diff --git a/openssl-sys/src/asn1.rs b/openssl-sys/src/asn1.rs
index 90eaeffab754d1247c9337db6257d71fd22be763..042b3eca8324c6362be62a421441d8f1da3f3c60 100644
--- a/openssl-sys/src/asn1.rs
+++ b/openssl-sys/src/asn1.rs
@@ -38,6 +38,7 @@ extern "C" {
 
     pub fn ASN1_GENERALIZEDTIME_free(tm: *mut ASN1_GENERALIZEDTIME);
     pub fn ASN1_GENERALIZEDTIME_print(b: *mut BIO, tm: *const ASN1_GENERALIZEDTIME) -> c_int;
+    pub fn ASN1_TIME_new() -> *mut ASN1_TIME;
     pub fn ASN1_TIME_free(tm: *mut ASN1_TIME);
     pub fn ASN1_TIME_print(b: *mut BIO, tm: *const ASN1_TIME) -> c_int;
 
@@ -46,6 +47,10 @@ extern "C" {
     pub fn ASN1_INTEGER_set(dest: *mut ASN1_INTEGER, value: c_long) -> c_int;
     pub fn BN_to_ASN1_INTEGER(bn: *const BIGNUM, ai: *mut ASN1_INTEGER) -> *mut ASN1_INTEGER;
     pub fn ASN1_INTEGER_to_BN(ai: *const ASN1_INTEGER, bn: *mut BIGNUM) -> *mut BIGNUM;
+
+    pub fn ASN1_TIME_set_string(s: *mut ASN1_TIME, str: *const c_char) -> c_int;
+    #[cfg(ossl111)]
+    pub fn ASN1_TIME_set_string_X509(s: *mut ASN1_TIME, str: *const c_char) -> c_int;
 }
 
 cfg_if! {
diff --git a/openssl/src/asn1.rs b/openssl/src/asn1.rs
index 6b720dca984939e5c638559664db98ee181170b2..911f3462dc9fe38332fd5c34bd1f9836e53e0765 100644
--- a/openssl/src/asn1.rs
+++ b/openssl/src/asn1.rs
@@ -27,6 +27,7 @@
 use ffi;
 use foreign_types::{ForeignType, ForeignTypeRef};
 use libc::{c_char, c_int, c_long};
+use std::ffi::CString;
 use std::fmt;
 use std::ptr;
 use std::slice;
@@ -105,6 +106,15 @@ impl fmt::Display for Asn1TimeRef {
 }
 
 impl Asn1Time {
+    fn new() -> Result<Asn1Time, ErrorStack> {
+        ffi::init();
+
+        unsafe {
+            let handle = cvt_p(ffi::ASN1_TIME_new())?;
+            Ok(Asn1Time::from_ptr(handle))
+        }
+    }
+
     fn from_period(period: c_long) -> Result<Asn1Time, ErrorStack> {
         ffi::init();
 
@@ -118,6 +128,41 @@ impl Asn1Time {
     pub fn days_from_now(days: u32) -> Result<Asn1Time, ErrorStack> {
         Asn1Time::from_period(days as c_long * 60 * 60 * 24)
     }
+
+    /// Creates a new time corresponding to the specified ASN1 time string.
+    ///
+    /// This corresponds to [`ASN1_TIME_set_string`].
+    ///
+    /// [`ASN1_TIME_set_string`]: https://www.openssl.org/docs/manmaster/man3/ASN1_TIME_set_string.html
+    pub fn from_str(s: &str) -> Result<Asn1Time, ErrorStack> {
+        unsafe {
+            let s = CString::new(s).unwrap();
+
+            let time = Asn1Time::new()?;
+            cvt(ffi::ASN1_TIME_set_string(time.as_ptr(), s.as_ptr()))?;
+
+            Ok(time)
+        }
+    }
+
+    /// Creates a new time corresponding to the specified X509 time string.
+    ///
+    /// This corresponds to [`ASN1_TIME_set_string_X509`].
+    ///
+    /// Requires OpenSSL 1.1.1 or newer.
+    ///
+    /// [`ASN1_TIME_set_string`]: https://www.openssl.org/docs/manmaster/man3/ASN1_TIME_set_string.html
+    #[cfg(ossl111)]
+    pub fn from_str_x509(s: &str) -> Result<Asn1Time, ErrorStack> {
+        unsafe {
+            let s = CString::new(s).unwrap();
+
+            let time = Asn1Time::new()?;
+            cvt(ffi::ASN1_TIME_set_string_X509(time.as_ptr(), s.as_ptr()))?;
+
+            Ok(time)
+        }
+    }
 }
 
 foreign_type_and_impl_send_sync! {
@@ -339,4 +384,11 @@ mod tests {
         roundtrip(BigNum::from_u32(1234).unwrap());
         roundtrip(-BigNum::from_u32(1234).unwrap());
     }
+
+    #[test]
+    fn time_from_str() {
+        Asn1Time::from_str("99991231235959Z").unwrap();
+        #[cfg(ossl111)]
+        Asn1Time::from_str_x509("99991231235959Z").unwrap();
+    }
 }