fix: date picker timezone bias

internal/db/stats.go

···
 		return 0, nil
 	}
 
+	// TODO: This should be calculated in users timezone.
 	now := time.Now().UTC()
 	today := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, time.UTC)
 	yesterday := today.AddDate(0, 0, -1)

internal/server/views/edit-study-session.templ

···
 					</div>
 					<div
 						x-data="{
-                            today: (d => d.toISOString().slice(0,10))(new Date()),
-                            oneYearAgo: (d => d.toISOString().slice(0,10))(new Date(new Date().setFullYear(new Date().getFullYear() - 1)))
+                            today: () => {
+                                let date = new Date();
+                                return new Date(date.getTime() - (date.getTimezoneOffset() * 60000)).toISOString().slice(0,10);
+                            },
+                            oneYearAgo: () => {
+                                let date = new Date(new Date().setFullYear(new Date().getFullYear() - 1));
+                                return new Date(date.getTime() - (date.getTimezoneOffset() * 60000)).toISOString().slice(0,10);
+                            },
                         }"
 						class="flex flex-col gap-2"
 					>

internal/server/views/new-study-session.templ

···
 					</div>
 					<div
 						x-data="{
-                            today: (d => d.toISOString().slice(0,10))(new Date()),
-                            oneYearAgo: (d => d.toISOString().slice(0,10))(new Date(new Date().setFullYear(new Date().getFullYear() - 1)))
+                            today: () => {
+                                let date = new Date();
+                                return new Date(date.getTime() - (date.getTimezoneOffset() * 60000)).toISOString().slice(0,10);
+                            },
+                            oneYearAgo: () => {
+                                let date = new Date(new Date().setFullYear(new Date().getFullYear() - 1));
+                                return new Date(date.getTime() - (date.getTimezoneOffset() * 60000)).toISOString().slice(0,10);
+                            },
                         }"
 						x-show="mode === 'manual'"
 						x-transition