_uid__1.txt
+++ b/tests/Generators/__snapshots__/IcsGeneratorTest__it_can_generate_an_ics_link_with_custom_uid__1.txt
@@ -4,9 +4,9 @@ PRODID:Spatie calendar-links
 BEGIN:VEVENT
 UID:random-uid
 SUMMARY:Birthday
-DTSTAMP:20180201T090000
-DTSTART:20180201T090000
-DTEND:20180201T180000
+DTSTAMP:20180201T090000Z
+DTSTART:20180201T090000Z
+DTEND:20180201T180000Z
 DESCRIPTION:With balloons\, clowns and stuff\nBring a dog\, bring a frog
 LOCATION:Party Lane 1A\, 1337 Funtown
 END:VEVENT
diff --git a/tests/Generators/__snapshots__/IcsGeneratorTest__it_has_a_product_dtstamp__1.txt b/tests/Generators/__snapshots__/IcsGeneratorTest__it_has_a_product_dtstamp__1.txt
index e025fa8..e0bd621 100644
--- a/tests/Generators/__snapshots__/IcsGeneratorTest__it_has_a_product_dtstamp__1.txt
+++ b/tests/Generators/__snapshots__/IcsGeneratorTest__it_has_a_product_dtstamp__1.txt
@@ -4,9 +4,9 @@ PRODID:Spatie calendar-links
 BEGIN:VEVENT
 UID:94ab75add84a67c019eae57539658036
 SUMMARY:Birthday
-DTSTAMP:20180201T090000
-DTSTART:20180201T090000
-DTEND:20180201T180000
+DTSTAMP:20180201T090000Z
+DTSTART:20180201T090000Z
+DTEND:20180201T180000Z
 DESCRIPTION:With balloons\, clowns and stuff\nBring a dog\, bring a frog
 LOCATION:Party Lane 1A\, 1337 Funtown
 END:VEVENT
diff --git a/tests/Generators/__snapshots__/IcsGeneratorTest__it_has_a_product_id__1.txt b/tests/Generators/__snapshots__/IcsGeneratorTest__it_has_a_product_id__1.txt
index e025fa8..e0bd621 100644
--- a/tests/Generators/__snapshots__/IcsGeneratorTest__it_has_a_product_id__1.txt
+++ b/tests/Generators/__snapshots__/IcsGeneratorTest__it_has_a_product_id__1.txt
@@ -4,9 +4,9 @@ PRODID:Spatie calendar-links
 BEGIN:VEVENT
 UID:94ab75add84a67c019eae57539658036
 SUMMARY:Birthday
-DTSTAMP:20180201T090000
-DTSTART:20180201T090000
-DTEND:20180201T180000
+DTSTAMP:20180201T090000Z
+DTSTART:20180201T090000Z
+DTEND:20180201T180000Z
 DESCRIPTION:With balloons\, clowns and stuff\nBring a dog\, bring a frog
 LOCATION:Party Lane 1A\, 1337 Funtown
 END:VEVENT